eduagarcia/scielo_abstracts · Datasets at Hugging Face

scl/1516-1439/S1516-14392022000100213.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100213

10.1590/1980-5373-mr-2021-0179

ENGINEERING, CHEMICAL

Universidade Federal de Uberlândia

null

Tribocorrosion in Ferritic Stainless Steels: an Improved Methodological Approach

Abreu, D.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract This study aimed to improve a potentiodynamic-based methodological approach for characterising the tribocorrosion of ferritic stainless steel. Synergistic effects in tribocorrosion systems have been widely investigated and debated under potentiostatic conditions. Because potentiostatic tests can ignore essential phenomena that are typically noticeable in potentiodynamic tests (potential scanning), such as variations in the friction coefficient that are motivated by potential scanning, e.g., during active, passive, and transpassive domains, a potentiodynamic-technique-based methodology was enhanced to analyse tribocorrosion in ferritic stainless steels. The proposed method facilitates the analysis of all essential parameters for tribocorrosion phenomena based on a single figure directly associating the average friction coefficient curves from sliding tests and tribocorrosion tests. It consists of performing sliding tribological tests to evaluate mechanical wear accurately, potentiodynamic corrosion tests to determine corrosion resistance in the absence of mechanical wear, and tribocorrosion tests to associate mechanical wear and corrosion degradation caused by chemical/electrochemical effects. Validation of the methodology consisted of its application to an 11% Cr ferritic stainless steel. The results demonstrate that tribocorrosion intensifies the material loss, but only by a minimal amount. The results demonstrate that the average passivation current density in the tribocorrosive tests was significantly higher. Apparently, the corrosion products generated during the tribocorrosion tests acted as solid lubricants inducing a lower friction coefficient in the tribocorrosive tests. Finally, tribocorrosion intensifies the material loss, but only by a minimal amount.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100213&lng=en&tlng=en

25

scielo_articles/scl/1516-1439/S1516-14392022000100213.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Abreu, D.", "Silva Jr., W.M.", "Ardila, M.A.N.", "de Mello, J.D.B." ]

null

[ "Tribocorrosion", "potentiodynamic", "ferritic stainless steels", "methodological approach", "sliding wear" ]

null

[ "Universidade Federal de Uberlândia" ]

scl/1516-1439/S1516-14392022000100212.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100212

10.1590/1980-5373-mr-2021-0315

ENGINEERING, CHEMICAL

Universidade Federal do Vale do São Francisco

null

Development of a β-LiAlSi2O6:Cr-based Ceramic Pigment by Proteic Sol-Gel Process Using Gelatin: Synthesis and Characterization

Ferraz, Ricardo Ferrari

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract A novel pigment of β-LiAlSi2O6:Cr ceramic was developed by a partial proteic sol-gel process, using gelatin as a ligand. X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and visible and near-infrared diffuse reflectance spectroscopy (vis-NIR DRS) were performed. XRD results confirmed that the crystal structure of the lattice corresponded to β-LiAlSi2O6 (or β‑spodumene), and the addition Cr3+ ions by doping did not interfere in the formation of this crystalline phase. EDS confirmed the homogeneous existence of Cr3+ dopant in β‑LiAlSi2O6 particles. From the vis‑NIR DRS, selective absorption of visible light wavelengths was identified in the bands of 425 nm and 600 nm, resulting in the perception of a yellowish-green color when β-LiAlSi2O6 is doped with Cr3+. CIE-XYZ colorimetric coordinates were generated to characterize the resulting colors. The obtained results demonstrated the viability of β‑LiAlSi2O6:Cr synthesis by a proteic sol‑gel route and its great potential for obtaining a yellowish-green ceramic pigment.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100212&lng=en&tlng=en

39

scielo_articles/scl/1516-1439/S1516-14392022000100212.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Ferraz, Ricardo Ferrari", "Sousa, Jaine Ferreira", "Costa, Daniel dos Santos", "Oliveira, Raquel Aline Pessoa", "Lima, Héstia Raissa Batista Reis" ]

null

[ "proteic sol-gel process", "gelatin", "β-spodumene", "ceramic pigment" ]

null

[ "Universidade Federal do Vale do São Francisco", "Instituto Federal de Sergipe" ]

scl/1516-1439/S1516-14392022000100211.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100211

10.1590/1980-5373-mr-2021-0235

ENGINEERING, CHEMICAL

Universidade Estadual Paulista

null

Stress Concentration in Open Hole Laminate Composites Under Bending: Potential Application in Dental Implant Prosthesis

Alves, Harlei Augusto Bueno

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Carbon fiber reinforced polymer (CFRP) have been gaining prominence in replacing metallic alloys for infrastructure in prostheses, with the possibility of edentulous patients to acquire fixed prostheses. For this, procedures are required to connect these implants to the implant-supported fixed prosthesis, such as holes and notches that can reduce their mechanical properties. In addition, the infrastructure requires longer cantilevers, causing greater stress on the prosthetic system. Then, the objective is to analyze the stress concentration in the CFRP subjected to bending loads with holes (4 and 6 mm diameter to verify the influence of the diameter-to-width ratio) in four-point-bending test. Two composite laminates were evaluated: one with thermoplastic matrix of poly(phenylene sulphide) PPS; and another with epoxy matrix combined with carbon fibers fabric. The presence of holes in the studied dimensions did not present significant differences in the flexural modulus and maximum bending strength. Therefore, the use of CFRP showed some advantage regarding the reduced effect of stress concentration compared to metallic alloys.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100211&lng=en&tlng=en

75

scielo_articles/scl/1516-1439/S1516-14392022000100211.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Alves, Harlei Augusto Bueno", "Monticeli, Francisco Maciel", "Lobo, Carolina Machado Martinelli", "Shiino, Marcos Yutaka" ]

null

[ "buckling", "fracture", "bending moment", "residual strength", "dental prosthesis" ]

null

[ "Universidade Estadual Paulista", "Universidade Estadual Paulista", "Universidade Estadual Paulista" ]

scl/1516-1439/S1516-14392022000100210.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100210

10.1590/1980-5373-mr-2021-0220

ENGINEERING, CHEMICAL

Universidade Federal de Minas Gerais

null

Design of a Tribo-Simulator for Investigation of the Tribological Behavior of Stainless-Steel Sheets Under Different Contact Conditions

Luiz, Valmir Dias

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract In sheet metal forming (SMF), deformation is caused by the relative movement between the sheet and tool, which generates friction forces. However, materials behave differently during plastic deformation. In this study, a tribo-simulator was designed to investigate the effect of different contact conditions or formability tests on the tribological behavior of AISI 304 and AISI 430 stainless-steel sheets. The effects of the texture and microstructure of the sheets on the measured coefficients of friction (COFs) and changes that occurred on the tribosurfaces also were investigated. Roughness and microhardness measurements, optical and scanning electron microscopy, and X-ray diffraction were used in the analyses. The tribo-simulator was successfully manufactured, and the repeatability of the measured COFs was satisfactory (standard deviation of ~0.02). A comparative analysis of the formability tests revealed differences in the COFs. In the bending under tension test, the COF for ferritic steel was 33% higher, while in the strip-tension test, the COF for austenitic steel was 44% higher. Friction was strongly influenced by the texture and microstructural characteristics of the steel sheets. The samples exhibited galling due to severe adhesive wear.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100210&lng=en&tlng=en

56

scielo_articles/scl/1516-1439/S1516-14392022000100210.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Luiz, Valmir Dias", "Rodrigues, Paulo César de Matos" ]

null

[ "Sheet metal forming", "AISI 304 and AISI 430 stainless-steel sheets", "Tribo-simulator", "Formability tests", "Coefficients of friction" ]

null

[ "Universidade Federal de Minas Gerais", "Centro Federal de Educação Tecnológica de Minas Gerais" ]

scl/1516-1439/S1516-14392022000100208.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100208

10.1590/1980-5373-mr-2020-0538

ENGINEERING, CHEMICAL

Instituto Federal do Espírito Santo

null

Electrical and Ferroelectric Properties of Undoped and Er-Doped PZT52/48 Electroceramics Synthesized by a Polymeric Precursor Method

Caceres, Jaime Alberto Sanchez

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

The effect of Er on the structural and electrical properties of doped PZT 52/48 ceramics has been studied in this work. The ferroelectric properties (permittivity, ferro-paraelectric phase transition and hysteresis) of such materials are thus found to be strongly dependent on the degree of densification and structural phase development during sintering at high temperatures. In particular, the nature of the ferroelectric to paraelectric phase transition is in these materials that can be represented through the Curie-Weiss Law equation modified, appropriate for the characterization diffuse transitions. The substitution of Er3+ for (Zr,Ti)4+ is found to induce strong diffuse phase transition in these materials. The electrical properties reported in this work are in magnitude comparable to those exhibited by PZT52/48 materials.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100208&lng=en&tlng=en

24

scielo_articles/scl/1516-1439/S1516-14392022000100208.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Caceres, Jaime Alberto Sanchez", "Passos, Carlos Augusto Cardoso" ]

null

[ ": PZT-based", "electrical properties", "ferroelectric", "dielectric properties" ]

null

[ "Instituto Federal do Espírito Santo", "Universidade Federal do Espírito Santo" ]

scl/1516-1439/S1516-14392022000100217.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100217

10.1590/1980-5373-mr-2021-0468

ENGINEERING, CHEMICAL

Easwari Engineering College

null

Experimental Investigations on µED Milling of Inconel 718 with Nano SiC Abrasive Mixed Dielectric

Elumalai, B.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Micro electro-discharge machining is one of the efficient processes to create three-dimensional micro features of metallic components for various applications. Powder mixed EDM improves the machining rate and reduces the surface roughness by evenly distributing the spark. The present studydemonstrates the effect of SiC nanopowder on the machining of Inconel 718 at different Discharge Energy Regimes (DER). Significant improvement in MRR, reduction in TWR and surface roughness were observed in nanopowder mixed micro-EDM (NPMμEDM) compared with micro-EDM. The nano additive considerably improved the Material Removal Rate (MRR) by163% and reduced the Tool Wear Rate (TWR)and surface roughness by 24%, 17% respectively. Models were created to predict the Surface Roughness in NPMμEDM using two different approaches namely Support Vector Regression (SVR) and Random Forest Machine (RFM). Both SVR and RFM models were able to predict the Ra value with better accuracies.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100217&lng=en&tlng=en

33

scielo_articles/scl/1516-1439/S1516-14392022000100217.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Elumalai, B.", "Gowri, S.", "Hariharan, P.", "Pillai, K.V. Arun" ]

null

[ "Micro-EDM", "Silicon carbide nanoparticle", "Inconel 718", "Machine learning" ]

null

[ "Easwari Engineering College", "Anna University" ]

scl/1516-1439/S1516-14392022000100207.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100207

10.1590/1980-5373-mr-2021-0083

ENGINEERING, CHEMICAL

Universidade Federal de Alfenas

null

Obtaining Porous Zinc Oxide Ceramics Using Replica Technique: Application in Photocatalysis

Faria, Felipe P.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

This research investigated the production of porous zinc oxide (ZnO) ceramics obtained by the replica method for water depollution by photocatalytic processes. Five photo-decolorization cycles were performed to analyze the reuse potential of the ceramics. Statistical analyses using R programming were conducted to investigate possible significant differences between them. The ceramics porosities were between 46.74 and 62.50% (depending on the composition). The most successful results were achieved in prepared ceramics from slurries containing 65% ZnO and 1% carboxymethylcellulose, in which the dye decolorization results reached 90.5% after 5 cycles, indicating a high reuse potential of these ceramics. Multivariate analysis proved the negative effect of increasing the heat treatment temperature on the evaluated properties. The best processing conditions to obtain porous ZnO ceramics by the replica technique were established through statistical tools, with very satisfactory results in the photo-decolorization potential of the investigated dye.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100207&lng=en&tlng=en

44

scielo_articles/scl/1516-1439/S1516-14392022000100207.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Faria, Felipe P.", "Ruellas, Thamara M. O.", "Roveri, Carolina Del", "Malafatti, João Otávio Donizette", "Paris, Elaine Cristina", "Giraldi, Tânia R.", "Maestrelli, Sylma C." ]

null

[ "Ceramic processing", "Porosity", "Rhodamine B", "Advanced Oxidation Processes" ]

null

[ "Universidade Federal de Alfenas", "Empresa Brasileira de Pesquisa Agropecuária" ]

scl/1516-1439/S1516-14392022000100206.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100206

10.1590/1980-5373-mr-2020-0577

ENGINEERING, CHEMICAL

Pontifícia Universidade Católica de Minas Gerais

null

Study on the Tribological Behavior of Wear and Friction Coefficient on AISI M35 High-Speed Steel with and without DLC Coating

Martins, Paulo Sérgio

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract To improve the wear resistance of cutting tools made of high-speed steel, the Diamond-Like Carbon (DLC) coating appears as a promising alternative. There are several methods to assess wear, however, it is a challenge for manufacturing engineering to work with thin films, due to the uncertainty in the boundary of the substrate and the coating. Based on this concern, this study proposed the evaluation of the tribological behavior of the DLC coating deposited on AISI M35 steel, seeking to predict its behavior in machining conditions based on characterizations, nano-indentation, micro-abrasion and ball-on-disc test. Results showed that the DLC coating produced for this study consists mainly of sp2 hybridizations. The results of the nano-indentation showed that DLC coating may have a better wear resistance when compared to high-speed steel, and the nano-hardness and Young's modulus do not necessarily obey a positive correlation. Compared to high-speed steel, DLC provided reductions of 71% and 69% without micro-abrasive wear and without friction coefficient during sliding, respectively.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100206&lng=en&tlng=en

68

scielo_articles/scl/1516-1439/S1516-14392022000100206.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Martins, Paulo Sérgio", "Carneiro, José Rubens Gonçalves", "Ba, Elhadji Cheikh Talibouya", "Vieira, Vitor Ferreira", "Amaral, Diego Boaventura", "Cruz, Nilson Cristino da" ]

null

[ "High-Speed Steel", "AISI M35", "Thin films", "DLC", "Abrasive wear", "Friction coefficient", "Tribological surface" ]

null

[ "Pontifícia Universidade Católica de Minas Gerais", "Centro Federal de Educação Tecnológica de Minas Gerias", "Centro Federal de Educação Tecnológica de Minas Gerais", "Fiat Chrysler Automobiles", "Universidade Estadual Paulista Júlio de Mesquita Filho" ]

scl/1516-1439/S1516-14392022000100205.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100205

10.1590/1980-5373-mr-2021-0257

ENGINEERING, CHEMICAL

Universidade Federal de Ouro Preto

null

Effect of Step Quenching Heat Treatments on the Kinetics of Ferrite Formation and Quenching & Partitioning Modeling for a Commercial C-Mn-Si Steel

Magalhães, Charles H. X. M.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Aiming to meet current demands from the automotive industry, a third generation of advanced high strength steel (AHSS) has been developed as an alternative to previous generations. Different alloys and innovative processes have been deeply studied as, for example, quenching and partitioning (Q&P). The published papers highlight that the best heat treatment parameters for a satisfactory Q&P execution are strongly dependent on the austenite conditioning and they can be optimized if thermodynamic and kinetics calculations are performed. In this context, this work evaluated the effect of step quenching (SQ) heat treatments on the kinetics of ferrite formation and Q&P modeling for a commercial C-Mn-Si steel, predicting the microstructural evolution and the final phase fractions as a function of the heat treatment parameters. The JMAK model was optimally fitted to the ferrite fraction, as well as to the microhardness data. The kinetics characterization and the thermodynamic modeling showed that the combination of SQ and Q&P can provide a high retained austenite fraction in a multiphase microstructure. As a conclusion, it is possible to state that a well-planned SQ heat treatment followed by an optimized Q&P cycle has the potential to generate an advanced steel with a final microstructure assisted by the TRIP effect.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100205&lng=en&tlng=en

54

scielo_articles/scl/1516-1439/S1516-14392022000100205.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Magalhães, Charles H. X. M.", "Campos, Pablo H. K.", "Faria, Geraldo L." ]

null

[ "Step quenching", "kinetics of ferrite formation", "quenching and partitioning modeling", "AHSS", "thermodynamics simulation" ]

null

[ "Universidade Federal de Ouro Preto" ]

scl/1516-1439/S1516-14392022000100204.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100204

10.1590/1980-5373-mr-2021-0139

ENGINEERING, CHEMICAL

Universidade Federal da Bahia

null

Study of Glycerol as an Additive in Ni-Mo Electrodeposition

Costa, Javan Grisente dos Reis da

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

This paper evaluates the effect of adding glycerol to the electrodeposition bath on the deposition efficiency and characteristics of Ni-Mo coating in concentrations ranging from 0.07 to 0.82 mol.L-1. Evaluation of the corrosion resistance was performed by means of weight loss tests in four different periods of immersion. Electrochemical techniques, such as obtaining polarization curves, linear polarization resistance, corrosion current density, corrosion potential, and electrochemical impedance spectroscopy were applied. Corrosion measurements were obtained in 0.5 mol.L-1 NaCl acid solution and 0.5 mol.L-1 NaOH alkaline solution. The morphology and microstructures of electrodeposited were analyzed using Scanning Electron Microscopy and Spectrometry X-Ray Diffraction. The effect of glycerol on Ni-Mo hardness was evaluated by Vickers microhardness measurements. The presence of glycerol in the electrodeposition bath increased the grain size and decreased the hardness of the coating. However, it promoted the formation of a more compact and less porous coating, increasing the corrosion resistance of the coating. Moreover, the addition of 0.82 mol.L-1 glycerol increases current efficiency, thereby reducing the amount of energy consumed during electroplating.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100204&lng=en&tlng=en

45

scielo_articles/scl/1516-1439/S1516-14392022000100204.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Costa, Javan Grisente dos Reis da", "Rocha, Cláudia Lisiane Fanezi da", "Lima, Luiz Rogério Pinho de Andrade", "Ribeiro, Daniel Veras", "Souza, Carlos Alberto Caldas de" ]

null

[ "Corrosion", "glycerol", "electroplating", "Nickel", "Molybdenum" ]

null

[ "Universidade Federal da Bahia", "Universidade Federal da Bahia" ]

scl/1516-1439/S1516-14392022000100203.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100203

10.1590/1980-5373-mr-2021-0342

ENGINEERING, CHEMICAL

Instituto Federal de Pernambuco

null

The Influence of Environmental Stress Cracking (ESC) and Gamma Irradiation on the Mechanical Properties of Polycarbonate: Study of Synergistic Effects

Silva, Pietro Paolo de O. e

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Polycarbonate is an engineering polymer due its outstanding properties and is widely used in several different applications. In some of these applications it can be exposed to certain liquids/solvents. In many cases, this liquid exposure may cause an effect known as Environmental Stress Cracking (ESC), which may lead to crack formation on the polymer surface and consequent reduction of its mechanical resistance, with loss of lifetime. On the other hand, polycarbonate medical supplies are often exposed to gamma rays in the radio-sterilization process, at doses up to 25 kGy. This exposure causes main chain scissions. In this present work, the viscosity average molecular weight decreased about 10% at 25 kGy. Elongation at break was drastically affected by ESC phenomenon. When simultaneously exposed to the ESC agents (methanol or isopropanol) and gamma radiation, combined effects of both takes place. Moreover, the stress relaxation rate of ~1000 Pa/s (air or methanol) and ~2200 Pa/s (isopropanol) at the dose of 100 kGy, suggests strong influence of isopropanol as surfactant on PC. Results of elongation at break and stress relaxation rate were reliable data to evaluate ESC and radiolytic effects on PC.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100203&lng=en&tlng=en

56

scielo_articles/scl/1516-1439/S1516-14392022000100203.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Silva, Pietro Paolo de O. e", "Araujo, Patricia L. B.", "Lima, Thaises Brunelle Santana de", "Araujo, Elmo S." ]

null

[ "Polycarbonate", "Gamma radiation", "ESC", "Mechanical properties", "Degradation" ]

null

[ "Instituto Federal de Pernambuco", "Universidade Federal de Pernambuco", "Universidade Federal de Pernambuco" ]

scl/1516-1439/S1516-14392022000100202.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100202

10.1590/1980-5373-mr-2021-0206

ENGINEERING, CHEMICAL

Universidade de São Paulo

null

Physico-Chemical Characterization of Tropical Wood Species for Use and Production of Grilling Planks

Guedes, Ulysses Harley

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The objective of this research is to evaluate the possibility of use of tropical hardwood species (Amburana cearensis and Cedrella fissilis) for grilling plank production. Physical, chemical and organoleptic properties were evaluated and compared with properties of a well-used wood specie for grilling plank across Europe and USA, Western Red Cedar (Thuja plicata). For chemical analysis, three techniques were used: hydro distillation, soxhlet and head space. Normality test and analysis of variance (ANOVA) were used for the comparison between Thuja plicata and tropical hardwoods. The results of organoleptic, chemical and statistical analysis demonstrated the possibility of use of Amburana cearensis and Cedrella fissilis on grilling plank production, with no volatile compound present in these species being toxic, low apparent density and Nerolidol presence, chemical compound used as flavoring agent, enabling their use as grilling planks.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100202&lng=en&tlng=en

25

scielo_articles/scl/1516-1439/S1516-14392022000100202.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Guedes, Ulysses Harley", "Nascimento, Maria Fátima do", "Silva, Diogo Aparecido Lopes", "Christoforo, André Luis", "Lahr, Francisco Antonio Rocco", "Panzera, Tulio Hallak", "Aquino, Vinicius Borges de Moura", "Saraiva, Raísse Layane de Paula" ]

null

[ "grilling plank", "apparent density", "Brazilian tropical hardwood", "chemical analysis" ]

null

[ "Universidade de São Paulo", "Universidade de São Paulo", "Universidade Federal de São Carlos", "Universidade Federal de São Carlos", "Universidade de São Paulo", "Universidade Federal de São João del-Rei", "Universidade Federal do Sul e Sudeste do Pará" ]

scl/1516-1439/S1516-14392022000100216.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100216

10.1590/1980-5373-mr-2021-0540

ENGINEERING, CHEMICAL

Universidad Nacional Autónoma de México

null

An Overview of the Interactions Between Reinforcements and Al Matrices with Si, Cu And Mg as Alloying Elements in Aluminum Matrix Composites: Case of Oxide Reinforcements

Guerrero, C.T.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Oxides (Al2O3, SiO2, TiO2, ZrO2, Y2O3, CeO2, MgO) are among the most used reinforcements for Aluminum Matrix Composites (AMC); while the combination of Al with Si, Cu and/or Mg excels among the alloying systems used as matrices. Some works in literature study the effects of the reinforcements and the alloying elements on the composites manufacturing, microstructure and mechanical properties. Nevertheless, it is necessary a recompilation of the interactions oxide reinforcement-alloyed matrix, including the reciprocal effects between them. Our search revealed that not only reactions occur at the interfacial regions, but also other phenomena depending on the reinforcement characteristics and the matrix composition, which affect mechanical properties. These phenomena include modifications in the matrix microstructure and its precipitation process, diffusion of elements through the interfaces, change in the reinforcement wettability by the liquid metal, loss of alloying elements, and deterioration of the reinforcement. This work presents the occurrence of these phenomena for Al matrices with different contents of Si, Cu and Mg reinforced with the most used oxides. Its novelty lies in exploring these combinations of conditions, which could serve as a benchmark study and help for a better understanding and selection of the matrix-reinforcement system.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100216&lng=en&tlng=en

194

scielo_articles/scl/1516-1439/S1516-14392022000100216.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Guerrero, C.T.", "González, F.", "Soto, T.E.", "Aguilar, C.", "Figueroa, I.A.", "González, G.", "Vargas, J.", "Alfonso, I." ]

null

[ "Al alloys", "Al-Si-Cu-Mg", "reinforcement", "oxide", "composite", "interface" ]

null

[ "Universidad Nacional Autónoma de México", "Universidad Autónoma Metropolitana-Iztapalapa", "Universidad Técnica Federico Santa María", "Universidad Nacional Autónoma de México" ]

scl/1516-1439/S1516-14392022000100218.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100218

10.1590/1980-5373-mr-2021-0280

ENGINEERING, CHEMICAL

Universidade Federal de São Paulo

null

Creep and Mechanical Behavior Study of Inconel 718 Superalloy

Sugahara, Tarcila

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Over the years, the demand for high engine efficiency has resulted in the development of new generation superalloys with improved elevated temperature properties, especially creep resistance. This study aimed to evaluate creep and mechanical behavior of Inconel 718 superalloy. Creep tests were performed at temperature range of 650 to 700 °C and stress range of 625 to 814 MPa. Hot tensile and oxidation tests were performed and the characterization techniques used in this study were scanning electron microscopy (SEM) for microstructural and fracture surface analysis, transmission electron microscopy (TEM) for precipitates analysis; grazing X-ray diffraction for analysis of oxide formation and Vickers microhardness. The analyze of stress exponent value (n = 36.48) and activation energy (Qc = 512.97 kJ/mol), suggested that creep mechanism at 650 °C was the climb dislocation mechanism. The Inconel 718 presented ductile fracture at 650 and 700 °C and intergranular fracture to 675 °C.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100218&lng=en&tlng=en

34

scielo_articles/scl/1516-1439/S1516-14392022000100218.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Sugahara, Tarcila", "Couto, Antônio Augusto", "Barboza, Miguel Justino Ribeiro", "Piorino Neto, Francisco", "Takahashi, Renata Jesuina", "Reis, Danieli Aparecida Pereira" ]

null

[ "Creep", "Inconel 718", "Mechanical behavior", "Materials characterization" ]

null

[ "Universidade Federal de São Paulo", "Universidade Presbiteriana Mackenzie", "Universidade de São Paulo", "Instituto Nacional de Pesquisas Espaciais" ]

scl/1516-1439/S1516-14392022000100234.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100234

10.1590/1980-5373-mr-2021-0430

ENGINEERING, CHEMICAL

Easwari Engineering College

null

Microstructural Analysis and Mechanical Behaviour of Copper CDA 101/AISI-SAE 1010 Dissimilar Metal Welds Processed by Friction Stir Welding

Giridharan, K.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

In this work, low-carbon steel AISI-SAE grade 1010 with copper grade CDA 101 was joined by friction stir welding (FSW) using a tapered pin profiled tool. The rotational speed of the tool is 900 rpm, a traverse rate of 30 mm/min, and an axial force of 5 kN were used to produce the joints. The microstructural analysis and mechanical properties of the weld joints have been successfully examined. The optical microscopy, scanning electron microscopy, and X-ray diffraction (XRD) techniques were performed to examine the macropatterns and micropatterns of the welded joints. The tensile and hardness test was performed to evaluate the mechanical behaviours of the FSW joints. The fine ferrite grain features with uniform size were obtained in the microstructure of the nugget zone (stir zone). It is purely influenced by the alternating dynamic rearrangement (recrystallization) mechanism. High hardness was identified in the stir zone, even as the slightest stability was established in the heat-affected zone. The tensile investigation proposed that all the joints explored just lesser unbending nature than the parent material. The tensile strength of 181.5 MPa, the hardness of 144 VHN, and elongation of 14.03% were observed for the welded samples. The better properties for the weld joints were attained at 900 rpm spindle speed and tool traverse speed of 30 mm/min. The FSW is an attractive material joining process for both similar and dissimilar materials compared to other conventional types of joining processes, such as aerospace, marine engineering, shipbuilding, and industrial sector applications.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100234&lng=en&tlng=en

61

scielo_articles/scl/1516-1439/S1516-14392022000100234.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Giridharan, K.", "Sevvel, P.", "Stalin, B.", "Ravichandran, M.", "Sureshkumar, P." ]

null

[ "Copper", "low-carbon steel", "friction stir welding", "mechanical properties", "microstructure" ]

null

[ "Easwari Engineering College", "S.A. Engineering College", "Anna University", "K. Ramakrishnan College of Engineering", "Ramco Institute of Technology" ]

scl/1516-1439/S1516-14392022000100227.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100227

10.1590/1980-5373-mr-2021-0447

ENGINEERING, CHEMICAL

Universidade Federal do Rio Grande do Sul

null

Microstructure and Wear Properties of a Low Carbon Bainitic Steel on Plasma Nitriding at Different N2-H2 Gas Mixtures

Dalcin, Rafael Luciano

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

For the first time, the influence of gas mixture on first damage resistance of a plasma nitrided DIN 18MnCrSiMo6-4 bainitic steel was investigated. Samples were nitrided at 500 °C with three different N2-H2 gas mixtures, containing 5, 24, and 76 vol.% N2. Samples were characterized concerning the resulting roughness, microstructure, compound layer’s phase composition, residual stresses in the diffusion zone, and surface hardness. Tribological ball-on-flat tests were carried out in reciprocal mode using zirconia as ball material for friction coefficient and the compound layer resistance until the first damage. The test results were evaluated statistically by analysis of variance (ANOVA). As the amount of nitrogen in the gas mixture decreases, the ε-Fe2-3(C)N content in the compound layer decreases. A γ’-Fe4N monophasic compound layer was achieved at 5 vol.% N2 gas mixture. The diffusion zone as expected presented compressive residual stresses with the highest values near the surface. In the tribological tests, better results were obtained for 5 and 24 vol.% N2 in the gas mixture as higher amounts of γ’-Fe4N were formed. The 76 vol.% N2 gas mixture led to a brittle behavior, due to the biphasic compound layer (γ’-Fe4N and ε-Fe2-3(C)N) with a predominant content of ε-Fe2-3(C)N.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100227&lng=en&tlng=en

52

scielo_articles/scl/1516-1439/S1516-14392022000100227.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Dalcin, Rafael Luciano", "Rocha, Alexandre da Silva", "Castro, Victor Velho de", "Neves, Julio Cesar Klein das", "Silva, Carlos Henrique da", "Torres, Ricardo Diego", "Nunes, Rafael Menezes", "Malfatti, Célia de Fraga" ]

null

[ "Bainitic Steel", "Plasma Nitriding", "Gas Mixture Influence", "Compound Layer", "Tribological Characterization" ]

null

[ "Universidade Federal do Rio Grande do Sul", "Universidade Federal do Rio Grande do Sul", "Universidade Tecnológica Federal do Paraná", "Pontifícia Universidade Católica do Paraná" ]

scl/1516-1439/S1516-14392022000100233.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100233

10.1590/1980-5373-mr-2021-0406

ENGINEERING, CHEMICAL

Unigal Usiminas

null

Trajectory of Top-Dross Particles During the Melting of Zinc Ingot in Galvanizing Pot

Vieira, Ronaldo Rodrigues

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

The production of hot-dip galvanized steel presents great challenges, because it is currently the main raw material in the manufacturing of automobiles, and its surface quality is fundamental for the construction of automobiles. Obtaining the best surface appearance in galvanized steels is directly related to understanding the phenomena involved in the galvanizing process. In this process, achieving thermal and chemical stability of the galvanizing pot means keeping top-dross formation under control. The top-dross is the main problem to be controlled, because it impacts the surface quality of coated steel. Some studies have been conducted to understand the formation of top-dross particles into the zinc bath, but little is known about the path of the particles formed from the melting ingots. In this study, the trajectories of these particles were simulated. It has been found that, depending on the immersion depth, dross particles may have different destinations.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100233&lng=en&tlng=en

24

scielo_articles/scl/1516-1439/S1516-14392022000100233.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Vieira, Ronaldo Rodrigues", "Duarte, Izabela Diniz", "Eleutério, Henrique Lacerda", "de Oliveira, Thalisson Gustavo", "Bagatini, Maurício Covcevich", "Tavares, Roberto Parreiras" ]

null

[ "Computational Simulation", "Mathematical Model", "Hot Galvanizing", "Dross" ]

null

[ "Unigal Usiminas", "Centro de Pesquisa e Desenvolvimento da Usiminas", "Instituto ESSS", "Universidade Federal de Minas Gerais" ]

scl/1516-1439/S1516-14392022000100232.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100232

10.1590/1980-5373-mr-2021-0346

ENGINEERING, CHEMICAL

Universidade de São Paulo

null

Electrochemical Behavior of Co-Cr Alloy in Hygienic Tablets Solution

Pupim, Denise

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Objective The aim of this study was to evaluate the electrochemical behavior of a cobalt-chromium (Co-Cr) dental alloy after immersion in denture cleansers. Method: Twenty-four specimens (Ø13x2mm) of Co-Cr were produced and divided into three groups (n=8) according to their experimental condition. The group 1 (control group) was composed only of distilled water, group 2 received a hygienic tablet (Corega Tabs™) at the moment that electrochemical test started, while the group 3 received the hygienic tablet (Corega Tabs™) 1h after immersion. The electrochemical tests recorded the open circuit potential (OCP) and current density (icorr). The surfaces of specimens were examined using a SEM. Data were statistically analyzed using analysis of variance (ANOVA) and Duncan test’ multiple comparisons post hoc analysis (α=0.05). Results: The values of OCP and icorr revealed statistically differences between the groups. The highest results were recorded for group 2 (-26.87±48.48mV; 0.29±0.22μA), which were similar to group 3 (-47.37±35.36mV; 0.26±0.10μA), and these values were difference to group 1 (-314.87±24.22mV; 0.50±0.17μA). SEM image show high corrosion with Corega Tabs™. Conclusion: The immersion in denture cleanser solution was not detrimental to the Co-Cr dental alloy and presented a lower tendency to corrosion process development than the control group.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100232&lng=en&tlng=en

37

scielo_articles/scl/1516-1439/S1516-14392022000100232.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Pupim, Denise", "Peixoto, Raniel Fernandes", "Macedo, Ana Paula", "Mattos, Maria da Gloria Chiarello de", "Galo, Rodrigo" ]

null

[ "corrosion", "dental alloy", "hygienic tablet", "Co-Cr alloy" ]

null

[ "Universidade de São Paulo", "Universidade Federal do Ceará" ]

scl/1516-1439/S1516-14392022000100231.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100231

10.1590/1980-5373-mr-2021-0283

ENGINEERING, CHEMICAL

Universidade Federal Fluminense

null

Nondestructive Microstructural Characterization of Austenitic-Ferritic Stainless Steel Welded Joints by Double Loop Electrochemical Polarization Reactivation Portable Test

Almeida, Brígida Bastos de

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Austenitic-ferritic stainless steels are alloys with controlled additions of Cr, Ni, Mo and N which, after a suitable thermomechanical treatment, results in a balanced microstructure with similar proportions of ferrite (δ) and austenite (γ). Thus, it is possible to obtain good combinations of high mechanical properties and corrosion resistance through microstructural refinement, which also leads to a relatively good Pitting Resistance Equivalent value (PRE) at both phases. However, inadequate heat treatment and/or welding processes might result in the precipitation of deleterious phases, leading to poor mechanical properties and/or corrosion resistance. In this sense, the use of non-destructive microstructural characterization techniques becomes a valuable resource to access such alterations. Therefore, this work evaluates the precipitation of deleterious phase’s in welded thermal aged joints by portable Double Loop Electrochemical Polarization Reactivation (DL-EPR) taking into account a preliminary metallographic replica characterization. The results show that the proposed portable method can detect even a small percentage of deleterious phases, in addition to having a strong potential to be a non-destructive microstructural characterization technique.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100231&lng=en&tlng=en

16

scielo_articles/scl/1516-1439/S1516-14392022000100231.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Almeida, Brígida Bastos de", "Cardoso, Andréia de Souza Martins", "Garcia, Pedro Soucasaux Pires", "Ribeiro da Igreja, Hugo", "Chales, Rodrigo", "Noris, Leosdan Figueiredo", "Pardal, Juan Manuel", "Tavares, Sérgio Souto Maior", "Ponzio, Eduardo Ariel" ]

null

[ "Austenitic-ferritic stainless steel", "Welding", "Non-Destructive Testing", "Metallographic replica", "DL-EPR" ]

null

[ "Universidade Federal Fluminense", "Universidade Federal Fluminense", "Universidade Federal Fluminense", "Centro Federal de Educação Tecnológica Celso Suckow da Fonseca" ]

scl/1516-1439/S1516-14392022000100230.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100230

10.1590/1980-5373-mr-2021-0278

ENGINEERING, CHEMICAL

Xi’an University of Science and Technology

null

Effect of Rare Earth on the Corrosion Resistance of Electroless Ni-Mo-P Composite Coatings

Jia, Ya-Peng

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

A kind of corrosion-resistant Ni-Mo-P composite coating was deposited on the surface of AZ91D magnesium alloy substrate by electroless plating method with different concentration of Ce(NO3)3 and Nd(NO3)3. The deposition mechanism of Ni-Mo-P composite coating was explored. Furthermore, the effects of Ce(NO3)3 and Nd(NO3)3 concentration on the microstructure and properties of Ni-Mo-P composite coatings were studied. Results indicated that the Ni-Mo-P composite coatings prepared by adding the optimal concentration of Ce(NO3)3 and Nd(NO3)3 had few defects. Meanwhile, the deposition rate of the composite coatings and the adhesion between the coating and the magnesium alloy substrate were improved. When the concentration of Ce(NO3)3 and Nd(NO3)3 were 0.10 and 1.00 g/L, the Ni-Mo-P composite coatings had the minimum corrosion rate of 0.826 and 0.681 g/m2·h, respectively. Herein, compared with the addition of Ce(NO3)3, the Nd(NO3)3 added Ni-Mo-P composite coating has the maximum arc radius of capacitive resistance and significant improvement corrosion resistance.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100230&lng=en&tlng=en

32

scielo_articles/scl/1516-1439/S1516-14392022000100230.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Jia, Ya-Peng", "Sun, Wan-Chang", "Xiao, Yan", "Liu, Yu-Wan", "Tian, Sha-Sha" ]

null

[ "AZ91D magnesium alloy", "Electroless plating", "Ni-Mo-P composite coatings", "Rare earth", "Microstructure", "Corrosion resistance" ]

null

[ "Xi’an University of Science and Technology" ]

scl/1516-1439/S1516-14392022000100259.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100259

10.1590/1980-5373-mr-2021-0557

ENGINEERING, CHEMICAL

Manipal Academy of Higher Education

null

Artificial Neural Network for Predicting Hardness of Multistage Solutionized and Artificially Aged LM4 + TiB2 Composites

Srinivas, D.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Aluminium casting alloy LM4 (EN 1706 AC-45200) composites with TiB2 (1, 2, and 3 wt.%) as reinforcements were produced using the two-stage stir casting method. OM and SEM study shows uniform and homogeneous reinforcement distribution in LM4 + TiB2 composites. As-cast composites were subjected to single-stage solution treatment at 520°C for 2 h and multistage solution treatment at 495 and 520°C for 2 and 4 h, followed by hot water quenching at 60°C and aging at 100 and 200°C for different time intervals. The hardness of as-cast and artificially aged composites were compared in both conditions. Compared to as-cast LM4 alloy, 20-45% improvement in hardness was observed for LM4 + TiB2 as-cast composites. 60-150% improvement in hardness was observed in artificially aged LM4 + 3 wt.% TiB2 composites when aged at 100 and 200°C during peak aged conditions. TEM images confirmed the presence of primary strengthening solute-rich phases after age hardening treatment such as θ’-Al2Cu and θ”-Al3Cu, which are responsible for hardness increment. An artificial neural network (ANN) model was created to predict the hardness trend of these composite samples using MATLAB R2021b, and results proved that the ANN model developed can be utilized as an effective tool to predict the hardness of treated composite samples.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100259&lng=en&tlng=en

37

scielo_articles/scl/1516-1439/S1516-14392022000100259.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Srinivas, D.", "Shankar, Gowri", "Sharma, Sathyashankara", "Shettar, Manjunath", "Hiremath, Pavan" ]

null

[ "Single-stage solution heat treatment (SSHT)", "Multistage solution heat treatment (MSHT)", "Aging treatment", "Artificial neural network (ANN)", "Hardness", "LM4 - Aluminium casting alloy (EN 1706 AC-45200)" ]

null

[ "Manipal Academy of Higher Education" ]

scl/1516-1439/S1516-14392022000100229.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100229

10.1590/1980-5373-mr-2021-0344

ENGINEERING, CHEMICAL

Universidade Federal Fluminense

null

Microstructure and Microhardness of Directionally Solidified Al-Si Alloys Subjected to an Equal-Channel Angular Pressing Process

Sales, Roberto Carlos

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The directional solidification technique allows the study of growth of the solid phase, as-cast structure and, finally, its mechanical characteristics as a consequence of thermal parameters. On the other hand, in the last decade, a process called equal-channel angular pressing (ECAP) has emerged as a widely-known technique in fabrication of ultrafine-grained metals and alloys. Applicability of the ECAP technique affords an excellent potential for changing, in a controlled and beneficial manner, the resulting properties of metals and alloys. For this paper, an experimental research has been conducted to study the effects of solidification parameter (cooling rate) on resulting microhardness in hypoeutectic Al-Si alloys, upon use of an ECAP procedure. The influence of cooling on the scale of the dendritic patterns is presented and discussed with recourse to equations. The resulting microhardness variation with position throughout the as-cast materials and cooling rate were characterized by experimental power laws. Results determined after the solidification experiments have revealed microhardness as a function of both cooling rate and position (P) of the as-cast materials to be dependent on alloy composition. In the ECAP process via route C with three passes, “as-solidified” microstructures have been found to be distorted and fragmented during the severe plastic deformation. This deformation imposed on the billets during the ECAP process facilitated obtaining a fine microstructure and high levels of microhardness were observed. However, even with the ECAP process, it was shown that microhardness is strongly dependent of the cooling rates.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100229&lng=en&tlng=en

36

scielo_articles/scl/1516-1439/S1516-14392022000100229.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Sales, Roberto Carlos", "Ferreira, Leonardo de Olivé", "Almeida, Rangel de Paula", "Terra, Bráulio Pinto", "de Moura, Lucas Jardim", "Ferreira, Alexandre Furtado" ]

null

[ "Equal-channel angular pressing", "ultrafine-grained alloys", "microhardness", "solidification" ]

null

[ "Universidade Federal Fluminense", "Universidade Federal do ABC" ]

scl/1516-1439/S1516-14392022000100260.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100260

10.1590/1980-5373-mr-2021-0583

ENGINEERING, CHEMICAL

Universidade Federal do Rio Grande do Sul

null

Investigation of Residual Stresses within a Friction Welded Steel Pipeline by the Contour and X-ray Diffraction Methods

Diehl, Igor Luis

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Residual stresses (RS) in pipes welded by a fully automated friction welding process, called FRIEX, are investigated using the contour method (CM) and the X-ray diffraction method (XRD). Samples were produced using a self-developed equipment, which is based on the interaction between a consumable intermediate rotary ring and two stationary pipe sections, by varying the loading rate applied during the welding of API 5L B pipes with an API X65 ring. Mechanical and metallurgical properties were locally analyzed through metallography and microflat tensile tests. RS measured by XRD and CM showed comparable values; tensile zones were found in the pipe HAZ and compressive stresses were found in its adjacent areas. Tensile RS of approximately half the local yield strength of the components were also found, mostly on the internal surface, and their values decrease with increasing welding loads. Microflat tensile tests showed an increase in yield strength of pipe TMAZ and HAZ, with a clear influence of loading rates.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100260&lng=en&tlng=en

18

scielo_articles/scl/1516-1439/S1516-14392022000100260.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Diehl, Igor Luis", "Fonseca, Gustavo Cordenonsi da", "Clarke, Thomas Gabriel Rosauro" ]

null

[ "Friction welding", "FRIEX", "Residual stress", "X-ray diffraction", "Contour method" ]

null

[ "Universidade Federal do Rio Grande do Sul" ]

scl/1516-1439/S1516-14392022000100255.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100255

10.1590/1980-5373-mr-2021-0478

ENGINEERING, CHEMICAL

Manipal Academy of Higher Education

null

Water Soaking and Re-Drying Effect on Mechanical and Wear Properties of Nanoclay-Polyester Nanocomposites

Kini, Achutha

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract This research aims to investigate the influence of water soaking and re-drying on the mechanical and wear properties of nanoclay-polyester nanocomposites (NPNCs). The nanoclay addition significantly enhances the mechanical properties of NPNCs in as-made, water-soaked and re-dried conditions. Also, the addition of nanoclay decreased the percentage of reduction in mechanical properties under water-soaking condition. Re-drying recovers more than 90% in values of mechanical properties compared to original values. In contrast, the addition of nanoclay reduces the mass loss (wear test) of specimens in all three conditions. Re-dried specimens have lesser mass loss than water-soaked specimens and greater mass loss than as-made specimens. SEM images illustrate that the absorbed water can alter the fracture and worn-out surface by swelling and plasticization. Also, SEM images reveal that re-drying can reverse the effect of swelling and plasticization of the specimens.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100255&lng=en&tlng=en

31

scielo_articles/scl/1516-1439/S1516-14392022000100255.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Kini, Achutha", "Shettar, Manjunath", "Kowshik, Suhas", "R, Nikhil", "Chate, Ganesh" ]

null

[ "Nanoclay", "Polyester", "Water-soaking", "Re-drying", "Mechanical properties", "Mass loss" ]

null

[ "Manipal Academy of Higher Education", "Reva University", "KLS Gogte Institute of Technology" ]

scl/1516-1439/S1516-14392022000100345.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100345

10.1590/1980-5373-mr-2021-0546

ENGINEERING, CHEMICAL

Universidade Federal de São João del-Rei

null

Surface Finishing and Shape Effects on Corrosion Resistance of Ti-6Al-4V Alloy in the Simulated Body Fluid

Souza, R.C.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Pure titanium and various alloys, such as Ti-6Al-4V, are widely used as biomaterials. In this application, surface finish conditions, topography, and surface reactivity determine excellent cellular adhesion and osseointegration characteristics. The study evaluated the influence of four surface finishing treatments (sanding #120, 600, 1200, and polished with 3 µm alumina paste) and three shapes (concave, convex, and flat) on the corrosion resistance of Ti-6Al-4V at 37 °C in simulated body fluid (SBF) through potentiodynamic polarization and electrochemical impedance spectroscopy. The SBF's ionic composition allowed the formation of a stable passive layer with a low presence of pores on the surface. In addition, the combination of polished surface and convex shape showed the best electrochemical passive behavior.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100345&lng=en&tlng=en

54

scielo_articles/scl/1516-1439/S1516-14392022000100345.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Souza, R.C.", "Maestro, C.A.R.", "Ribeiro Filho, S.L.M.", "Clemasco, S.", "Santos, B.A.F.", "Serenário, M.E.D.", "Malafaia, A.M. De Sousa", "Bastos, I.N.", "Brandão, L.C.", "Bueno, A.H.S." ]

null

[ "Ti-6Al-4V alloy", "Surface finishing", "Shape", "Simulated body fluid" ]

null

[ "Universidade Federal de São João del-Rei", "Universidade do Estado do Rio de Janeiro", "Instituto Tecnológico de Aeronáutica" ]

scl/1516-1439/S1516-14392022000100344.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100344

10.1590/1980-5373-mr-2022-0096

ENGINEERING, CHEMICAL

Yanshan University

null

Electroless Plating of Ni-P and Ni-P-PTFE on Micro-Arc Oxidation Coatings for Improved Tribological Performance

Chen, Zhaoxiang

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Although micro-arc oxidation (MAO) coatings are widely used for anti-wear protection of metals, they usually contain lots of pores and exhibit high coefficient of friction. In this work, porous MAO coatings consisting of Al2TiO5 were fabricated on the titanium substrate, and then Ni-P and Ni-P-polytetrafluoroethylene (PTFE) were deposited via electroless plating to fill MAO pores and improve the tribological performance. Electroless deposited Ni-P has high wear resistance and the incorporated PTFE particles have self-lubricating property. Results show that the micro-pores of the MAO coating were completely filled by deposited Ni-P and Ni-P-PTFE, and the self-lubricating PTFE particles distributed uniformly in the coating. For the MAO-Ni-P-PTFE coating, the MAO and Ni-P components mechanically interlocked and played a load-carrying role during the tribological test, and the dispersed PTFE particles produced low friction. Compared with the MAO and MAO-Ni-P coatings, the MAO-Ni-P-PTFE coating exhibited much lower coefficient of friction and wear rate.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100344&lng=en&tlng=en

33

scielo_articles/scl/1516-1439/S1516-14392022000100344.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Chen, Zhaoxiang", "Zhu, Li", "Ren, Limei", "Liu, Jialin" ]

null

[ "Micro-arc oxidation", "electroless plating", "Ni-P", "PTFE", "tribological performance" ]

null

[ "Yanshan University", "Yanshan University", "Ministry of Education of China" ]

scl/1516-1439/S1516-14392022000100343.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100343

10.1590/1980-5373-mr-2022-0174

ENGINEERING, CHEMICAL

Chennai Institute of Technology

null

Experimental Investigation of Mechanical Performance of Basalt/Epoxy/MWCNT/SiC Reinforced Hybrid Fiber Metal Laminates

Palaniyandi, Shanmugaselvam

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

The primary goal of this study is to see how multi-walled carbon nano tubes (MWCNTs) and nano silicon carbide particles (SiC) affect basalt reinforced epoxy composites made using pressure mould. The aluminium 8090 metal plate was used to strengthen the laminate's core. Tensile, bending, and low velocity impact tests, as well as aesthetics, were investigated and presented for the debate. The physical and low velocity impact characteristics of the produced laminates are considerably improved by including MWCNT/SiC into the epoxy matrix and basalt mixture. The 9 wt. % and 12 wt. % of SiC filled combinations show higher tensile and flexural performances up to 40% than neat composites among the investigated combinations. Drop weight impact tests show a progressive improved energy absorbing response of up to 60% as SiC reinforcement increases. SEM morphology of pure, SiC/MWCNT filled specimens, as well as fragmented surface analyses, were also presented. It was observed from morphological studies that there is a reasonable wettability between matrix/filler/reinforcements. This research work will lay a path for using Basalt/Epoxy/MWCNT/SiC Reinforced Hybrid Fiber Metal Laminates for aerospace and structural applications.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100343&lng=en&tlng=en

32

scielo_articles/scl/1516-1439/S1516-14392022000100343.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Palaniyandi, Shanmugaselvam", "Veeman, Dhinakaran" ]

null

[ "Basalt fiber", "Epoxy matrix", "hybrid composite", "Fiber metal laminates", "Multi-walled carbon", "nano tubes", "Silicon carbide", "SEM" ]

null

[ "Chennai Institute of Technology" ]

scl/1516-1439/S1516-14392022000100245.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100245

10.1590/1980-5373-mr-2021-0416

ENGINEERING, CHEMICAL

Universidad Autónoma de Querétaro

null

Optoelectrical Properties and the Study of Thickness and Annealing in Poly-3-hexylthiophene Based ITO Free Organic Solar Cells with TiO2 and MoO3 as Transport Layers

Solís-Vivanco, J. F.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Inverted organic photovoltaic solar cells were fabricated with the configuration of FTO/TiO2/P3HT:PC61BM/MoO3/Ag. Besides, the influence of transport layers, titanium dioxide and molybdenum trioxide, on the performance of solar cells were investigated. These compounds showed excellent optical (around 80% for molybdenum trioxide and 95% for titanium dioxide), electrical (like charge carrier density of 3.3 x1015 cm-3 and 2.5 x1014 cm-3 for titanium and molybdenum, respectively) and structural (anatase and amorphous hexagonal phase for titanium and molybdenum, respectively) properties to be used as transport layers. Also the influence of the thickness of the electron transport layer is studied, as well as the thickness, temperature and heat treatment time of the active layer. The correct selection of TiO2’s thickness (70 nm) and active layer’s thickness (250 nm) and annealing (at 100 degrees for 8 minutes) can increase the power conversion efficiency. Moreover, the cell fabricated with transport layers and the best conditions found showed a maximum efficiency of 3.3%, which indicates that the titanium dioxide and molybdenum trioxide played a determining role in the solar cell performance.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100245&lng=en&tlng=en

41

scielo_articles/scl/1516-1439/S1516-14392022000100245.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Solís-Vivanco, J. F.", "De Moure-Flores, F.", "Mayén-Hernández, S. A.", "Devi, R. Aruna", "Gómez-Herrera, M. L.", "Santos-Cruz, J." ]

null

[ "organic solar cell", "transport layer", "PCE decay" ]

null

[ "Universidad Autónoma de Querétaro", "Universidad Autónoma de Querétaro" ]

scl/1516-1439/S1516-14392022000100251.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100251

10.1590/1980-5373-mr-2021-0379

ENGINEERING, CHEMICAL

Universidade Federal da Paraíba

null

Quasicrystalline Metal Powder: A Potential Filler for UHMWPE Composites

Figueiredo, Lucas Ricardo Fernandes

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

The mechanical and thermal behavior of ultra-high molecular weight polyethylene (UHMWPE)/metallic quasicrystal powder (MQP) composites are evaluated at filler volume fractions ( ∅ f) of 0.01, 0.02, 0.06 and 0.15. MQP is based on an aluminum alloy, synthesized and characterized to act as a filler for UHMWPE. The preparation of the composites was conducted by compression molding. Morphological analysis reveals larger and smaller MPQ particles, being well distributed, and mechanically anchored in the matrix. The melting temperature was maintained after adding filler, while the crystallinity values decreased. When adding MQP, an improvement in thermal stability is observed by increases in both the initial and maximum weight loss rate temperatures (Tmax). However, when the temperature is about 700°C all composites present oxidation due to the MQP presence. The Pukansky model shows that the 0.06 MQP composites have better interfacial adhesion. This is confirmed by the Nicolais-Narkis equation. This contributes to an increase in the modulus of elasticity of the 0.06 MQP composite in respect to the others. The elongation at break was reduced for the 0.15 MQP composite. However, the higher volume fraction of MQP increased the stiffness of the UHMWPE, reflecting its potential for use as a reinforcement.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100251&lng=en&tlng=en

42

scielo_articles/scl/1516-1439/S1516-14392022000100251.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Figueiredo, Lucas Ricardo Fernandes", "Passos, Tibério Andrade", "Mendonca, Angelo Vieira", "Silva, Lucineide Balbino" ]

null

[ "UHMWPE", "composite", "metallic quasicrystal", "Pukánszky’s Model" ]

null

[ "Universidade Federal da Paraíba", "Universidade Federal da Paraíba" ]

scl/1516-1439/S1516-14392022000100250.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100250

10.1590/1980-5373-mr-2021-0259

ENGINEERING, CHEMICAL

The New College

null

Photovoltaic Solar Application Study of Cu0.5Zn0.5Se Thin Films by Chemical Bath Deposition Method

Rathod, Kisan C.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Inorganic ternary type materials are induced compound is worked as fundamental applications in transformation of the solar light energy into electrical energy. Copper zinc selenide thin films have been synthesized by chemical bath deposition method on to stainless steel plate. The configuration of fabricated cell is p-Cu0.5Zn0.5Se| NaOH(1M) + S(1M) + Na2S(1M) |C(graphite). The Photovoltaic cell characterization of the films is carried out by studying current–voltage characteristics in dark, capacitance–voltage in dark, barrier height measurements, power output, photoresponse and spectral response. The study shows that Cu0.5Zn0.5Se thin films are p-type conductivity. The junction ideality factor was found to be 2.93. The flat band potential was found to be -0.708V. The barrier height value was found to be 0.186 eV. The study of power output characteristic shows open circuit voltage, short circuit current, fill factor and efficiency were found to be 150 mV, 21 μA, 42.13%, and 0.63%, respectively. Photoresponse shows lighted ideality factor is 2.89. Spectral response shows the maximum current observed at 580 nm.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100250&lng=en&tlng=en

30

scielo_articles/scl/1516-1439/S1516-14392022000100250.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Rathod, Kisan C.", "Sanadi, Kallappa R.", "Kamble, Pradip D.", "Kamble, Ganesh S.", "Gaur, Muddsar L.", "Garadkar, Kalyanrao M." ]

null

[ "CBD", "Power output", "Photo response", "Flat band potential", "Spectral response" ]

null

[ "The New College", "Doodhsakhar Mahavidyalaya", "The New College", "Kolhapur Institute of Technology’s College of Engineering", "C.B.Khedgi’s Basaveshwar Science Raja Vijaysinh Commerce", "Shivaji University" ]

scl/1516-1439/S1516-14392022000100249.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100249

10.1590/1980-5373-mr-2021-0125

ENGINEERING, CHEMICAL

Universidade Estadual de Santa Cruz

null

Electrochemical and Economic Evaluation of the Cocoa Bean Shell as a Corrosion Inhibitor in Acidic Medium

Carvalho, Mayara Cristina Fernandes de

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

The inhibition effect of the cocoa bean shell powder (CBSP) on SAE 1008 carbon steel was studied in acidic medium (HCl 0.5 mol L-1) by electrochemical techniques and gravimetric measurements. Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) were used to the chemical and morphological characterization. The gravimetric and EIS results showed that the corrosion rate decreases with increasing inhibitor concentration, reaching the maximum value of 97.92% in 1.77 g L-1 inhibitor (highest concentration studied). Even at the lowest concentration (0.44 g L-1) good corrosion inhibition efficiency (96.03%) was observed. The polarization curves indicated that the CBSP acts as a mixed type inhibitor. The inhibitory molecules adsorption followed the Langmuir isotherm model. The inhibitor economic evaluation showed that the use of CBSP is 48-616 times cheaper than traditional inhibitors. The results showed that CBSP is an efficient corrosion inhibitor for carbon steel and its production is financially attractive.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100249&lng=en&tlng=en

41

scielo_articles/scl/1516-1439/S1516-14392022000100249.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Carvalho, Mayara Cristina Fernandes de", "Almeida, Nayara Maria Santos de", "Silva, Iago Magella Fernandes Costa Rossi e", "Cotting, Fernando", "Aoki, Idalina Vieira", "Capelossi, Vera Rosa" ]

null

[ "Carbon Steel", "Cocoa bean shell", "Natural Corrosion Inhibitor", "EIS", "SVET" ]

null

[ "Universidade Estadual de Santa Cruz", "Universidade Federal de Minas Gerais", "Universidade de São Paulo" ]

scl/1516-1439/S1516-14392022000100248.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100248

10.1590/1980-5373-mr-2021-0318

ENGINEERING, CHEMICAL

Universidade Federal de Itajubá

null

Effect of Process Control Agents on Fe-15at.%Nb powder during Mechanical Alloying

Lamoglia, Marcela Silva

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract In this paper, Fe-15at.%Nb alloys were produced from high purity Fe (min. 99.8%) and Nb (min. 99.8%) powders via a mechanical alloying process. The effects of different Process Control Agents (i.e., methanol, hexane, and stearic acid) were investigated with powder morphologies, particle size distribution, and phase formation, and were sampled after up to 80 milling hours at 350 rpm. The powder morphologies and particle sizes were evaluated using scanning electron microscopy and laser diffraction analysis, respectively, and phases were identified via X-ray powder diffractometry. The results demonstrate for all conditions that, in the early stages, there was significant particle agglomeration due to the ductile-ductile feature of Fe and Nb powders, and latter an amorphization trend up to 80 milling hours. Methanol was the most efficient Process Control Agent in terms of avoiding cold welding, reducing of agglomeration, particle size distribution, reducing contamination and crystallinity reduction rate.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100248&lng=en&tlng=en

55

scielo_articles/scl/1516-1439/S1516-14392022000100248.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Lamoglia, Marcela Silva", "Gonçalves, Pedro Henrique", "Pontes, Ágata Mayara Paula", "Serrano, Leandro Bernardes", "Silva, Gilbert", "Silva, Antonio Augusto Araújo Pinto da" ]

null

[ "Fe-Nb alloy", "Mechanical Alloying", "Process Control Agent", "Phase formation", "Powder Metallurgy" ]

null

[ "Universidade Federal de Itajubá" ]

scl/1516-1439/S1516-14392022000100247.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100247

10.1590/1980-5373-mr-2021-0351

ENGINEERING, CHEMICAL

Manipal Institute of Technology

null

Effect of Machining Parameters on Tool Life and Surface Roughness of AISI 1040 Dual Phase Steel

BM, Gurumurthy

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The purpose of this research is to investigate the effect of heat treatment parameters on the tool life and surface roughness of dual phase steel. Optimization of machining parameters (cutting speed, feed and depth of cut) is carried out for the machinability tests on medium carbon low alloy steel. Taguchi’s method of design is used to carry out machinability tests. Analysis of variance (ANOVA) is carried out to determine the relative contribution of machining parameters on tool life and surface roughness. Microstructure analysis is carried out to ascertain the machining behavior of the steel. Results have shown that, depth of cut and cutting speed are the most significant factors contributing on the variation of the tool life and surface roughness. Optimized machining parameters are calculated in order to obtain higher tool life and lower surface roughness value.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100247&lng=en&tlng=en

25

scielo_articles/scl/1516-1439/S1516-14392022000100247.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "BM, Gurumurthy", "Hindi, Jamaluddin", "Hegde, Ananda", "Sharma, Sathyashankara", "Kini, Achutha" ]

null

[ "Ferrite", "bainite", "martensite", "dual phase", "AISI1040" ]

null

[ "Manipal Institute of Technology" ]

scl/1516-1439/S1516-14392022000100246.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100246

10.1590/1980-5373-mr-2021-0186

ENGINEERING, CHEMICAL

Northeastern University

null

Microstructure and Tensile Properties of Fine-Grained Bulk Copper Fabricated by Thermomechanical Consolidation of Copper Nanopowder/Micron-Sized Powder Blend

Bhatta, Gyanendra

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Samples of fine structured Cu were fabricated by spark plasma sintering (SPS) of compacts of Cu nanopowder/micron-sized powder blend with a ratio of 3:7 by weight, and one of the SPSed samples was further processed by hot extrusion. The microstructures of the as-SPSed and the as-extruded samples and the tensile properties and fracture behavior of the as-extruded sample were studied. It was found that the microstructures of the samples consist of a concoction of ultrafine and coarse grains with high dislocation densities ( ~1015 m-2) as a result of microstructural evolution during material processing. Some nanograins were oxidized to form Cu2O particles residing around the coarse grains. Extrusion of the SPSed sample increases its microhardness from 70 HV to 90 HV. The electrical conductivity of the as-extruded sample reaches 87% international annealed copper standard (IACS), and its tensile properties are 200 MPa for yield strength, 218 MPa for ultimate tensile strength and 9% for elongation to fracture. The tensile test specimens from the as-extruded sample exhibit nearly ideal plastic deformation and undergo ductile fracture, suggesting that the fine-grained copper is a highly desirable material for high strength electrical conductors.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100246&lng=en&tlng=en

43

scielo_articles/scl/1516-1439/S1516-14392022000100246.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Bhatta, Gyanendra", "Valladares, L. De Los Santos", "Domínguez, A. Bustamante", "Moreno, N. O.", "Barnes, C.H.W.", "Chen, Wen", "Zhang, Deliang" ]

null

[ "Copper", "fine grained microstructure", "thermomechanical powder consolidation", "powder metallurgy", "mechanical properties" ]

null

[ "Northeastern University", "Northeastern University", "Universidad Nacional Mayor de San Marcos", "University of Cambridge", "Universidade Federal de Sergipe", "Laiwu Institute of Vocational Technology" ]

scl/1516-1439/S1516-14392022000100244.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100244

10.1590/1980-5373-mr-2021-0415

ENGINEERING, CHEMICAL

Universidad Autónoma de Querétaro

null

Optoelectronic Properties of Antimony Doped Tin Oxide Thin Films Obtained by Spray Pyrolysis

Flores-Hernández, B. R.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Antimony doped tin oxide (ATO) thin films are deposited on corning glass substrate using the spray pyrolysis technique. The experimental parameters such as distance between the substrate and source (10-30 cm), substrate temperature (350-450°C) and atmospheres (Nitrogen and Forming gas) are varied to study their effect on the properties of ATO thin films. The ATO thin film annealed at 425°C exhibits the lowest electrical resistivity of 2.23×10-2 Ω-cm. Besides, the film annealed in the nitrogen atmosphere showed a less resistivity value of 9.06×10-3 (Ω-cm) than the forming gas atmosphere. The film doped with 3 at% of Sb revealed the highest figure of merit value of 11.45x10-2 Ω-1. The preferential orientation is observed at the (200) diffraction plane in all the cases from the structural studies. Furthermore, the intensity of the diffraction planes decreases as the temperature increases. The average transmittance of 75% is obtained for ATO thin films.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100244&lng=en&tlng=en

46

scielo_articles/scl/1516-1439/S1516-14392022000100244.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Flores-Hernández, B. R.", "Morales-Luna, M.", "García, C. E. Pérez", "Mayén-Hernández, S. A.", "Moure-Flores, F. de", "Santos-Cruz, J." ]

null

[ "Transparent Conductive Oxide", "ATO", "Optoelectronic devices" ]

null

[ "Universidad Autónoma de Querétaro", "Universidad de Monterrey" ]

scl/1516-1439/S1516-14392022000100253.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100253

10.1590/1980-5373-mr-2021-0556

ENGINEERING, CHEMICAL

Lanzhou University of Technology

null

Effect of Al2O3 in Refining Slag on the Cleanliness and Fatigue Property of Ultra-low-carbon Automotive Steel

Li, Shujun

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The influence of Al2O3 content in refining slag on the cleanliness and fatigue property of ultra-low-carbon (ULC) automotive steel were investigated based on the industrial experiments. The inclusion-adsorption capacity of the refining slag was calculated and the total [O] (T.O) content of ULC automotive steel was measured. The number density, size distribution and morphology of inclusions were analyzed and their effects on the cleanliness and fatigue property of ultra-low-carbon (ULC) automotive steel were investigated. The results showed that as the Al2O3 content in refining slag increased from 19.92% to 39.73%, the inclusion-adsorption capacity of ULC automotive steel decreased from 210.30 down to 57.12, and the fatigue life from 1.4x104 down to 0.9x104 cycles, while the T.O content of steel increased from 12 up to18 ppm and the inclusion number density from 4 up to 9 per mm2.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100253&lng=en&tlng=en

29

scielo_articles/scl/1516-1439/S1516-14392022000100253.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Li, Shujun", "Du, Xueyan" ]

null

[ "refining slag", "adsorption capacity", "cleanliness", "fatigue property", "UCL automotive steel" ]

null

[ "Lanzhou University of Technology", "Lanzhou University of Technology" ]

scl/1516-1439/S1516-14392022000100243.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100243

10.1590/1980-5373-mr-2021-0429

ENGINEERING, CHEMICAL

Manipal Academy of Higher Education

null

Hybrid Heat Treatment for Conventionally Treatable Steel Powder Reinforced Age Hardenable Aluminium Alloy Matrix Composites and Mechanical Property Evaluation

Bhat, Rajesh

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

The present work is associated with research concentrating on the innovation and use of hybrid heat treatment for eutectoid steel powder (0.8 wt%) reinforced Al-Zn-Mg (Al 7075) alloy composites. Due to high hardness, wear resistance, tensile strength and flexibility modifying heat treatment, heat treatable aluminium metal matrix composites reinforced with heat treatable hard steel particles may be the choice to explore. In this work, an attempt is made to increase hardness and tensile properties to higher levels through hybrid heat treatment, comprising simultaneous treatment to matrix and reinforcement in 3 different routes (Pearlite, Bainite and Martensite) compared to conventional age hardening treatment. SEM images and microhardness distribution witnessed the phase transformation in both matrix and reinforcement. Aging kinetics in conventional age hardening and hybrid treatments is accelerated by the increase in the quantity of reinforcement and increase in aging temperature. The improvement in hardness and tensile strength obtained by conventional age hardening path is further improved by the hybridisation path. Hybridisation route with martensite reinforcement phase shows excellent result in hardness, strength followed by bainite and pearlite path respectively in the decreasing order. In all heat treatment cycles, lower aging temperature marks greater property enhancement compared to higher temperature. Al 7075 with 6 wt% steel powder reinforced (martensite form) composite showed excellent peak age hardness, tensile strength compared to lesser quantity reinforced composites.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100243&lng=en&tlng=en

22

scielo_articles/scl/1516-1439/S1516-14392022000100243.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Bhat, Rajesh", "Hegde, Ananda", "Sharma, Sathyashankara", "Shankar, Gowri", "Murthy, Guru" ]

null

[ "Aluminium metal matrix composites", "microhardness", "pearlite", "bainite", "martensite" ]

null

[ "Manipal Academy of Higher Education" ]

scl/1516-1439/S1516-14392022000100242.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100242

10.1590/1980-5373-mr-2021-0469

ENGINEERING, CHEMICAL

Universidade Federal do Piauí

null

Molybdenum Oxide Coatings Deposited on Plasma Nitrided Surfaces

Monção, Renan Matos

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Molybdenum trioxide (MoO3) thin films are generally deposit on metallic surfaces to increase their tribological performance. In this manuscript, MoOx coatings were for the first time deposited on plasma nitrided surfaces. Vickers microhardness tests, X-ray diffractometry, and micro abrasive wear tests characterized the samples. It was investigated the effect of temperature in hardness and tribological properties of austenitic stainless steel surfaces. When the temperature of plasma nitriding increases, the coating thickness and the nitrogen diffusion on the treated surface also increases, favoring the hardness of the coatings. After MoOx deposition, the predominant MoO3 phase with monoclinic and orthorhombic unit cells was observed. MoOx coatings after plasma nitriding demonstrated the highest wear resistance.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100242&lng=en&tlng=en

19

scielo_articles/scl/1516-1439/S1516-14392022000100242.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Monção, Renan Matos", "Danelon, Miguel Rubira", "Almeida, Larissa Solano de", "Rossino, Luciana Sgarbi", "Marciano, Fernanda Roberta", "Costa, Thércio Henrique de Carvalho", "Feitor, Michelle Cequeira", "Nascimento, Ruben Maribondo do", "Sousa, Rômulo Ribeiro Magalhães de" ]

null

[ "molybdenum oxide, coatings, plasma nitriding", "micro abrasive wear" ]

null

[ "Universidade Federal do Piauí", "Faculdade de Tecnologia de Sorocaba", "Universidade Federal de São Carlos", "Universidade Federal do Piauí", "Universidade Federal do Rio Grande do Norte" ]

scl/1516-1439/S1516-14392022000100241.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100241

10.1590/1980-5373-mr-2021-0442

ENGINEERING, CHEMICAL

Universidade Federal do ABC

null

A review on Corrosion of High Entropy Alloys: Exploring the Interplay Between Corrosion Properties, Alloy Composition, Passive Film Stability and Materials Selection

Nascimento, Camila Boldrini

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

The corrosion resistance of high entropy alloys was reviewed in the present work. The main focus was to explore the correlation between alloy composition, passive film stability and corrosion properties and use this information to develop a materials selection procedure based on the Ashby approach. Corrosion current densities and pitting potentials were the main design parameters used to rank different alloys, based on a careful examination of data published in the literature, considering uniform and localized corrosion, respectively. The outputs of the selection process clearly indicated a strong dependence of the corrosion resistance on passive film stability, although microstructural homogeneity and uniform distribution of alloying elements should not be disregarded. Proper combinations of elements such as Co, Al, Ti, Mo and Cr, especially, are effective at enhancing the corrosion resistance of high entropy alloys.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100241&lng=en&tlng=en

86

scielo_articles/scl/1516-1439/S1516-14392022000100241.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Nascimento, Camila Boldrini", "Donatus, Uyime", "Ríos, Carlos Triveño", "Oliveira, Mara Cristina Lopes de", "Antunes, Renato Altobelli" ]

null

[ "High entropy alloys", "corrosion", "passive film stability", "materials selection" ]

null

[ "Universidade Federal do ABC", "Brunel University London" ]

scl/1516-1439/S1516-14392022000100240.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100240

10.1590/1980-5373-mr-2021-0432

ENGINEERING, CHEMICAL

Instituto Tecnológico de Aeronáutica

null

Structural, Morphological, Vibrational and Optical Properties of GaN Films Grown by Reactive Sputtering: The Effect of RF Power at Low Working Pressure Limit

Oliveira, R. S. de

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract This work reports the properties of GaN films grown onto c-Si (100) at relatively low substrate temperature (400°C) by reactive magnetron sputtering. The study depicts the effect of working pressure and RF power on the GaN film structural, vibrational and optical properties characterized by X-ray diffraction, atomic force and scanning electron microscopies, Raman spectroscopy and spectroscopic ellipsometry. Unusual low pressure deposition condition (0.40 Pa) was achieved by using a separated argon inlet directed to the Ga target surface, resulting in improved crystalline quality of the films. In this condition, the preferential crystalline orientation, the surface morphology and the optical gap of the GaN films show a strong dependence on the RF power applied to the Ga target, where low RF power (30-60 W) was responsible for increasing the c-axis orientation and the optical gap, while higher RF power (75-90 W) decreased the overall crystal quality and increased the surface roughness.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100240&lng=en&tlng=en

41

scielo_articles/scl/1516-1439/S1516-14392022000100240.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Oliveira, R. S. de", "Folli, H. A.", "Stegemann, C.", "Horta, I. M.", "Damasceno, B. S.", "Miyakawa, W.", "Pereira, A. L. J.", "Massi, M.", "Silva Sobrinho, A. S. da", "Leite, D. M. G." ]

null

[ "GaN", "reactive sputtering", "thin film" ]

null

[ "Instituto Tecnológico de Aeronáutica", "Faculdade de Tecnologia SENAI Jaraguá do Sul", "Instituto de Estudos Avançados", "Universidade Presbiteriana Mackenzie" ]

scl/1516-1439/S1516-14392022000100239.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100239

10.1590/1980-5373-mr-2021-0510

ENGINEERING, CHEMICAL

Universidade de Brasília

null

Effect of Addition of Previously-Synthesized Ce-TZP/Al2O3 Submicrometric Powder on the Properties of Al2O3-Based Ceramics

Nascimento, Anne Caroline de Paula

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

This work investigated the effect of a composite of tetragonal zirconia with alumina-reinforced Ceria (ATZ) previously synthesized, on the properties of alumina-based ceramics (Al2O3). Monolithic alumina powder and Al2O3 powder mixtures containing 5, 10, 15 and 20 wt.% of Ce-TZP/Al2O3 were processed by high energy milling, compacted and then sintered at 1600 °C - 2 h. Sintered pure alumina and composites were characterized by relative density, scanning electron microscopy, X-ray diffraction and surface roughness. Then, the elastic modulus, the Vickers hardness, the fracture toughness and the 4-point flexural strength were evaluated. The results indicated an increase in relative density as a function of the addition of ATZ, with values between 94.3 ± 0.8% and 98.9 ± 0.7%. The observed microstructure after sintering showed tetragonal ZrO2 grains with average sizes of 0.6 μm well dispersed in the Al2O3 matrix, which presents average grain sizes of around 1.5 μm. The crystalline phases identified in the composites were ZrO2-tetragonal and Al2O3 hexagonal. The addition of the composite (ATZ) in the alumina matrix generates a gradual reduction in the elastic modulus (398 ± 15 GPa ~366 ± 34 GPa) and in the hardness (20.5 ± 1 GPa ~17.3 ± 0.7 GPa) of the sintered ceramics. On the other hand, the addition of this same composite (ATZ) in the alumina matrix considerably increases the materials fracture toughness, reaching values of approximately 6.7 ± 0.9 MPa.m1/2. The same trend was observed in the flexural strength results which ranged from 258 MPa (5wt.% Ce-TZP/Al2O3) to 316 MPa (20wt.% Ce,Y-TZP/Al2O3). The Ce-TZP reinforcement acts as a toughening agent of the Al2O3 matrix due to the coupled mechanisms of toughening by zirconia phase transformation, residual stresses due to the difference in thermal expansion of the crystalline phases and differences in microstructural morphologies.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100239&lng=en&tlng=en

37

scielo_articles/scl/1516-1439/S1516-14392022000100239.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Nascimento, Anne Caroline de Paula", "Coutinho, Maycol Moreira", "Alves, Manuel Fellipe Rodrigues Pais", "Santos, Claudinei dos", "Ferreira, Jorge Luiz de Almeida", "Silva, Cosme Roberto M." ]

null

[ "Zirconia-toughened alumina (ZTA)", "Ce-TZP reinforcement", "Rietveld refinement", "mechanical properties", "coupled toughening mechanisms" ]

null

[ "Universidade de Brasília", "Universidade do Estado do Rio de Janeiro" ]

scl/1516-1439/S1516-14392022000100238.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100238

10.1590/1980-5373-mr-2021-0489

ENGINEERING, CHEMICAL

Universidade Federal do Ceará

null

Characterization of a Selective Surface Based on Chromium, Iron and Aluminum Oxides for Application in Solar-Thermal Collectors

Dutra, Kaio Hemerson

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

The depletion of conventional energy sources and the concern with the environmental impacts of the use of fossil fuels sparked interest in researching new energy sources and improving existing processes. In this context, the solar energy presents itself as one of the most promising energy sources on the planet, given its wide availability and applicability in thermal processes. However, its use still represents a great technological and economic challenge, because many systems that use this energy still have low efficiency and high cost, which makes them uncompetitive in competition with systems using other energies. With that, the search for the improvement of the processes awakens the researches in more adequate and cheaper materials, which represents a great scientific potential in the evolution of these technologies. Thus, the present work proposes to obtain and analyze a selective surface for applications in solar-thermal collectors, using CRFO (compound formed by chromium and iron oxides), varying the percentage by weight, and then mixed with aluminum oxide. For the tests, an experimental bench was built to simulate a flat plate solar-thermal collector in real operating conditions. Some characterizations were carried out, such as: techniques scanning electron microscopy (SEM), infrared analysis and UV-VIS absorptivity determination, as well as the graphs with surface temperatures and with radiation during the tests in the Sun for the composite (CRFO and aluminum oxide) and for the commercial surface (MRTiNOX). With the results obtained, it was verified in the field test that one of the produced selective surfaces obtained a result of absorptivity of 0.94 and 0.0349 of emissivity, which is close to that of the commercial surface. The results were confirmed in the characterization by UV-VIS, which showed high absorptivity values in the visible light range.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100238&lng=en&tlng=en

16

scielo_articles/scl/1516-1439/S1516-14392022000100238.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Dutra, Kaio Hemerson", "Freire, Francisco Nivaldo Aguiar", "Pinho, Diego Caitano", "Araújo, Felipe Alves Albuquerque" ]

null

[ "Solar energy", "selective surface", "efficiency", "collectors" ]

null

[ "Universidade Federal do Ceará" ]

scl/1516-1439/S1516-14392022000100252.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100252

10.1590/1980-5373-mr-2021-0439

ENGINEERING, CHEMICAL

Università degli Studi di Genova

null

Artificial Neural Network for Predicting Silicon Content in the Hot Metal Produced in a Blast Furnace Fueled by Metallurgical Coke

Cardoso, Wandercleiton

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The main production route for cast iron and steel is through the blast furnace. The silicon content in cast iron is an important indicator of the thermal condition of a blast furnace. High silicon contents indicate an increase in the furnace's thermal input and, in some cases, may indicate an excess of coke in the reactor. As coke costs predominate in the production of cast iron, tighter control of the silicon content therefore has economic advantages. The main objective of this article was to design an artificial neural network to predict the silicon content in hot metal, varying the number of neurons in the hidden layer by 10, 20, 25, 30, 40, 50, 75, 100, 125 , 150, 170 and 200 neurons. In general, all neural networks showed excellent results, with the network with 30 neurons showing the best results among the 12 modeled networks. The validation of the models was confirmed using the Mean Square Error (MSE) and Pearson's correlation coefficient. The cross-validation technique was used to re-evaluate the performance of neural networks. In short, neural networks can be used in practical operations due to the excellent correlations between the real values and those calculated by the neural network.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100252&lng=en&tlng=en

33

scielo_articles/scl/1516-1439/S1516-14392022000100252.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Cardoso, Wandercleiton", "di Felice, Renzo", "Baptista, Raphael Colombo" ]

null

[ "Slag", "Silicon", "Blast furnace", "Statistical analysis", "Artificial neural network" ]

null

[ "Università degli Studi di Genova", "Instituto Federal do Espírito Santo" ]

scl/1516-1439/S1516-14392022000100254.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100254

10.1590/1980-5373-mr-2021-0494

ENGINEERING, CHEMICAL

Universitas Muhammadiyah

null

Combined Effects of Annealing and Cyclic Loading on Structural Rejuvenation and Mechanical Properties of CuZr Metallic Glass: A Molecular Dynamics Study

Anggono, Agus Dwi

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Structural rejuvenation is one of the key topics in the field of metallic glasses (MGs). In this work, we evaluated the combined effects of annealing treatment and elastic cyclic loading to discover pathways for promoting structural rejuvenation and improving the mechanical properties in the MGs. Using molecular dynamics (MD) simulations, it was revealed that the sole cyclic loading led to the increase of rejuvenation degree; however, a saturated state was observed upon the 40th cycle. On the other side, the sample exposed to the combined treatment exhibited a slight relaxation at the first step of cycling process and then a sharp rejuvenation degree was detected in the material. The thorough analyses indicated that the change in the fraction of coordination polyhedrons at the relaxation stage was the main reason for the extra rejuvenation in the sample exposed to the combined treatments. The results also suggest that the combination of rejuvenation treatments improves the magnitude of rejuvenation in the amorphous alloys. It should be noted that the increase of rejuvenation in the alloying systems accompanied with a reduction in the tensile strength and an enhancement in the homogenous plastic deformation.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100254&lng=en&tlng=en

51

scielo_articles/scl/1516-1439/S1516-14392022000100254.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Anggono, Agus Dwi", "Mahmoud, Mustafa Z.", "Suksatan, Wanich", "Chupradit, Supat", "Ali, Muneam Hussein", "Mustafa, Yasser Fakri", "Tuama, Hussein Mhaibes", "Surendar, Aravindhan" ]

null

[ "Metallic glass", "molecular dynamics", "rejuvenation", "heterogeneity" ]

null

[ "Universitas Muhammadiyah", "Prince Sattam bin Abdulaziz University", "University of Canberra", "Chulabhorn Royal Academy", "Chiang Mai University", "Al-Nisour University College", "University of Mosul", "Al-Ayen University", "Saveetha Institute of Medical and Technical Sciences" ]

scl/1516-1439/S1516-14392022000100236.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100236

10.1590/1980-5373-mr-2021-0385

ENGINEERING, CHEMICAL

Universidade de São Paulo

null

Influence of the Commercial Mouthwashes on the Corrosion Behaviour of Dental Alloy

Pupim, Denise

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Dental alloys are widely used in fabrication of removable partial dentures, particularly as a dental framework. The present study aimed at studying the effect of the commercial mouthwashes on the corrosion behavior of the Co−Cr dental casting alloy. Corrosion behavior was investigated in alcohol-free and alcohol-containing mouthwashes added to artificial saliva solutions at room temperature by electrochemical tests recorded the open circuit potential (OCP) and current density, after the surface analysis of the samples was performed. During the early 250s, the OCP values showed significant changes, with the exception of one test group containing alcohol, where potential decreased continuously during the test, which also recorded the highest current density, different from the other groups. It was observed that the presence of alcohol increased the current density and the corrosion process in this alloy and the mouthwashes had more aggressive action in specimens submitted to solutions with alcohol in the composition.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100236&lng=en&tlng=en

26

scielo_articles/scl/1516-1439/S1516-14392022000100236.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Pupim, Denise", "Peixoto, Raniel Fernandes", "Macedo, Ana Paula", "Palma-Dibb, Regina Guenka", "Mattos, Maria da Gloria Chiarello de", "Galo, Rodrigo" ]

null

[ "Dental alloys", "electrochemical corrosion", "commercial mouthwashes", "roughness" ]

null

[ "Universidade de São Paulo", "Universidade Federal do Ceará" ]

scl/1516-1439/S1516-14392022000100263.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100263

10.1590/1980-5373-mr-2021-0269

ENGINEERING, CHEMICAL

Universitas Negeri Malang

null

Structural and Magnetic Properties of Ni-doped Yttrium Iron Garnet (Y3Fe5-XNixO12) Nanopowders Synthesized by Self-Combustion Method

Puspitasari, Poppy

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract This research aimed to investigate the structural and magnetic properties of Yttrium Iron Garnet by Ni-doped using self-combustion method. Ni-doped directly changed the structure into Y3Fe5-XNixO12 (x=0.00, 0.02, 0.04, 0.06, 0.08). Self-combustion method was obtained by stirring raw materials at room temperature (27°–28°C) and heated at 150°C until combustion occurred. The samples were sintered at 900°C with 120 minutes holding time. The phase identification revealed the cubic structure of garnet phase with the crystallite size from 62.73–62.87 nm. The molecular bonding from molecular bonding displayed Ni-O and Fe-O bonds, while the magnetic properties shown the highest saturation magnetization of 27.04 emu/g in the sample with additional Ni x=0.02, the highest magnetic remenance of 16.09 in the sample Ni x=0.02, and the highest coercivity of 0.029 in the sample with Ni x=0.08. This research, by adding nickel element, shows that the coercivity of Y3Fe5-XNixO12 decreased when the particle size is increased. The increase in Ni concentration as doping material cause the double exchange interaction and affected the lattice parameter, molecular bond, and magnetic properties.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100263&lng=en&tlng=en

45

scielo_articles/scl/1516-1439/S1516-14392022000100263.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Puspitasari, Poppy", "Ariffandy, Wahyu", "Budi, Latief Setyo", "Shaharun, Maizatul Shima" ]

null

[ "Yittrium iron garnet", "Nickel", "Phase identification", "Molecular bonding", "magnetic properties" ]

null

[ "Universitas Negeri Malang", "Universitas Negeri Malang", "University Technology Petronas" ]

scl/1516-1439/S1516-14392022000100269.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100269

10.1590/1980-5373-mr-2021-0173

ENGINEERING, CHEMICAL

Akwa Ibom State University

null

A Study of the Morphological Changes and the Growth Kinetics of the Oxides Formed by the High Temperature Oxidation of Cu-32.02% Zn-2.30% Pb Brass

Nyong, Aniedi E.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The high temperature oxidation of Cu-32.02% Zn-2.30%Pb brass was carried in N2-5wt.% O2 and N2-12 wt.% O2 atmospheres. The amounts of oxygen in the oxidizing atmospheres and the time of the oxidation affected the oxide morphologies and kinetics of the oxide growth. In the first hour of the oxidation at 650 °C, oxide nanowires were noted. The average diameter, length and distance between the observed nanowires were 27 ± 0.01 nm, 0.20 ± 0.04 µm and 0.20 ± 0.04 µm respectively for the samples oxidized in N2-5wt.% O2 atmosphere and 102 ± 23 nm, 0.36 ± 0.24 μm and 0.24 ± 0.08 μm respectively for the samples oxidized in N2-12wt.% O2 atmosphere. The EDX and XRD analyses of the nanowires and the oxide granules confirmed ZnO nanowires and a continuous oxide layer of ZnO. The x-ray diffraction confirmed minor presence of PbO. The oxide growth kinetics followed the linear oxide growth model, for the alloy samples that were thermally oxidized in N2-5 wt.% O2 atmposphere and parabolic growth model for those thermally oxidized in N2-12 wt.% O2 atmospheres respectively. The values of 6.8 µm/hour and 23.03 µm/(hour)1/2were determined for growth constant (k), based on the two models respectively.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100269&lng=en&tlng=en

27

scielo_articles/scl/1516-1439/S1516-14392022000100269.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Nyong, Aniedi E.", "Udoh, Godwin", "Awaka-Ama, Joachim J.", "Nsi, Edet W.", "Rohatgi, Pradeep K." ]

null

[ "Thermal oxidation", "growth kinetics", "brass" ]

null

[ "Akwa Ibom State University", "University of Wisconsin-Milwaukee" ]

scl/1516-1439/S1516-14392022000100268.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100268

10.1590/1980-5373-mr-2021-0508

ENGINEERING, CHEMICAL

Tamilnadu College of Engineering

null

Effect of Tool Pin Geometry and Process Parameters During FSW of Dissimilar Alloys of Mg

Yaknesh, S.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Effect of two distinctive tool designs along with other tool related parameters including speed of traverse of tool and offset distance of tool pin during friction stir welding of dissimilar AZ91C and AZ31B alloys of Mg were investigated. Experimental recordings revealed that all the joints fabricated during 1st set of investigations employing cylindrically tapered pin geometry and their offset distances being 0.5 mm or 1mm towards any one of the parent metals possessed flaws. Joint No: II-3 fabricated in 2nd set of investigations by employing 15mm diameter inner shoulder tool with threaded cylindrical tapered pin geometry at a tool offset distance of 0 mm was found be free from flaws. This joint exhibited a tensile strength of 186 MPa which was 78.81% of AZ91C and 70.72% of another parent metal AZ31B. Existence of intermetallic phased constituents, namely, Mg17Al12 in several regions of fractured surfaces have contributed to the supplementary brittleness in the zone of nugget, and have reduced the tensile strength of the joint.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100268&lng=en&tlng=en

48

scielo_articles/scl/1516-1439/S1516-14392022000100268.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Yaknesh, S.", "Sampathkumar, K.", "Sevvel, P." ]

null

[ "Tool pin geometry", "speed of tool traverse", "tool offset distance", "brittle fracture", "AZ31B", "AZ91C" ]

null

[ "Tamilnadu College of Engineering", "Kalaignar Karunanidhi Institute of Technology", "S.A. Engineering College" ]

scl/1516-1439/S1516-14392022000100267.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100267

10.1590/1980-5373-mr-2021-0521

ENGINEERING, CHEMICAL

Universidade Federal de São João del-Rei

null

Proposal of a Novel Criteria for Soil Corrosivity Evaluation and the Development of New Soil Synthetic Solutions for Laboratory Investigations

Giarola, J. M.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract A novel method to classify the aggressiveness of soil considering its physicochemical content and the development of new synthetic solutions for lab uses is proposed. The results showed that the main criteria existing in the literature for soil corrosivity classification might cause misunderstandings about the real aggressiveness. The synthetic solutions proposed aim to cover a wide range of soil found worldwide in order to refine the assessment of their characteristics hence their corrosivity. For the lab experiments, an API 5L X65 pipeline carbon steel was used. The solutions presented great reliability, and they seemed to be adequate to simulate soils with the presence of sulfate-reducing bacteria (SRB), chloride, and high pH.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100267&lng=en&tlng=en

64

scielo_articles/scl/1516-1439/S1516-14392022000100267.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Giarola, J. M.", "Santos, B. A. F.", "Souza, R. C.", "Serenario, M. E. D.", "Martelli, P. B.", "Souza, E. A.", "Gomes, J. A. C. P.", "Bueno, A. H. S." ]

null

[ "Soil corrosion", "physicochemical properties", "synthetic soil solution", "X65 steel" ]

null

[ "Universidade Federal de São João del-Rei", "Universidade Federal do Rio de Janeiro", "Universidade de São Paulo" ]

scl/1516-1439/S1516-14392022000100266.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100266

10.1590/1980-5373-mr-2021-0561

ENGINEERING, CHEMICAL

Prince of Songkla University

null

Effect of Magnetically Treated Tap Water Quenchant on Hardenability of S45C Steel

Chucheep, T

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The objective of this work was to investigate effects of magnetically treated tap water quenchant on hardenability and quenching crack resistance of S45C steel. The magnetically treated water quenchant was prepared by circulating regular tap water though a 130 mT magnetic field. The S45C steel was austenized at 860°C for 30 minutes. The hardenability in transverse section measurement of S45C steel quenched in magnetically treated tap water did not differ from that prepared with regular tap water quenchant. In measurements of the quenched end, the hardenability of S45C Steel quenched in magnetically treated water was below that with tap water quenchant. On the other hand, quenching crack resistance of S45C steel quenched in magnetically treated tap water was higher than that prepared with regular tap water. Moreover, microstructures of specimens quenched in magnetically treated tap water quenchant were different from that with regular tap water quenchant. Fine martensite structure formed in specimen quenched in regular tap water quenchant, while coarse lath martensite formed in specimens quenched in magnetically treated tap water quenchant.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100266&lng=en&tlng=en

20

scielo_articles/scl/1516-1439/S1516-14392022000100266.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Chucheep, T", "Mahathaninwong, N", "Janudom, S", "Sudsiri, C", "Karrila, S", "Ketaiam, W" ]

null

[ "Quenchant", "Magnetically treated tap water", "Tap water", "Hardenability", "S45C steel" ]

null

[ "Prince of Songkla University", "Prince of Songkla University" ]

scl/1516-1439/S1516-14392022000100265.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100265

10.1590/1980-5373-mr-2021-0339

ENGINEERING, CHEMICAL

Universidade Federal Rural do Semi-Árido

null

Effect of Hydrogen on the Mechanical Properties of ASTM A182 F22 and ASTM A36 Steels Welded Joint Using Inconel 625 as Filler and Buttering Metal

Silva, Adiana Nascimento

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract ASTM A 182 F22 steel, used in components subsea for oil extraction, are previously buttered with ductile metal such as Inconel 625, before being welded to steel pipes similar to ASTM A36 steels. The thermal buttering weld cycle provides the formation of high hardness micro-phases and carbides at the interface between F22 steel and the buttering with Inconel, which when in contact with hydrogen, originating from the cathodic protection applied to these equipment, can lead to the embrittlement of this region, causing fragile fractures. In this work, ASTM A 182 F22 steel, buttered with Inconel 625 and welded to A36 steel, submitted to post-weld heat treatment without hydrogenation and subjected to cathodic protection for hydrogen permeation were submitted to fracture toughness test. The welds and buttering were done using GMAW process with AWS ERNiCrMo-3 wire as filler and buttering metal and a mixture of Ar and He as shield gas. The results indicated a 56% of area reduction, and 15% in the elongation values in the tensile tests, in addition to a 13.3% reduction in the CTOD value, for welded joints subjected to hydrogen permeation, which showed a quasi-cleavage fracture mechanism.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100265&lng=en&tlng=en

28

scielo_articles/scl/1516-1439/S1516-14392022000100265.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Silva, Adiana Nascimento", "Costa, Esdras Carvalho", "Almeida, José Gonçalves de", "Maciel, Theophilo Moura", "Cavalcante, Danielle Guedes de Lima", "Passos, Tibério Andrade dos" ]

null

[ "ASTM A182 F22 steel", "Inconel 625", "Welded joints", "Hydrogen embrittlement", "Mechanical Properties" ]

null

[ "Universidade Federal Rural do Semi-Árido", "Universidade Federal da Paraíba", "Universidade Federal da Paraíba", "Universidade Federal da Paraíba" ]

scl/1516-1439/S1516-14392022000100264.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100264

10.1590/1980-5373-mr-2021-0314

ENGINEERING, CHEMICAL

Jiangsu University of Science and Technology

null

Effect of Annealing Time on Microstructure and Properties of P91 Heat Resistant Steel SMAW Joint

Hu, Qingxian

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The microstructure and properties of shielded metal arc welding (SMAW) joint of P91 heat-resistant steel annealed at different holding time were observed and analyzed. The results show that the martensite and residual austenite structures in the weld zone and coarse grain heat affected zone (CGHAZ) were transformed with the extension of holding time. After 760°C+4h annealing, a large number of white rod-shaped precipitates appeared in the weld zone. The main components of precipitates were Fe, Cr, Mn, V, Si, and a small amount of oxides appeared. After 760°C+5h annealing treatment, relatively fine white granular precipitation appeared in the weld zone, and a large number of oxides and some precipitates have been dissolved. After 760°C+6h annealing treatment, the precipitated phases were composed of Fe-Cr, Fe3Si, Ni-Cr-Fe, Fe2MnAl. Compared with the annealing treatment for 5h, the microstructure of the precipitated phase is fine and uniform, dispersion distribution of second phase particles, and the material mechanics is relatively stable.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100264&lng=en&tlng=en

20

scielo_articles/scl/1516-1439/S1516-14392022000100264.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Hu, Qingxian", "Wu, Chengge", "Wang, Yongbin", "Liu, Peng", "Fan, Hongju" ]

null

[ "P91 heat-resistant steel", "annealing", "holding time", "microstructure", "precipitates" ]

null

[ "Jiangsu University of Science and Technology", "Shandong Jiaotong University", "Shandong Jianzhu University" ]

scl/1516-1439/S1516-14392022000100262.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100262

10.1590/1980-5373-mr-2021-0275

ENGINEERING, CHEMICAL

Universidad Politécnica de Catalunya

null

Constitutive Modeling of Hot Deformation of Carbon Steels in The Intercritical Zone

Jiménez-Lugos, Juan Cancio

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract A previous constitutive modeling for single-phase steels is extended using the mixing law to predict the behavior of hot deformation in the dual phase ferritic-austenitic intercritical zone of Fe-C-Mn-Si alloys. Mixing law considers two phases instead one, so one phase formula was modified. The constant’s values used represents average values to the same conditions in austenitic and ferritic model. The amount of each phase is determined as function of temperature and chemical composition. The developed constitutive modeling is validated by comparing the theoretical stress-strain curves with experimental isothermal uniaxial compression tests of 1008 and 1035 carbon steels at different temperatures and strain rates. The compression tests were carried out in a dilatometer with the compression load at strain rate of 10-3, 10-2 and 10-1 s-1. A good agreement was obtained between the calculated and experimental results over different stages of deformation and hardening. Microstructural analysis was also carried out to relate the deformation results to the microstructure of the steels. Finally, a general constitutive equation has been proposed for hot deformation of steels in the intercritical zone.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100262&lng=en&tlng=en

40

scielo_articles/scl/1516-1439/S1516-14392022000100262.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Jiménez-Lugos, Juan Cancio", "Cabrera-Marrero, José María", "Chávez-Alcalá, José Federico", "Hallen-López, José Manuel", "López-Rodríguez, Josué" ]

null

[ "Hot deformation", "modeling", "constitutive equation", "intercritical zone" ]

null

[ "Universidad Politécnica de Catalunya", "Instituto Politécnico Nacional" ]

scl/1516-1439/S1516-14392022000100261.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100261

10.1590/1980-5373-mr-2021-0398

ENGINEERING, CHEMICAL

Centro Federal de Educação Tecnológica

null

Effect of Shear Direction on Work-Hardening Evolution of AISI 409 Steel Under Rolling/Shearing Loading

Morais, F. L. D.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The mechanical behavior of metallic materials depends on several variables, such as the material structural characteristics, the process parameters, the temperature, the strain rate and the anisotropy features due to strain paths in different metal forming operations. Considering the last one, the effect of shear direction loading on the work-hardening after the rolling/shearing loading of a ferritic stainless steel, AISI 409, was investigated in this work. The annealed AISI 409 sheets were predeformed by cold rolling up 0.19 effective strain and then sheared at three different directions: at 0°, 45° and 90° from the original rolling direction. The samples were characterized through tensile, shear and Vickers microhardness tests while the study of crystallographic texture was performed using the electron backscatter diffraction (EBSD) technique. The work-hardening behaviour of the material was analyzed considering the work-hardening rate and the Hollomon work-hardening exponent after each strain path change applied to the AISI 409 steel. The results indicated the presence of preferential crystallographic orientation and the occurrence of transients on the work-hardening rate mainly for the sample sheared at 45° from the original rolling direction due to structural arrangements assumed by the AISI 409 steel after the strain path changes.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100261&lng=en&tlng=en

26

scielo_articles/scl/1516-1439/S1516-14392022000100261.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Morais, F. L. D.", "Corrêa, E. C. S.", "Lopes, W." ]

null

[ "AISI 409 steel", "work-hardening", "strain path" ]

null

[ "Centro Federal de Educação Tecnológica" ]

scl/1516-1439/S1516-14392023000100218.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392023000100218

10.1590/1980-5373-mr-2022-0003

ENGINEERING, CHEMICAL

Universidade do Estado de Santa Catarina

null

Influence of Milling and Use of Ni and Al Containing Metal Binder in NbC-Based Cermets

Dematte, Evandro

2,023

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract This study presents the development of niobium carbide cermets bound to nickel and Ni-12Al (wt%). The use of Ni-12Al (wt%) and Ni aims to replace strategic elements such as cobalt (Co) utilized in tungsten carbide-based cermets. Cermets of different compositions were processed by conventional powder metallurgy. Microstructural analysis with semi-quantitative chemical analysis by EDX, Vickers microhardness and density measurement were performed to evaluate the influence of high energy milling application and sintering temperature on the properties of these cermets. A milling time of 20 min in a planetary mill and sintering temperatures of 1420 ºC or 1450 ºC resulted in homogeneous microstructures, densities close to 90% and hardness of around 1000 HV1, showing a potential for use of this material in cutting tools.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392023000100218&lng=en&tlng=en

33

scielo_articles/scl/1516-1439/S1516-14392023000100218.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Dematte, Evandro", "Franco, Eliana", "Milan, Júlio", "Costa, César Edil da" ]

null

[ "Cermets", "Niobium Carbide", "Nickel", "Aluminum", "Milling", "Sintering" ]

null

[ "Universidade do Estado de Santa Catarina", "Universidade do Estado de Santa Catarina" ]

scl/1516-1439/S1516-14392022000100228.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100228

10.1590/1980-5373-mr-2021-0341

ENGINEERING, CHEMICAL

Universidade Federal Fluminense

null

Effect of Shot Peening Treatment on Residual Stress and Magnetic Barkhausen Noise of AISI 201LN and AISI 304L Stainless Steels

Souza, Marcel Freitas de

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract This work evaluates microstructural changes and residual stresses on surface samples of AISI 201LN and 304L subjected to shot peening. The residual stresses were measured by X‑ray diffraction and magnetic Barkhausen noise (MBN) in different shot-peened conditions. The results showed that the 201LN steel presented more martensite than the 304L steel in the initial condition, but with lower δ‑ferrite contents. These ferromagnetic phases were present in a low amount with high tensile residual stresses due to brush cleaning and light cold‑rolling in the final stage of the fabrication process. The shot peening process promoted compressive residual stresses mainly in the δ‑ferrite. However, some “fresh” martensite exhibited tensile residual stress represented by higher and thinner peaks, which together with the low-intensity amplitude in the neighborhood, represented all formed martensite. Thus, small microstructural changes provoked high residual stresses behavior, which can be detected in ferromagnetic phases by MBN.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100228&lng=en&tlng=en

41

scielo_articles/scl/1516-1439/S1516-14392022000100228.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Souza, Marcel Freitas de", "Pardal, Juan Manuel", "Igreja, Hugo Ribeiro da", "Padovese, Linilson Rodrigues", "Fonseca, Maria Cindra" ]

null

[ "201LN steel", "304L steel", "Residual stress", "X-ray diffraction", "Barkhausen noise" ]

null

[ "Universidade Federal Fluminense", "Universidade de São Paulo" ]

scl/1516-1439/S1516-14392022000100219.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100219

10.1590/1980-5373-mr-2021-0365

ENGINEERING, CHEMICAL

Universidade Federal do Paraná

null

Microfiltration of Oil-in-water Emulsion Using Modified Ceramic Membrane: Surface Properties, Membrane Resistance, Critical Flux, and Cake Behavior

Melo, William de

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Previous studies have demonstrated the improved membrane properties of ceramic membranes made from thermally modified clays with cationic manioc starch and eggshell residue as additives. Based on the employment of these membranes, the relationship between thermally modified clays’ structure and cross-flow microfiltration using oil-in-water emulsion was studied (North Sea heavy crude oil). Using raw clay (M1) and thermally pretreated clay (M2), tubular ceramic membranes were prepared by the extrusion method. Critical Flux in different concentrations (250, 500, and 1000 mgL−1), fouling mechanisms, and membrane resistance were analyzed. The initial membrane resistance values for M1 and M2 membranes were 2.23 ± 0.32 × 1012 m−1 and 1.72 ± 0.293 × 1012 m−1, respectively. The membrane resistance was reduced by 22% due to the clay modification, which also decreased the contact angle, increased the pore size, and decreased the membrane roughness. Regarding the total organic carbon removal, the M2 membrane had no loss in separation efficiency despite having a slightly larger pore size. These results indicate that the clay-induced structural changes decreased the membrane resistance and improved the permeate flux but did not decrease the oil-in-water emulsion’s separation efficiency.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100219&lng=en&tlng=en

51

scielo_articles/scl/1516-1439/S1516-14392022000100219.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Melo, William de", "Lesak, Giuliana Varela Garcia", "Oliveira, Thamayne Valadares de", "Voll, Fernando Augusto Pedersen", "Santos, Alexandre Ferreira", "Vieira, Rafael Bruno" ]

null

[ "oil-in-water emulsion", "ceramic membrane", "microfiltration", "thermal pre-treatment" ]

null

[ "Universidade Federal do Paraná", "Universidade Federal de Uberlândia" ]

scl/1516-1439/S1516-14392022000100336.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100336

10.1590/1980-5373-mr-2022-0075

ENGINEERING, CHEMICAL

Universidade Federal de São Carlos

null

Modeling and Analysis of the Plastic Flow Curves of a Duplex Stainless Steel Using Artificial Intelligence

Contini Jr., Leones

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Determining the flow stress curves of metals and alloys in hot working conditions is essential for designers of metals forming processes. In this research, samples of a super duplex stainless steel with a ferrite matrix and dispersed austenite particles were deformed by torsion tests at temperatures ranging from 900 °C to 1200 °C and strain rates from 0.01 s-1 to 10 s-1. The level and shape of the plastic flow stress curves depend on the temperature and the strain rate and varies with the austenite volume fraction. When the two phases are deformed together, the marked difference in the softening behavior of austenite and ferrite leads to the uneven strain partitioning between these phases. As a consequence, the plastic behavior of this biphasic material is more complex than that of a single-phase material. A four columns spreadsheet was built using the experimental data obtained from the hot deformation testing. The first three columns contain the input data attributes (temperature, strain rate and strain) and the fourth the strength (stress) resulting from the material during deformation. These data were submitted to machine learning algorithms; initially in an artificial neural network with one hidden layer (ANN) and subsequently to a neural network with a specialist system (ANFIS). After the machine learning processes, the plastic flow curves were rebuilt and compared with those obtained experimentally. The ability of both algorithms to rebuilt the plastic flow curves of the super duplex stainless steel were associated with changes in the shapes of the flow curves and microstructure evolution.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100336&lng=en&tlng=en

39

scielo_articles/scl/1516-1439/S1516-14392022000100336.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Contini Jr., Leones", "Balancin, Oscar" ]

null

[ "Duplex Stainless Steel", "Modeling Flow curves", "Artificial Intelligence", "Machine learning" ]

null

[ "Universidade Federal de São Carlos" ]

scl/1516-1439/S1516-14392022000100334.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100334

10.1590/1980-5373-mr-2021-0621

ENGINEERING, CHEMICAL

Centro Federal de Educação Tecnológica de Minas Gerais

null

Characterization of Magnetic Tailings from Phosphate-Ore Processing in Alto Paranaíba

Silva, Fernando Brandão Rodrigues da

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

The characterization studies of tailings from mining are crucial for the development of its reuse processes and the reduction of impacts caused by its conditioning on the earth’s surface. This study characterizes the magnetic tailings from phosphate-rock processing using X-ray diffraction, X-ray fluorescence spectrometry and quantitative electron microscopy techniques. Samples were obtained from the magnetic tailings deposit of a mining company in the Alto Paranaíba region, Minas Gerais. The tailings are mainly composed of hematite/magnetite (74.92%), ilmenite (8.91%), fluorapatite (8.8%), anatase (3.07%), calcite (1.67%), goethite (1.62%), and quartz (1.02%). The particle size of the tailings is smaller than that specified for the production of sinter feed. The hematite/magnetite phase is strongly associated with ilmenite and fluorapatite. New stages of comminution and separation are needed due to the low degree of liberation of these minerals for a possible reuse of the components.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100334&lng=en&tlng=en

33

scielo_articles/scl/1516-1439/S1516-14392022000100334.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Silva, Fernando Brandão Rodrigues da", "Araújo, Fernando Gabriel Silva", "von Krüger, Fernando Leopoldo", "Silva, Guilherme Jorge Brigolini", "Batista, Ronaldo Junio Campos", "Manhabosco, Taíse Matte" ]

null

[ "Magnetic tailing", "Characterization", "QEM" ]

null

[ "Centro Federal de Educação Tecnológica de Minas Gerais", "Universidade Federal de Ouro Preto", "Fundação Gorceix", "Universidade Federal de Ouro Preto" ]

scl/1516-1439/S1516-14392022000100327.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100327

10.1590/1980-5373-mr-2021-0594

ENGINEERING, CHEMICAL

Universidade de São Paulo

null

Oxide Formation in a Melt Spun Alloy in the Zr-Ni-Cu System

Campos Neto, Nelson Delfino de

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

The microstructure of a melt-spun Zr28Ni44Cu28 (at. %) alloy was characterized in order to determine the structures and compositions of the crystalline phases that compete with glass formation during rapid solidification. Two crystalline phases were identified, namely, a face centered cubic (FCC) zirconium oxide phase and a primitive cubic version of the big-cube oxide phase, using a combination of scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and transmission electron microscopy techniques. Our results indicate that the Zr-O atomic pair interaction is preferential compared to the other atomic pair possibilities, supporting the formation of Zr-based oxides over the equilibrium phases in the ternary Zr-Ni-Cu system. Further, the results provide insight into the mechanisms of oxygen-induced crystallization in Zr-based BMGs and the corresponding decrease in glass forming ability (GFA) with increasing oxygen concentrations.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100327&lng=en&tlng=en

34

scielo_articles/scl/1516-1439/S1516-14392022000100327.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Campos Neto, Nelson Delfino de", "Deo, Leonardo Pratavieira", "Mendes, Marcio Andreato Batista", "Kaufman, Michael Joseph", "Oliveira, Marcelo Falcão de" ]

null

[ "Metallic glass", "Zr-Ni-Cu system", "zirconium oxide", "big-cube" ]

null

[ "Universidade de São Paulo", "Colorado School of Mines", "Universidade Federal de Lavras", "Universidade Tecnológica Federal do Paraná" ]

scl/1516-1439/S1516-14392022000100333.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100333

10.1590/1980-5373-mr-2022-0017

ENGINEERING, CHEMICAL

Higher Institute for Applied Sciences and Technology

null

Investigation of Laser Damage Thresholds of an Output Coupler for TEA CO2 Laser

Lababidi, Mohamad Nour

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Output couplers for TEA CO2 lasers were made from Ge substrate coated with dielectric layers of ZnS, Ge and Y2O3 using physical evaporation technique (PVD). The laser-induced damage thresholds (LIDTs) of manufactured mirrors have been investigated using an experimental setup, based on TEA CO2 laser. The effect of preparation conditions, such as grinding, polishing and cleaning, is shown. The maximum value of LIDT about 8 J/cm2 was achieved using a fine grinding with loose abrasive grade 3 µm, then polishing with alumina powder grade 0.3 µm and finally hot cleaning with ultrasonic waves.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100333&lng=en&tlng=en

24

scielo_articles/scl/1516-1439/S1516-14392022000100333.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Lababidi, Mohamad Nour", "Mayya, Khaled" ]

null

[ "Laser-induced damage thresholds", "optical materials", "coupler mirrors", "CO2 laser" ]

null

[ "Higher Institute for Applied Sciences and Technology" ]

scl/1516-1439/S1516-14392022000100332.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100332

10.1590/1980-5373-mr-2022-0173

ENGINEERING, CHEMICAL

PSG College of Technology

null

Development and Experimental Investigation of Pigeon Pea Stalk Particle Reinforced Epoxy Composites and their Hybrid Composites for Lightweight Structural Applications

Pujar, Nagaraj Malleshappa

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The pigeon pea (PP) stalk is a sustainable lignocellulosic material left by the farmers after harvesting its pulses. The use of agricultural residue in the development of polymer composites is a step towards sustainability. This study focuses on developing and characterizing the mechanical properties (the tensile, flexural, interlaminar shear, compression, impact, and hardness) of less utilized agro-based PP stalk particle reinforced epoxy composites and their hybrid composites. In addition, the density, dynamic mechanical analysis, water absorption, and morphology were also investigated for a better understanding of these composites. In comparison to other agro-residue reinforced composites, PP stalk particles (up to 20 wt.%) reinforced epoxy composites have demonstrated comparable mechanical, viscoelastic, and water absorption characteristics. Jute/PP/epoxy and glass/PP/epoxy hybrid composites outperformed PP/epoxy composites in mechanical, dynamic, and water absorption characteristics. The ranking of the composites based on the characterization was done using the TOPSIS method, and glass/PP/epoxy composite with a 20 wt.% was identified as the best performer among all the composites. The results demonstrated that PP stalk particle reinforced composites are a viable alternative to wood and other natural fiber-based composites and could be used in lightweight structural applications such as automotive interiors, furniture, packaging containers, and cascading applications.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100332&lng=en&tlng=en

46

scielo_articles/scl/1516-1439/S1516-14392022000100332.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Pujar, Nagaraj Malleshappa", "Mani, Yuvaraja" ]

null

[ "Agro-residue", "mechanical properties", "dynamic mechanical analysis", "hybrid composites", "TOPSIS" ]

null

[ "PSG College of Technology" ]

scl/1516-1439/S1516-14392022000100331.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100331

10.1590/1980-5373-mr-2021-0383

ENGINEERING, CHEMICAL

Universidade de São Paulo, Escola de Engenharia de São Carlos

null

Interfacial Bonding Strength in Cement Mortar Beams Reinforced with Metamaterial Bars

Ramírez, C. Q.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Reinforced concrete beam (RCB) elements show low mechanical performance when interfacial bonding strength (IBS) is not well controlled. New tailorable material-structure arrangements - Metamaterials - offer solutions to the IBS problem. This paper analyzes the mechanical characteristics of IBS on RCBs for reinforced cement mortar containing Metamaterial bars (MMB) that were machined from SAE 1020 Carbon steel. Each MMB has a stepped geometrical shape, with a cylindrical bar divided into equal-length segments, along with a ’rise height’ (p) change. Four geometries were defined, i.e., R0− Smooth bar, R1− p = 0.1mm, R2− p =0.3mm and R3− p=0.5mm. Three-point flexural strength tests were performed on the RCBs to determine the maximum bond strength (ML) between the MMB and cement mortar. Images of interfacial regions were obtained using SEM and 3D Roughness Reconstruction software to calculate the average roughness (Ra) and the roughness height (Rz). The reinforcement MMB geometry had a significant impact on the ML results, particularly on the first crack strength and the failure mode. The R3 geometry ML values were higher than the other tested geometries (44.5%). The results of the scale models are encouraging and offer a novel and prospective direction for further experimental and even numerical Metamaterial research to improve interfacial bond strength.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100331&lng=en&tlng=en

37

scielo_articles/scl/1516-1439/S1516-14392022000100331.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Ramírez, C. Q.", "Santos, C. V. S.", "Gonçalves, P. C.", "Gelfuso, M. V.", "Santos, V. C.", "Sánchez, J. A. G." ]

null

[ "Interfacial bonding strength", "metamaterial", "concrete" ]

null

[ "Universidade de São Paulo, Escola de Engenharia de São Carlos", "Universidade Federal de Itajubá", "Universidade Federal de Itajubá", "Universidade Federal de Itajubá" ]

scl/1516-1439/S1516-14392022000100330.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100330

10.1590/1980-5373-mr-2021-0598

ENGINEERING, CHEMICAL

Universidade Federal do Rio Grande do Sul

null

Numerical and Experimental Study of an Industrial Case for Grain Size Evolution in Bainitic Steel in Controlled Hot Forging and its Influence on Mechanical Performance

Ivaniski, T.M.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Controlling the recrystallization is an important way to reach grain size refinement and outstanding strength and toughness on alloy metals. This study sets out the application and investigation of mathematical microstructure modeling of a newly designed bainitic steel for hot forging industrial applications. The macro-scale model was used to observe and predict the austenitic grain size behavior during the controlled forging of a gear. Arrhenius grain growth kinetic and recrystallization model for a new class of bainitic steel was established for the given strain rate ranges and temperatures. This model was calibrated through microscopic analysis and used to simulate the unpublished constants of low alloyed bainitic forging steel DIN 18MnCrSiMo6-4 microstructure module using DEFORM® commercial finite element code. The increased temperature due to the adiabatic effect was investigated by numerical analysis, demonstrating its influence on grain coarsening. Local tensile test and Charpy-V notch were compared at different industrial hot forging temperatures and local plastic strain. Changes in yield strength and ductility have demonstrated the grain size influence on the processing parameters. The employed numerical model was an efficient tool to predict and present an alternative path to develop robust industrial forging using semi-empirical models.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100330&lng=en&tlng=en

34

scielo_articles/scl/1516-1439/S1516-14392022000100330.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Ivaniski, T.M.", "Castro, P.J. de", "Rodrigues, D.", "Épp, J.", "Nunes, R.M.", "Rocha, A. da S." ]

null

[ "Hot Forging", "Grain Size", "JMAK", "Mechanical Properties", "Bainitic Steel" ]

null

[ "Universidade Federal do Rio Grande do Sul", "Leibniz-Institut für Werkstofforientierte Technologien", "University of Bremen" ]

scl/1516-1439/S1516-14392022000100329.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100329

10.1590/1980-5373-mr-2022-0021

ENGINEERING, CHEMICAL

Universidade Federal da Bahia

null

Effect of Glycerol Addition on Copper Electrodeposition on Steel Substrate

Barbosa, Rafael Santos

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract This work investigates the effect of the addition of glycerol on the microstructure, corrosion resistance, and efficiency of the electrodeposition process of Cu coating in an acid sulphate solution. The morphology and microstructures of electrodeposits were analyzed using Scanning Electron Microscopy (SEM), Spectrometry X-Ray Diffraction (XRD) and laser scanning confocal microscopy (LSCM). Evaluation of the corrosion resistance was performed in 2.0 mol⋅L−1 NaCl by means of weight loss tests and electrochemical techniques. The addition of glycerol resulted in a decrease in grain and crystallite sizes, a decrease in roughness and an increase in the tensile strain of the coating. The deposition efficiency and the corrosion resistance increased with the addition of glycerol exhibiting a maximum value at the concentration of 0.42 mol⋅L−1, increasing the efficiency of electrodeposition by approximately 96%. This is related to the roughness of the coating, which is minimal at this concentration.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100329&lng=en&tlng=en

45

scielo_articles/scl/1516-1439/S1516-14392022000100329.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Barbosa, Rafael Santos", "Koga, Guilherme Yuuki", "Nascimento, Marcio Luis Ferreira", "Souza, Carlos Alberto Caldas de" ]

null

[ "Cu coating", "glycerol", "electrodeposition", "corrosion" ]

null

[ "Universidade Federal da Bahia", "Universidade Federal de São Carlos" ]

scl/1516-1439/S1516-14392022000100328.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100328

10.1590/1980-5373-mr-2021-0602

ENGINEERING, CHEMICAL

Prince of Songkla University

null

Insight into Mechanical Properties and Strain-induced Crystallisation of Epoxidized Natural Rubber Filled with Various Silanized Halloysite Nanotubes

Masa, Abdulhakim

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Natural rubber (NR) and halloysite nanotube (HNT) composites are known to perform poorly due to polarity differences between the two components. As such, many extant studies have attempted to increase their compatibility. Therefore, this study introduced epoxidized natural rubber (ENR) together with silane coupling agents into the composite to ensure rubber-filler interactions. Four different silanes namely bis-[(triethoxysilyl)propyl] disulphide (TESPD), bis[(triethoxysilyl)propyl] tetrasulfide (TESPT), triethoxyvinylsilane (VTEO), and 3-mercaptopropyl-di(tridecan-1-oxy-13-penta(ethyleneoxide)) ethoxysilane (VPSi-363) were used. Fourier-transform infrared (FTIR) spectroscopy of the composite confirmed the formation of hydrogen bonds between the silane as the peak of Si-O shifted to higher wavenumbers; i.e., 1080 cm-1 to 1042 cm-1. Silane was also found to improve the tensile strength, modulus and tear strength regardless of functionality. This was further supported by the findings of the Payne effect. As for strain-induced crystallisation (SIC), the stress-strain curves agreed well with the development of crystallinity observed during synchrotron wide-angle X-ray scattering analysis.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100328&lng=en&tlng=en

39

scielo_articles/scl/1516-1439/S1516-14392022000100328.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Masa, Abdulhakim", "Hayeemasae, Nabil" ]

null

[ "Epoxidized natural rubber", "Halloysite nanotubes", "Silane coupling agent", "Mechanical properties", "Wide-angle X-ray scattering" ]

null

[ "Prince of Songkla University", "Prince of Songkla University" ]

scl/1516-1439/S1516-14392022000100309.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100309

10.1590/1980-5373-mr-2021-0582

ENGINEERING, CHEMICAL

Institut Teknologi Bandung

null

Improving Microwave Response Performance through Involvement of Gadolinium Dopant into Yttrium Iron Garnet

Subawi, Handoko

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

In this study, the influence of gadolinium dopant composition on the microwave response performance of yttrium iron garnet was investigated. A hydraulic pressing was used to create the ferrite garnet sample. As the test material, pure oxide powder with an average grain size of 1 micron was employed. A pressure force of 700 MPa was used to compact the sample pellets. The sintering process was carried out in a high-temperature tube furnace at 1450 oC for five hours. This research shows that the calculated findings match the experimental data, demonstrating that the addition of gadolinium reduces the total magnetic moment and insertion loss of yttrium iron garnet. Adding 14 to 25% mol of gadolinium to one mol of iron oxide resulted in an insertion loss value near to zero, according to the calculations. To validate this calculation value, the microwave response of a sample of yttrium iron garnet with 15% mol of gadolinium doping was measured at frequency 4 GHz, yielding an insertion loss parameter value of 0.25 dB, which has a crucial function in lowering the insertion loss value of yttrium iron garnet.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100309&lng=en&tlng=en

29

scielo_articles/scl/1516-1439/S1516-14392022000100309.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Subawi, Handoko", "Soepriyanto, Syoni", "Korda, Akhmad Ardian", "Prijamboedi, Bambang", "Suhendar, Dadan" ]

null

[ "Dopant", "Gadolinium", "Insertion loss", "Microwave response", "Sintering" ]

null

[ "Institut Teknologi Bandung", "Institut Teknologi Bandung", "Institut Teknologi Bandung" ]

scl/1516-1439/S1516-14392022000100307.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100307

10.1590/1980-5373-mr-2021-0233

ENGINEERING, CHEMICAL

Universidade Estadual Paulista Júlio de Mesquita Filho

null

Evaluation of the Physical and Biological Properties of Ti-34Nb-6Sn/Mg Alloy Obtained by Powder Metallurgy for Use as Biomaterial

Rossi, Mariana Correa

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Ti-34Nb-6Sn alloy were prepare by powder metallurgy milled in two different times (40 and 60 min) using Ti and Nb hydrides with or without Mg, as spacer then sintered at 700ºC and 800ºC. Characterizations were made by scanning electron microscope (SEM), X-ray diffractometer (XRD) and by Archimedes. Microhardness was measured by Vickers microhardness. Mesenchymal stem cells derived from equine bone marrow (BMMSCs) were used to evaluate the sample cytotoxicity. Hydration and dehydration process was confirmed, also the formation of brittle particles during the milling. Materials were structured under α and β phase, and the samples that received Mg as a spacer had slightly lower β phase content compared to samples without Mg, suggesting difficult α→β transformation due to the presence of barriers formed by pores. Mg provided greater porosity, and prepared milled in a shorter time promoted an increase in the macropores. Microhardness was similar to that of commercial materials (i.e., CP-Ti and also to other alloys with similar nominal composition. Cells treated with conditioned medium with the samples showed viability comparable to the control group, and after 48 h of culture on the samples, there was significant growth and more circular morphology, when adhered on materials that received Mg.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100307&lng=en&tlng=en

74

scielo_articles/scl/1516-1439/S1516-14392022000100307.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Rossi, Mariana Correa", "Stievani, Fernanda de Castro", "Pfeifer, João Pedro Hübbe", "Martinez, Luis Gallego", "Borrás, Vicente Amigó", "Saeki, Margarida Juri", "Alves, Ana Liz Garcia" ]

null

[ "β titanium alloy", "High energy milling", "Biocompatibility", "Biomedical implant" ]

null

[ "Universidade Estadual Paulista Júlio de Mesquita Filho", "Universitat Politècnica de València", "Universidade de São Paulo", "Universidade Estadual Paulista Júlio de Mesquita Filho" ]

scl/1516-1439/S1516-14392022000100273.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100273

10.1590/1980-5373-mr-2021-0484

ENGINEERING, CHEMICAL

Universidade Federal de Pernambuco

null

Effect of Electrodeposition Time on Absorptance, Roughness and Thermal Stability of Black Chromium Absorbing Surfaces

Medeiros, João Victor Furtado Frazão de

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Solar thermal energy is one of the ways of using solar radiation that can be applied to meet the energy needs for heating. To achieve efficient photothermal conversion, selective surfaces are applied to solar collectors to absorb more radiation and minimize heat loss. The present work produced absorber surfaces from black chromium electrodeposition on stainless steel substrate, the main parameter evaluated was the deposition time and its effect on optical and morphological properties. In this sense, the techniques of characterization UV-Vis-NIR Spectroscopy, Infrared Spectroscopy, X-Ray Diffraction, Optical Profilometry and Thermogravimetric analysis were used. It was observed a great influence of the electrodeposition time in the absorptance of the films, where films with deposition times of 2 to 10 minutes obtained absorptances greater than 92%. The metallic Cr phase was identified in the films, and it is estimated that chromium oxides may have been formed in the amorphous form. With increasing time, the roughness oscillated due to the constant nucleation of chromium throughout the process. Furthermore, a 5% mass loss indicates good thermal stability of the film up to 400 °C.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100273&lng=en&tlng=en

19

scielo_articles/scl/1516-1439/S1516-14392022000100273.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Medeiros, João Victor Furtado Frazão de", "Oliveira, Aline da Silva", "Galvão, Gabriela Oliveira", "Medeiros, Ithyara Dheylle Machado de", "Gomes, Kelly Cristiane" ]

null

[ "Solar thermal energy", "Absorber films", "Black Chromium", "Electrodeposition" ]

null

[ "Universidade Federal de Pernambuco", "Universidade Federal de Paraiba", "Universidade Federal da Paraiba", "Universidade Federal de Paraiba" ]

scl/1516-1439/S1516-14392022000100281.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100281

10.1590/1980-5373-mr-2021-0422

ENGINEERING, CHEMICAL

Instituto Tecnológico de Aeronáutica

null

High-quality Finishing Process for Silicon Carbide Optical Components Using Conventional Equipment

Santos, Marcos Valentim Ribeiro dos

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The development of low-cost high quality surface finishing methods for silicon carbide (SiC) is an arduous task. Nowadays, the SiC mirrors manufacture involves extensive, complex, and costly finishing processes carried out on highly expensive ultra-precise machines. In this work, a cost-effective surface finishing method has been successfully developed, using conventional machines for the optical finishing of SiC. The results showed that the combination of ductile grinding and polishing in conventional low-cost machines allowed to obtain high-quality surface finish on SiC substrates with low roughness (4 - 10 nm Ra ) and optical figure in the range λ / 4 - λ / 8, at a reduced 32 hours total processing time.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100281&lng=en&tlng=en

24

scielo_articles/scl/1516-1439/S1516-14392022000100281.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Santos, Marcos Valentim Ribeiro dos", "Damião, Alvaro José", "Abdalla, Antonio Jorge" ]

null

[ "Silicon carbide", "machining", "polishing", "roughness", "optical figure" ]

null

[ "Instituto Tecnológico de Aeronáutica", "Instituto de Estudos Avançados" ]

scl/1516-1439/S1516-14392022000100287.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100287

10.1590/1980-5373-mr-2021-0610

ENGINEERING, CHEMICAL

Shandong Jianzhu University

null

Influence of Filler Alloy on Microstructure and Properties of Induction Brazed Al/Cu Joints

Wang, Xuegang

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

This work aimed to clarity the influence of filler alloy on microstructures and properties of induction brazed Al/Cu joints. It was found that the alloying elements in the filler alloy changed the morphology and phase type of interfacial layer in the joint. Mg converted the native Al2O3 film into MgO and stopped the re-oxidation of aluminum. However, excessive Mg caused planar inter-metallic compounds (IMCs) to become wavy, which decrease the ductility of the joint. A suitable amount of Cu and Si removed residual oxide film and resulted in a thin planar IMCs layer, which is beneficial to Al/Cu joint. Al-8Si-4Cu-2Mg-1Ga-0.05Ce filler foil produced an excellent joint consisting of a 2μm Cu9Al4/CuAl2 planar layer and free from oxide film. The tensile strength of the joint is higher than that of aluminum. The bend angle is higher 130°. The electrical resistivity of the joint is lower than the theoretical value.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100287&lng=en&tlng=en

54

scielo_articles/scl/1516-1439/S1516-14392022000100287.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Wang, Xuegang", "Chen, Xianjing", "Yuan, Xingdong" ]

null

[ "Copper", "aluminum", "induction brazing", "inter-metallic compound", "filler alloy" ]

null

[ "Shandong Jianzhu University", "Shandong Institute for Product Quality Inspection" ]

scl/1516-1439/S1516-14392022000100286.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100286

10.1590/1980-5373-mr-2021-0593

ENGINEERING, CHEMICAL

Centro Universitário da Fundação Educacional Inaciana "Padre Sabóia de Medeiros"

null

Computational Simulation of Duplex Stainless Steel Continuous Cooling Transformation Curves Using DICTRA®

Andrade, Rayanne Araujo

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Despite of their excellent combination of high mechanical strength, toughness and corrosion resistance, duplex stainless steels (DSS) are susceptible to sigma phase formation, negatively affecting their superior properties. Sigma formation continuous cooling transformation (CCT) diagrams can be a useful tool to avoid sigma formation during cooling from solution treatment temperatures; however, non-isothermal information about sigma formation in DSS are scarce in literature. This work presents a methodology to simulate CCT diagrams in DICTRA® software, showing excellent adherence to literature data. The methodology here presented was also able to describe sigma phase formation behaviour for different DSS compositions.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100286&lng=en&tlng=en

28

scielo_articles/scl/1516-1439/S1516-14392022000100286.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Andrade, Rayanne Araujo", "Magnabosco, Rodrigo" ]

null

[ "Computation simulation", "stainless steel", "sigma phase", "CCT", "DICTRA" ]

null

[ "Centro Universitário da Fundação Educacional Inaciana \"Padre Sabóia de Medeiros\"" ]

scl/1516-1439/S1516-14392022000100285.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100285

10.1590/1980-5373-mr-2021-0526

ENGINEERING, CHEMICAL

Northern Technical University

null

Structure, Characteristics and Corrosion Behaviour of Gold Nanocoating Thin Film for Biomedical Applications

Wadullah, Haitham M.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Nanocoatings thin films are layers deposited to improve required properties and corrosion resistance as a major objective for materials that are used for various biomedical applications such as biosensors. In this study, Gold (Au) thin films with 50 nm and 100 nm have been synthesized on Ni-Cr-Mo alloys by magnetron sputtering deposition technique. X-Ray diffraction (XRD), Atomic Force Microscopy (AFM), and Energy-dispersive X-Ray spectroscopy /Scanning Electron Microscopy (EDS/SEM ) have been used to distinguish the surfaces morphology. The results showed that there is no defects or micro-cracks with a uniform and homogenous film. It has spherical nanoparticles diameter morphology with 200-400 nm shaped to fine aggregation. The roughness average (Ra) decreased from 3.91 nm for 50 nm films to 3.70 nm for 100nm films with FCC crystal structure (111) for gold thin films. In vivo, after 50 nm and 100 nm nanocoated thin film by gold, a significant improvement in the localized corrosion resistance has been obtained in artificial saliva corrosive media at 37 °C compared with the uncoated surface.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100285&lng=en&tlng=en

21

scielo_articles/scl/1516-1439/S1516-14392022000100285.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Wadullah, Haitham M.", "Ali, Mohammed Hadi", "Abdulrazzaq, Tariq Khalid" ]

null

[ "Corrosion resistance", "sputtering deposition process", "gold thin films", "Ni-Cr-Mo biomaterial alloy" ]

null

[ "Northern Technical University", "Middle Technical University" ]

scl/1516-1439/S1516-14392022000100284.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100284

10.1590/1980-5373-mr-2021-0455

ENGINEERING, CHEMICAL

Universidade Federal do Rio Grande do Sul

null

Thermal Degradation Kinetics and Lifetime Prediction of Cellulose Biomass Cryogels Reinforced by its Pyrolysis Waste

Lazzari, Lídia K.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Degradation kinetics is an important tool in order to understand and improve energy conversion and the final application of a material. Cellulose cryogels (CC) are a new class of materials that can be reinforced by several types of particle, including biochar. Apart from it, degradation kinetics and lifetime prediction of biomass cellulose cryogels reinforced by cellulose pyrolysis waste (BC) has been investigated using TG techniques and iso-conversional model free methods. Additionally, the same study was applied to cellulose cryogels reinforced by graphene nanoplatelets (NPG) to compare the behavior of a filler from waste (BC) and a noble filler (NPG). Furthermore, the influence of the addition of the fillers into the cellulose biomass were evaluated in terms of thermal stability and crystallinity. BC and GNP led to higher values of activation energies ( E a) calculated from model-free isoconversional methods and all samples degraded in two-steps. Finally, lifetime prediction was successfully applied and the CC cryogel became more stable over time, maintaining almost 80% of the mass for 1 year exposed at 180 °C. The results of this study shown that only cellulose biomass cryogels are more suitable to produce thermal insulators due to it higher thermal stability.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100284&lng=en&tlng=en

52

scielo_articles/scl/1516-1439/S1516-14392022000100284.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Lazzari, Lídia K.", "Neves, Roberta M.", "Vanzetto, Andrielen B.", "Zattera, Ademir J.", "Santana, Ruth M. C." ]

null

[ "Cryogels", "biochar", "graphene nanoplatelets", "cellulose", "degradation kinetics" ]

null

[ "Universidade Federal do Rio Grande do Sul", "Pontifícia Universidade Católica do Rio Grande do Sul", "Universidade de Caxias do Sul" ]

scl/1516-1439/S1516-14392022000100283.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100283

10.1590/1980-5373-mr-2021-0364

ENGINEERING, CHEMICAL

Universidade de São Paulo

null

Evaluation of a Mathematical Model Based on Lubanska Equation to Predict Particle Size for Close-Coupled Gas Atomization of 316L Stainless Steel

Silva, Flávia Costa da

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Close-Coupled Gas Atomization (CCGA) is often used to produce spherical metal powders with a wider Particle Size Distribution (PSD) (10 – 500 µm) compared to that required by the main Additive Manufacturing processes (10 – 105 µm). This work presents an accuracy evaluation of a mathematical model based on the Lubanska equation to predict the d50 for CCGA. Atomization experiments of 316L steel were conducted to evaluate the tip diameter and atomization gas pressure effects on PSD and, the d50 experimental results were used as the reference to the mathematical model evaluation. The mathematical model accuracy could be improved by: (i) considering the backpressure phenomenon for the metal flow rate calculation, since it was an important inaccuracy source; (ii) reviewing the tip diameter effect, which had a lower impact on d50 than that predicted by the Lubanska equation. The atomization gas pressure was the most influential parameter on d50 and d90 and the increase of the gas pressure led to a significant reduction in PSD and, consequently, increased yield.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100283&lng=en&tlng=en

51

scielo_articles/scl/1516-1439/S1516-14392022000100283.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Silva, Flávia Costa da", "Lima, Moysés Leite de", "Colombo, Giovanna Fiocco" ]

null

[ "close-coupled gas atomization", "additive manufacturing", "316L powder", "Lubanska equation", "process parameters" ]

null

[ "Universidade de São Paulo", "Instituto de Pesquisas Tecnológicas de São Paulo" ]

scl/1516-1439/S1516-14392022000100282.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100282

10.1590/1980-5373-mr-2021-0256

ENGINEERING, CHEMICAL

Universidade Federal Fluminense

null

Microstructural Evaluation of an Austempered Cast Iron Alloy

Pereira, Letyssia Niara De Godoi

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract ADI are the result of graphite nodules and ausferrite microstructure (acicular ferrite + retained austenite). Over the past few years, ADI has become an important material for engineering due to its excellent mechanical properties (outstanding ductility, high mechanical strength and good toughness) and low cost. It is known the discussion of process variables such as austempering time and temperature are extremely important for the microstructural and hardness study of these materials. Thus, in the present work, ADI cast iron was investigated under twelve different austenitic conditions, aiming to characterize the influence of the amount of austenite on the ferritic matrix on the mechanical property of hardness. The heat treatment parameters vary from three different times (40 min, 90 min and 180 min) under four temperatures (280ºC, 300 ºC, 320 ºC and 370ºC). Results show there is a decreasing of hardness linked to the increasing of retained austenite % volume. The greater amount of retained austenite % volume in the matrix was presented by sample A14, treated during 40 minutes under 370ºC and presenting 32.30% of this microconstituint. The amounts of each phase present in the studied materials were raised by quantitative metallography through the software Fiji-ImageJ, allowing a comparison of the results obtained by these two methods. Time differences on the austempering heating treatment did not show several implications on ADI microstructure. In addition, analyzes of the graphite nodules were performed.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100282&lng=en&tlng=en

24

scielo_articles/scl/1516-1439/S1516-14392022000100282.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Pereira, Letyssia Niara De Godoi", "Medeiros, Ronaldo Gomes de Castro", "Freitas, Patrícia Guimarães Monteiro de", "Silva, Camila Ferreira da", "Silva, Leonardo Martins da", "Leal, Ricardo Henriques" ]

null

[ "Austempered Ductile Iron – ADI", "Metallography", "Microstructure", "Thermal treatment" ]

null

[ "Universidade Federal Fluminense", "Pontifícia Universidade Católica do Rio de Janeiro" ]

scl/1516-1439/S1516-14392022000100280.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100280

10.1590/1980-5373-mr-2021-0117

ENGINEERING, CHEMICAL

Middle Technical University

null

Effect of Welding Parameters of Resistance Spot Welding on Mechanical Properties and Corrosion Resistance of 316L

Hassoni, Safaa M

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

The purpose of this research is to analyze the mechanical properties and corrosion resistance of spot welding of stainless steels AISI 316L using the process of resistance spot welding varying welding parameters with three level for each of welding parameter; welding current (A.), electrode Pressure (bar), squeeze time (s.), and welding time (s.). The welding current was (4500, 5500 and 6500) A, the electrode Pressure was (20, 30 and 40) bar, the squeeze time was (0.6, 0.8 and 1) Sec., and the welding time was (0.3, 0.6 and 0.9) Sec. The specimens were inspected by a tensile-shear test, corrosion test and the inspection of scanning electron microscope (SEM). The technique of design of the experiments (DOE) was utilized to examine the influence of the welding process parameters on the joint tensile-shear force. The results were analyzed by the DOE method to determine the optimum tensile-shear force, where can be obtained by utilizing the welding parameters by welding current 5500A, electrode pressure of 30 bar, squeeze time 0.8s., and welding time of 0.3s. The examination of SEM indicated that the increment of welding current and electrode pressure leads to increment pitting and corrosion rate.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100280&lng=en&tlng=en

32

scielo_articles/scl/1516-1439/S1516-14392022000100280.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Hassoni, Safaa M", "Barrak, Osamah Sabah", "Ismail, Muammar Ibrahim", "Hussein, Sabah Khammass" ]

null

[ "RSW", "Similar Stainless Steels", "DOE", "Corrosion Test", "SEM" ]

null

[ "Middle Technical University", "Middle Technical University" ]

scl/1516-1439/S1516-14392022000100289.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100289

10.1590/1980-5373-mr-2021-0475

ENGINEERING, CHEMICAL

Universidade do Estado de Santa Catarina

null

Oxide Layers Growth on AISI 1006 Steel through 'Asymmetric Bipolar Pulsed Plasma' Process

Fin, Paula

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The main problem in metal oxidation is the spalling and de-cohesion of the oxide layer, which results in delamination due to strong compressive stress gradient through the layer. Present paper proposes the use of a modified process named Asymmetric Bipolar Pulsed Plasma (ABiPPS) for plasma-oxidation treatment of low carbon steel AISI-1006 samples. Results show that the ABiPPS process ensures high plasma stability and enables the growth of uniform oxide layers (with thickness up to 6 µm) on metal surfaces. Plasma generated through bipolar asymmetric voltage pulses provides better control on surface bombardment through interspersed jets of ions and electrons, during the oxidation process. The control of intermittent ions and electrons bombardment (through voltage peaks up to 1.5 kV and period about 1µs), during plasma oxidation, make it possible to improve the adhesion between the oxide layer and the substrate, moreover the control of crystalline phases, such as hematite and magnetite.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100289&lng=en&tlng=en

28

scielo_articles/scl/1516-1439/S1516-14392022000100289.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Fin, Paula", "Recco, Abel A. C.", "Scholtz, Juliano Sadi", "Fontana, Luis C." ]

null

[ "oxide layer", "asymmetric bipolar pulsed plasma ABiPPS", "ion and electron bombardment" ]

null

[ "Universidade do Estado de Santa Catarina" ]

scl/1516-1439/S1516-14392022000100279.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100279

10.1590/1980-5373-mr-2021-0596

ENGINEERING, CHEMICAL

Universidade de Brasília

null

Lattice Strain of Zn-Mn Mixed Ferrite Nanocrystals in a Core-Shell Morpho-Chemical Structure

Martins, F. H.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

In this work, the crystalline structure, chemical composition, size, and morphology of core@shell nanoparticles based on Zn-Mn ferrite nanocrystals were investigated. These materials have been proposed as promising candidates for multifunctional applications in biomedicine, catalysis, environmental remediation, among others. Those properties were probed by using several experimental techniques such as Synchrotron X-Ray Diffraction, Energy-Dispersive X-ray Spectroscopy, Transmission Electron Microscopy and Selected Area Electron Diffraction. Results show that all synthesized nanoparticles present a single crystalline spinel phase without the appearance of undesirable byproducts. The nanoparticles present a non-stoichiometric Zn-Mn ferrite core, due to a Fe enrichment and a Zn loss with respect to the synthesis medium. The surface treatment of the nanoparticles induces a greater iron enrichment, which occurs at the nanoparticles surface without changing the crystalline structure. Finally, modifications in lattice parameters and strain suggest a contribution of the Mn2+ cations, mainly related to their easy oxidation in the synthesis route, which increases the structural vacancies of Mn-richer ferrites.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100279&lng=en&tlng=en

74

scielo_articles/scl/1516-1439/S1516-14392022000100279.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Martins, F. H.", "Pilati, V.", "Paula, F.L.O.", "Gomes, R.C.", "Perzynski, R.", "Depeyrot, J." ]

null

[ "Strain", "Mixed ferrite", "Nanocrystals", "Core-Shell", "Nanoparticles" ]

null

[ "Universidade de Brasília", "Sorbonne Université", "Universidade de Brasília", "Universidade Federal de Santa Catarina" ]

scl/1516-1439/S1516-14392022000100278.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100278

10.1590/1980-5373-mr-2021-0443

ENGINEERING, CHEMICAL

Pontifícia Universidade Católica do Rio de Janeiro

null

The Corrosion Process of an API 5L X80 Welded Joint in a System with Different pH and H2S Concentration

Carvalho, M. B. L.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The corrosion evaluation of steels in the oil and gas industry environments is a crucial issue because corrosion can cause economic and human losses. It is well known that H2S can be originated from different processes in the oil and gas industry, accelerating the corrosion process. The objective of this work was to evaluate the H2S corrosion resistance of an API 5L X80 steel and its welded joint obtained by submerged arc welding process (SAW). All tests were performed in an aerated 5% wt NaCl and thiosulphate aqueous solution. The H2S concentration, pH, weight loss, electrochemical tests, and microstructure were considered. The results obtained showed an increase of the corrosion rate values, with decreasing pH and increasing concentration of H2S generated by the thiosulphate. For the lowest H2S concentrations, the corrosion process was inhibited, due to the formation of a partially protective film on the samples’ surfaces. The heat affected zone (HAZ) showed severe localized corrosion attack which was attributed to the microstructural characteristics of this region.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100278&lng=en&tlng=en

29

scielo_articles/scl/1516-1439/S1516-14392022000100278.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Carvalho, M. B. L.", "Bott, I. S.", "Forero, A. B.", "Ponciano, J. A. C." ]

null

[ "Corrosion", "H2S", "API 5L X80", "Welded joint", "Electrochemical tests", "Weight loss tests" ]

null

[ "Pontifícia Universidade Católica do Rio de Janeiro", "Universidad Nacional de Colombia", "Universidade Federal do Rio de Janeiro" ]

scl/1516-1439/S1516-14392022000100277.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100277

10.1590/1980-5373-mr-2021-0260

ENGINEERING, CHEMICAL

Southwest Petroleum University

null

Micro-mechanism of Shear Strength and Water Stability Enhancement of Montmorillonite by Microwave Heating

He, Leping

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Microwave heating potentially reinforces the muddy intercalation to eliminate slope failure. Montmorillonite has the worst water resistance among the muddy intercalation components, which is a primary facet of inducing muddy intercalation failure. This study investigates the mechanism of shear strength and water stability enhancement of montmorillonite heated by the microwave oven and muffle furnace from room temperature to 800 °C. Results show that montmorillonite mineralogical evolution can be divided into three stages: room temperature-300 °C, 300-600 °C, and 600-800 °C. Microwave heating is more efficient in montmorillonite heat treatment than muffle furnace heating and makes the montmorillonite dehydroxylated earlier. It is worth noting that hot spots formed inside the montmorillonite specimens during the microwave heat treatment. Microwave significantly promotes the shear resistance of montmorillonite, where the maximum increases are 39.94% of cohesion at 600 °C and 20.54% of internal friction angle at 700 °C. This enhancement is due to the rough surfaces and large particles produced by dehydroxylation and Mg-Al spinel synthesis, and the significant degree of disorder state of MMT after dehydroxylation also plays a vital role. The microwave-heated montmorillonite over 500 °C presents good integrity in the water immersion test over 24 h. Considering the shear behavior and water stability, we believe the most reasonable heating interval for microwaves is 500-600°C.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100277&lng=en&tlng=en

35

scielo_articles/scl/1516-1439/S1516-14392022000100277.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "He, Leping", "Qiu, Jia", "Hu, Qijun", "Wang, Haoyu", "Feng, Shiqing", "Gu, Yucheng", "Zeng, Junsen" ]

null

[ "Montmorillonite", "Microwave heating", "Muffle furnace heating", "Shear behavior", "Water stability", "Microstructure" ]

null

[ "Southwest Petroleum University", "Chongqing University", "China Southwest Geotechnical Investigation & Design Institute Co., Ltd", "Southwest Petroleum University", "Southwest Petroleum University" ]

scl/1516-1439/S1516-14392022000100276.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100276

10.1590/1980-5373-mr-2021-0436

ENGINEERING, CHEMICAL

Universidade Federal de Sergipe

null

Surface Energy Changes Involved in Apatite Formation in Copper-Containing Bioactive Glasses

Duarte, Camila Miranda Fonseca

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The aim of this work was to use the Washburn capillary rise method to evaluate changes in surface energy promoted by the insertion of CuO in a 58S glass and its implication in bioactivity. The presence of CuO decreased the surface wettability by decreasing the Lewis acid-base component γSAB and increasing the Lifshitz-van der Waals component γSLW. The insertion of CuO also diminished the value of the electron donor parameter γS-; i.e., the number of negative groups. This was accompanied by a nonuniform apatite formation on the surface, likely because the presence of CuO-rich regions with lower electron donor values impaired the adsorption of Ca2+, preventing uniform apatite precipitation. Therefore, surface energy was extremely sensitive to small physical and chemical changes in the glass structure and the behavior of the electron donor parameter could be used as an adequate probe to predict glass bioactivity.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100276&lng=en&tlng=en

46

scielo_articles/scl/1516-1439/S1516-14392022000100276.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Duarte, Camila Miranda Fonseca", "Santos, Silmara Caldas", "Cruz, Luana Barbosa da", "Acchar, Wilson", "Santos, Euler Araujo dos" ]

null

[ "Washburn capillary rise", "surface energy", "bioactivity", "bioactive glass", "copper" ]

null

[ "Universidade Federal de Sergipe", "Universidade Federal do Rio Grande do Norte" ]

scl/1516-1439/S1516-14392022000100275.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100275

10.1590/1980-5373-mr-2021-0330

ENGINEERING, CHEMICAL

The Hebrew University of Jerusalem

null

Estimation of Specific Heat of BaTiO3 Crystals Derived from Relationship Between Uniaxial Pressure and Electric Field

Dul'kin, E.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Shifting the Curie temperature in dependence on both uniaxial pressure and electric field in BaTiO3 crystals was studied based on literature data. It was shown that both these dependences perfectly coincide when adjusting the scale. Based on coincidence of these dependencies a relationship between both an uniaxial pressure and an electric field when shifting the Curie temperature was established. The specific heat is calculated using this relationship.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100275&lng=en&tlng=en

10

scielo_articles/scl/1516-1439/S1516-14392022000100275.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Dul'kin, E.", "Roth, M." ]

null

[ "Curie temperature", "uniaxial pressure", "electric field", "specific heat" ]

null

[ "The Hebrew University of Jerusalem" ]

scl/1516-1439/S1516-14392022000100274.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100274

10.1590/1980-5373-mr-2021-0496

ENGINEERING, CHEMICAL

University of Kerbala

null

Fabrication of Spin Coater Device using Hematocrit Centrifuge with Vacuum Substrate Holder for Thin Film Deposition

Hameed, Ammar S.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract One of the most important thin film deposition techniques on a silicon, quartz or sapphire substrate in the world is the spin coating method. Hematocrit centrifuge was used to elaborately manufacture the spin coating machine from affordable materials without vibrations. The vacuum holder substrate in this system is used for substrate adhesion. This method provides a dimensionally free substrate with appropriate adhesion for sedimentation upon high-speed spinning. A platinum thin film was deposited on a fluorine-doped tin oxide glass (FTO) substrate with a specific concentration of hexa-chloro-platinic acid. Platinum thin films were investigated by Field Emission Scanning Electron Microscope (FESEM) and UV-Vis spectroscopy. FESEM displays successfully produced platinum thin films. The results showed a platinum film transmittance decrement with increasing of hexachloro-platinic acid content. Therefore, the suggested spin coater in this work can deposit platinum thin films with high transmittance up to (98 a.u.).

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100274&lng=en&tlng=en

27

scielo_articles/scl/1516-1439/S1516-14392022000100274.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Hameed, Ammar S.", "Madlool, Rajaa A.", "Ridha, Noor J.", "Hussein, Basheer M.", "Alosfur, Firas K. Mohamad", "Tahir, Khawla J." ]

null

[ "Spin coater", "vacuum holder substrate", "Platinum thin films" ]

null

[ "University of Kerbala", "University of Kerbala", "University of Kerbala", "University of Alkafeel" ]

scl/1516-1439/S1516-14392022000100290.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100290

10.1590/1980-5373-mr-2021-0414

ENGINEERING, CHEMICAL

Universidade Estadual de Ponta Grossa

null

Cryogenic and Room Temperature ECAP Consolidation of Blended Elemental Powders of Aluminum and Copper

Namur, Ricardo Sanson

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The effect of temperature was investigated on the consolidation of blended elemental powders of aluminum and copper by equal channel angular pressing (ECAP). Aluminum and Copper powders (1:1% vol.) were blended and consolidated in a 90° ECAP die at room (RT) and cryogenic temperatures (CT - ~77 K). ECAP samples were pressed until 4 passes at room temperature in route Bc. As a reference, a sample was obtained by conventional uniaxial pressing. The obtained results indicated a much denser (>99.5%) and harder structure by cryogenic ECAP. The hardness after one pass at CT was comparable with 4 passes at room temperature. Tensile tests performed at CT for materials with similar chemical composition showed a simultaneous increase in strength and ductility at CT, corroborating the results obtained by ECAP. The partial suppression of dynamic recovery and the activation and the transition between deformation mechanisms at CT, as well as stacking fault energies (SFE) of such metals, played an important role in these results. Copper presented a much higher capability of strain hardening than aluminum, due to its lower SFE and much lower homologous temperature. X-ray diffraction indicated a strong correlation between the variation of average microstrain and the variation of hardness on both metals. The results of this study demonstrated the great potential of the application of very low temperatures for the obtaining of deformation metal-metal composites.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100290&lng=en&tlng=en

55

scielo_articles/scl/1516-1439/S1516-14392022000100290.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Namur, Ricardo Sanson", "Azevedo, Maxwell Silva", "Izumi, Marcel Tadashi", "Aguiar, Denilson Jose Marcolino de", "Zilnyk, Kahl Dick", "Cintho, Osvaldo Mitsuyuki" ]

null

[ "Cryogenic deformation", "equal channel angular pressing", "powder consolidation", "deformation processed metal-metal composite" ]

null

[ "Universidade Estadual de Ponta Grossa", "Universidade Tecnológica Federal do Paraná", "Instituto Tecnológico de Aeronáutica" ]

scl/1516-1439/S1516-14392022000100306.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100306

10.1590/1980-5373-mr-2021-0522

ENGINEERING, CHEMICAL

Universidade do Estado de Santa Catarina

null

The Influence of the Molecular Architecture of the Peg: Ppg Triblock Copolymer on the Properties of Epoxy Nanocomposites

Silva, Bruna L.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract This work focuses on characterizing the role of different triblock copolymers on the dispersion of nanoparticles in an epoxy matrix and in the thermal and mechanical properties of the resulting nanocomposites, using Poly (ethylene glycol) - block-poly (propylene glycol) - block-poly (ethylene glycol) (PEG-b-PPG- b-PEG) with 30% PEG, and poly (propylene glycol) - block-poly (ethylene glycol) - block-poly (propylene glycol) (PPG-b-PEG-b-PPG) with 50% PEG. The nanoparticles employed have different geometries: carbon nanotubes, graphene nanoplatelets and carbon black (spherical). Both copolymers were miscible in epoxy. The results suggest that the copolymers viscosity may be interfering with the dispersion of the nanoparticles in the matrix: the PPG-b- PEG-b-PPG50% copolymer has a higher viscosity than the PEG b-PPG-b-PEG30%, which facilitates their dispersion and an increase in mechanical properties. The PEG fraction was an important factor in the dispersion of nanoparticles in the epoxy matrix. The higher the PEG content in the copolymer block, the greater the synergy shown in the mechanical properties, since the nanoparticles inhibited the plasticizing effect of the block copolymer.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100306&lng=en&tlng=en

47

scielo_articles/scl/1516-1439/S1516-14392022000100306.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Silva, Bruna L.", "Schuster, Marcia B.", "Becker, Daniela", "Coelho, Luiz A.F." ]

null

[ "Block copolymer", "nanocomposites", "dispersion", "nanoparticles", "epoxy" ]

null

[ "Universidade do Estado de Santa Catarina" ]

scl/1516-1439/S1516-14392022000100337.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100337

10.1590/1980-5373-mr-2022-0044

ENGINEERING, CHEMICAL

Universidade Estadual Paulista

null

Analysis of the Mechanical Properties of Anodized Al-Si Alloys

Regone, Natal Nerímio

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Aluminum alloys have been widely used in multiple applications, such as in civil construction and engine pistons. They are subjected to loads that may impair their mechanical properties. Thereby, this research aims to study the influence of anodization on the mechanical properties of alloy samples and evaluate the behavior of oxide films when subjected to tensile testing. The mechanical properties of specimens have been evaluated based on tensile and Knoop hardness tests, and strain, tensile strength, and modulus of elasticity of specimens have been determined based on the stress-strain curve. The morphology of oxide films was analyzed by scanning electron microscopy (SEM) and optical microscopy (OM). Results of anodized Al-Si alloys in both modes, i.e. pulsed and direct currents, were compared, and it was found that pulsed current was more efficient than direct current with respect to uniformity of the formed film, and that the anodization process can affect a few mechanical properties of samples. The tension testing results also revealed that the oxide film has been fractured perpendicularly towards traction. However, the oxide film hardness was not affected by the anodization mode (pulsed or direct currents). In addition, a heat treatment was efficient at improving the uniformity of anodic films.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100337&lng=en&tlng=en

34

scielo_articles/scl/1516-1439/S1516-14392022000100337.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Regone, Natal Nerímio", "Freire, Célia Marina Alvarenga", "Ballester, Margarita", "Mariano, Neide Aparecida", "Codaro, Eduardo Norberto", "Acciari, Heloisa Andréa" ]

null

[ "Anodization", "Al-Si alloys", "mechanical properties", "hardness" ]

null

[ "Universidade Estadual Paulista", "Universidade Estadual de Campinas", "Universidade Federal de Alfenas", "Universidade Estadual Paulista" ]

scl/1516-1439/S1516-14392022000100226.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100226

10.1590/1980-5373-mr-2021-0433

ENGINEERING, CHEMICAL

Universidade Estadual de Campinas

null

Production Process of an Eco-Friendly One-Part Alkali-Activated Binder

Geraldo, Rodrigo H.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract One-part alkali-activated binder (AAB) is a product with lower environmental impact than Portland cement, and can be a feasible commercial alternative. The main objective of this study was to propose and test a method of obtaining one-part AAB with metakaolin and an alternative powder sodium silicate from rice husk ash (RHA). To evaluate the AAB properties, mortars were produced with different SiO2/Al2O3 molar ratios (2.7, 3.1, and 3.3), and tests were conducted to characterize the binder. The results indicated that the process was efficient in generating a non-crystalline sodium silicate powdered material. With high SiO2/Al2O3 molar ratio the mortars achieved high compressive strength and it increased with age, had low permeability, and capillary water absorption. Compressive strength results varied from 6 MPa to 12 MPa at 28 days, indicating the possibility of using the proposed method for one-part AAB production. AAB produced can be applied in different building materials.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100226&lng=en&tlng=en

69

scielo_articles/scl/1516-1439/S1516-14392022000100226.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Geraldo, Rodrigo H.", "Gonçalves, Jardel P.", "Camarini, Gladis" ]

null

[ ": One-part alkali-activated binder", "production process", "cement", "alternative binder", "cleaner production", "sustainability" ]

null

[ "Universidade Estadual de Campinas", "Centro Universitário FACENS", "Universidade Federal da Bahia", "Centro Universitário do Sul de Minas" ]

scl/1516-1439/S1516-14392022000100338.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100338

10.1590/1980-5373-mr-2022-0199

ENGINEERING, CHEMICAL

Universidade de Brasília

null

Four-Point Bending Fatigue Behavior of Al2O3-ZrO2 Ceramic Biocomposites Using CeO2 as Dopant

Coutinho, Maycol Moreira

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

This work investigated the effect of adding ceria-stabilized tetragonal zirconia (Ce-TZP) on the fatigue behavior of alumina-based ceramic composites. Alumina powder (control group) and mixtures containing 5 wt.% (group A) and 20 wt.% (group B) of a commercial m-ZrO2/Al2O3/CeO2 powder mixture were milled/homogenized, compacted, sintered at 1600°C-2h, and submitted to hydrothermal degradation. The samples were characterized by relative density, microstructure, crystalline phases, and static mechanical properties. The cyclic fatigue strength was determined using the modified staircase method in 4-point bending tests. The results indicate that adding the m-ZrO2/Al2O3/CeO2 powder mixture to the Al2O3-matrix increases the tetragonal-ZrO2 grains (Ce-TZP) content, presenting 2.9 wt.% of Ce-TZP and 11.9 wt.% of Ce-TZP for group A and group B, respectively. Furthermore, the addition of Ce-TZP improves densification (98.5% → 99.1%) with a slight reduction in hardness and modulus of elasticity and a significant KIC increase of the composite (KIC = 6.7 MPa.m1/2, group B) when compared to monolithic alumina (KIC=2.4 MPa.m1/2). The fatigue strength limit of the control group was around 100 MPa, while the composites (groups A and B) presented the values of 279 MPa and 239 MPa, respectively. The results indicated that the incorporation of Ce-TZP significantly improves the fracture toughness of alumina-based ceramics. On the other hand, regarding the fatigue behavior, there was an increase in fatigue resistance in group A, resulting from the benefits of the t→m Ce-TZP grains transformation, which occurs during cyclic loading, producing a zone shielding that involves the tip of the crack, slowing its growth. The increase in the amount of Ce-TZP (group B) leads to an increase in the internal residual stresses between the phases due to anisotropy and difference in the thermal expansion coefficients, which accelerates the phase transformation and formation of microcracks at grain boundaries, reducing the fatigue strength of composites of group B.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100338&lng=en&tlng=en

48

scielo_articles/scl/1516-1439/S1516-14392022000100338.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Coutinho, Maycol Moreira", "Nascimento, Anne Caroline de Paula", "Amarante, José Eduardo Vasconcelos", "Santos, Claudinei dos", "Ferreira, Jorge Luiz de Almeida", "Silva, Cosme Roberto Moreira da" ]

null

[ "Zirconia-toughened alumina (ZTA)", "Ce-TZP reinforcement", "fracture toughness", "fatigue behavior", "four-point tests", "modified staircase method" ]

null

[ "Universidade de Brasília", "Universidade Federal Fluminense", "Universidade do Estado do Rio de Janeiro" ]

scl/1516-1439/S1516-14392022000100340.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100340

10.1590/1980-5373-mr-2022-0010

ENGINEERING, CHEMICAL

Manipal Academy of Higher Education

null

Investigation on the Wire Electric Discharge Machining Performance of artificially aged Al6061/B4C composites by Response Surface Method

Deepak, D.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Present research work is focused on investigation of material removal rate in Wire-ED Machining (EDM) of artificially aged Al-6061/ B4C reinforced composites with 2-6 wt.% in peak aged condition. Combined effect of B4C and artificial aging at 100°C improved the hardness by 20 - 170% under as cast and artificially aged condition. Initially the wire EDM experiments are conducted on Al6061 alloy and then the process parameters such as current, pulse-on time (ton) and pulse-off time (toff) are optimized to obtain the high material removal rate (MRR). At optimized conditions test samples with various % of B4C are machined to study their influence on MRR. The study revealed that current and toff had a significant influence. MRR increased as current is increased and it decreased as toff is increased. Maximum MRR at optimum settings, current : 5.53 A, Toff: 10 µs and Ton: 36.46 µs is 2.45 mg/min. Considering the limitation of the experimental set up the modified optimum settings (Toff: 10 µs, Ton: 30 µs and current : 5 A) resulted in average MRR of 2.39 mg/min with deviation of 0.20 mg/min. The study showed that there is no significant difference in MRR and the morphology of the machined surface with respect to test samples of different % of B4C particles as reinforcement in Al6061 composite.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100340&lng=en&tlng=en

39

scielo_articles/scl/1516-1439/S1516-14392022000100340.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Deepak, D.", "Gowrishankar, M.C.", "Shreyas, D. Sai" ]

null

[ "Wire-EDM", "Artificial aging", "Al6061/B4C composite", "pulse on time", "pulse off time" ]

null

[ "Manipal Academy of Higher Education", "Manipal Academy of Higher Education" ]

scl/1516-1439/S1516-14392022000100225.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100225

10.1590/1980-5373-mr-2021-0413

ENGINEERING, CHEMICAL

Taif University

null

Enhancement of Barrier and Mechanical Performance of Steel Coated with Epoxy Filled with Micron and Nano Alumina Fillers

Saber, D.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Steel is an essential part of our life as it is used in wide applications as food equipment and heavy construction. The polymeric coating prevents the deterioration of the properties of metals due to rust and corrosion. This study investigated a reinforced polymeric coating to steel for enhancing barrier and mechanical properties. A comparison between different configurations of double-layered polymeric coatings was attained. The results showed that a maximum enhancement of 16.7%, 18.9%, 32.6%, 8.5%, and 5.7% in tensile strength, tensile strain, toughness, flexural strength, and flexural strain, respectively were achieved with a coating of epoxy filled with 1wt% Al2O3 microparticles before 1wt% Al2O3 nanoparticles on both sides as compared with pure epoxy coating. Adding micro/nanoparticles to epoxy coating enhanced the barrier properties of the coated steel against salt solution and citric acid environment as compared to pure epoxy coated steel.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100225&lng=en&tlng=en

50

scielo_articles/scl/1516-1439/S1516-14392022000100225.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Saber, D.", "Alghtani, Abdulaziz H.", "Ahmed, Emad M.", "Felemban, Bassem F.", "Ali, Hafiz T.", "Megahed, M.", "El-Aziz, Kh. Abd" ]

null

[ "Micro/nanocomposites coating", "Alumina", "Steel", "Mechanical properties", "Food equipment", "Barrier properties" ]

null

[ "Taif University", "Taif University", "Taif University", "Zagazig University" ]

scl/1516-1439/S1516-14392022000100224.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100224

10.1590/1980-5373-mr-2021-0375

ENGINEERING, CHEMICAL

Centro Universitário Votuporanga

null

Analysis of the Influence of Contamination in Lubricant by Biodiesel in a Pin-On-Disk Equipment

Cuerva, Murilo Parra

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

The introduction of biodiesel to commercial diesel is being increased every year. The need to check this addition to the engine and lubricant is important for automakers and internal combustion engine manufacturers. The oil analysis technique is a type of predictive maintenance, done by collecting oil from equipment and analyzing it later in the laboratory, or by analyzing it directly and continuously in on-line systems. In internal combustion engines, all parts have a pre-established service life, longer or shorter, according to the specific function assigned to it. By analyzing the oil, the condition of these parts can be monitored. The oils analysis reveals the first signs of wear of a component. The identification is made based on the study of the number of particles, size, shape and composition thereof, present in the lubricant samples, which provide accurate information about the conditions of the moving surfaces without the need to disassemble the assembly to which these parts belongs. In this work a lubricant contamination by biodiesels were made to simulate possible scenarios within an internal combustion engine.The lubricant recommended by an engine manufacturer was “contaminated” with commercial diesel and with different percentages and types of biodiesel. After this “contamination” they were placed in a pin on disk device under certain conditions.Through the analyzes of the lubricants extracted from the Pin on disk Equipment after the tests, some analysis were carried out in order to study the effects of using biodiesel in the internal combustion engine.These analyzes consisted of Flash point, analytical ferrography, monitoring of ferrous particles generated, viscosity, viscosity index, basicity index and X-ray spectrometry.Among the results obtained it is observed that for a 5% contamination of animal biodiesel there was an increase in the viscosity index. Conversely, the contamination of 5% of animal + vegetable biodiesel decreased the viscosity index in relation to Diesel B5. We also found that these biodiesel additions were not detrimental to the engine and lubricant at the mix ratios and test conditions used.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100224&lng=en&tlng=en

20

scielo_articles/scl/1516-1439/S1516-14392022000100224.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Cuerva, Murilo Parra", "Gonçalves, Aparecido Carlos", "Albuquerque, Maria da Consolação Fonseca de", "Chavarette, Fábio Roberto", "Outa, Roberto", "Almeida, Estevão Fusaro de" ]

null

[ "Predictive maintenance", "Biodiesel", "Wear particles", "Lubricant analysis", "Diesel internal combustion engines", "PIN-ON-DISK" ]

null

[ "Centro Universitário Votuporanga", "Universidade do Estado de São Paulo", "Universidade do Estado de São Paulo", "Universidade do Estado de São Paulo", "Faculdade de Tecnologia de Araçatuba" ]

scl/1516-1439/S1516-14392022000100223.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100223

10.1590/1980-5373-mr-2021-0293

ENGINEERING, CHEMICAL

Northwestern Polytechnical University

null

The Effect of Heat Treatment on the Evolution of Microstructure and Texture in Ti80 Hot Rolled Pipe

He, Shengtong

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract In this study, the microstructure and texture evolution of hot rolled Ti80 pipe annealing at 960°C and 990°C in α+β two-phase field have been investigated. The results showed that the dissolution of α phases induced the increase of texture components of primary α phases (αP) and the αP were the main factors that determine the final texture at 960°C. At 960°C, the microtextures of secondary α phases (αS) were very close to that of αP. As the annealing temperature increased to 990 °C, the main factors affecting the microtextures of αS changed from the αP to the recrystallized β grains. The textures of β phases were greatly influenced by the annealing temperature. The β phases at high temperature were not mainly from the grow up of residual β phases. It was formed by the transformation of α phases at room temperature. Consequently, this study could provide some ideas for decreasing the texture intensities of hot rolled Ti80 pipes, such as reducing the area of α colonies before rolling, scattering the crystal orientations of αP, and controlling the size of recrystallized β grains.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100223&lng=en&tlng=en

28

scielo_articles/scl/1516-1439/S1516-14392022000100223.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "He, Shengtong", "Zeng, Weidong", "Xu, Jianwei", "Zhou, Dadi" ]

null

[ "Titanium alloys", "Texture", "Heat treatment", "Electron backscattered diffraction (EBSD)" ]

null

[ "Northwestern Polytechnical University", "Northwestern Polytechnical University", "Northwestern Polytechnical University", "State Key Laboratory of Solidification Processing" ]

scl/1516-1439/S1516-14392022000100222.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100222

10.1590/1980-5373-mr-2021-0241

ENGINEERING, CHEMICAL

Universidade do Estado do Rio de Janeiro

null

Polycrystalline Compound of Co2+-doped Zn2SnO4: Structural and Photoluminescent Properties

Alvarenga, T. L.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract In this work, Zn2SnO4:Co2+ (0.1%) was obtained through a solid-state reaction at high temperature using ZnO, SnO2, and CoCO3. The sample was investigated using X-ray diffraction, X-ray fluorescence, scanning electron microscopy, and photoluminescence spectroscopy. Rietveld refinements of the X-ray diffraction data showed two crystalline phases, Zn2SnO4 and SnO2, with proportions of 97.24% and 2.76%, respectively, while Zn and Sn atoms were observed by X-ray fluorescence. Scanning electron microscopy images showed the polycrystalline nature of the material. Photoluminescence spectroscopy showed two emission bands in the red and near-infrared regions, with the broader and more intense band having a barycenter at 694 nm. The intensity of the emission changed with the excitation wavelength, whereas the barycenter remained unchanged. The intensity, shape, and position of the bands, as well as the calculated crystal field parameters, indicate the insertion of Co2+ ions in the tetrahedral sites of the Zn2SnO4 material.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100222&lng=en&tlng=en

33

scielo_articles/scl/1516-1439/S1516-14392022000100222.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Alvarenga, T. L.", "Pedro, S. S.", "López, A.", "Sosman, L. P." ]

null

[ "Photoluminescence", "emission", "Co2+", "Zn2SnO4" ]

null

[ "Universidade do Estado do Rio de Janeiro" ]

scl/1516-1439/S1516-14392022000100221.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100221

10.1590/1980-5373-mr-2021-0164

ENGINEERING, CHEMICAL

Andalas University

null

Magnetic Particles Nanorod of ZnO/CuFe2O4 Prepared by Green Synthesized Approach: Structural, Optical and Magnetic Properties, and Photocatalytic Activity

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract In this study, magnetically separable ZnO/CuFe2O4 nanorod particles were synthesized by the green synthesis approach, using rambutan peel extract (Nephelium lappaceum L.) as a capping agent. The samples were evaluated as photocatalyst for the degradation of Rhodamine B dye driven by solar light irradiation. The XRD patterns represented the specific peaks of ZnO and CuFe2O4 in the ZnO/CuFe2O4 composite. SEM and TEM images showed the rod-like shape of the ZnO/CuFe2O4 composite synthesized using 3 mL (ZCuE3N) of rambutan peel extract. ZCuE3N sample has an increase in photocatalytic activity up to 98.8% in the degradation of Rhodamine B under solar light irradiation for 2 h. Magnetic measurement by VSM revealed that ZnO/CuFe2O4 composite was superparamagnetic. ZnO/CuFe2O4 composites remained stable in an air atmosphere and exhibited promise as a reusable photocatalyst as it can be easily separated from the solution by an external magnetic field.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100221&lng=en&tlng=en

42

scielo_articles/scl/1516-1439/S1516-14392022000100221.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "", "Azizah, Nurul", "Stiadi, Yeni", "Putri, Yulia Eka", "" ]

null

[ "ZnO/CuFe2O4 nanorod", "green synthesis", "Nephelium lappaceum L", "Rhodamine B" ]

null

[ "Andalas University" ]

scl/1516-1439/S1516-14392022000100220.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100220

10.1590/1980-5373-mr-2021-0401

ENGINEERING, CHEMICAL

Anhui University of Technology

null

Characterization of Dislocation Structure in a Nb-bearing Austenitic Stainless Steel After Low Cycle Fatigue via TEM and EBSD

Fang, Liangwei

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract In this paper, the relationship between Kernel average misorientation (KAM), geometrically necessary dislocation (GND) density and dislocation structures of Nb-bearing austenitic stainless steel under low cycle fatigue (LCF) was studied at 600°C at the total strain amplitude ranged from 0.3% to 1.0%. The results based on EBSD analysis show that the GND density in fatigue specimens gradually increases with the increase of strain amplitude. Under LCF loading, the dislocation structures are mainly planar slip bands (PSBs) and the cell structures. With the increase of strain amplitude, the number of PSBs increases with decrease in width, and the average diameter of cells also decreases. The PSBs originate due to the dynamic strain aging (DSA) effect, and DSA is more significant under high strain amplitude. The average diameter of cell structures has a specific relationship with GND density.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100220&lng=en&tlng=en

37

scielo_articles/scl/1516-1439/S1516-14392022000100220.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Fang, Liangwei", "Zhao, Wei", "Wei, Yong", "Zhang, Qi", "Zhang, Liqiang", "Ali, Naqash", "Zhou, Hongwei", "Wei, Hailian" ]

null

[ "austenitic heart-resistant steel", "low-cycle fatigue", "EBSD", "geometrically necessary dislocation", "dislocation structure" ]

null

[ "Anhui University of Technology", "Anhui University of Technology", "Yanshan University" ]

scl/1516-1439/S1516-14392022000100270.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100270

10.1590/1980-5373-mr-2021-0350

ENGINEERING, CHEMICAL

Universidade Estadual de Londrina

null

Covalent Immobilization of Lipase on Bacterial Cellulose Membrane and Nanocellulose

Brisola, Juliano

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract The cellulose from Komagataeibacter hansenii is synthesized as a thin film at the surface of glucose based media. Strong acid hydrolysis release sections of crystalline cellulose chains in nanometric scale that leads to persistent suspensions in water. The cellulose anhydro-glucose hydroxyls are suitable to receive functional groups as enzymes, and lipases have great economic value being a valuable model for protein immobilization. In this work both, the membrane of bacterial cellulose as well the nanocellulose produced trough acid hydrolysis, was functionalized with a lipase. The bacterial cellulose membranes were produced by Hestrin-Schramm medium, and nanocelluloses produced from the pristine material was characterized using techniques as 13C solid state NMR and transmission electron microscopy (TEM). The pristine membranes and nanocellulose were functionalized with succinic acid as linker, then lipase was conjugated using EDC (N-(3-Dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride), and NHS (N-Hydroxysuccinimide). The effectiveness of the chemical process was characterized, and the lipase activity were measured. The presence of the succinic acid and amide linkage, as well physical-chemical changes on the functionalized polysaccharide. Hence, we inferred that after immobilization the enzyme maintained its activity in both cellulose and the cellulose membrane.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100270&lng=en&tlng=en

47

scielo_articles/scl/1516-1439/S1516-14392022000100270.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Brisola, Juliano", "Andrade, Gabriel Jonathan Sousa", "Oliveira, Sabrina Alves de", "Viana, Renato Marcio Ribeiro", "Tischer, Paula Cristina de Sousa Faria", "Tischer, Cesar Augusto" ]

null

[ "Biodegradable polymers", "Industrial applications", "Nanomaterials" ]

null

[ "Universidade Estadual de Londrina", "Universidade Tecnológica Federal do Paraná" ]

scl/1516-1439/S1516-14392022000100272.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100272

10.1590/1980-5373-mr-2021-0441

ENGINEERING, CHEMICAL

Universidade Federal de São Carlos

null

A Review of Three-Dimensional Tin Halide Perovskites as Solar Cell Materials

Dawson, M.

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Thin film solar cell materials such as 3D metal halide perovskites are cheaper alternatives to silicon. Presently, the conversion efficiency of 3D lead halide perovskites is 25.5% (2021), which represents an increase of more than 550% since their discovery in 2009 (3.8%). Despite this remarkable progress, concerns about the toxicity of lead have sparked the quest for possible substitutes, in particular, 3D tin halide perovskites. This review covers the general properties of tin halide perovskites, synthesis and stability. It also identifies possible gaps and application beyond solar cells.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100272&lng=en&tlng=en

202

scielo_articles/scl/1516-1439/S1516-14392022000100272.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Dawson, M.", "Ribeiro, C.", "Morelli, M. R." ]

null

[ "Organic-inorganic perovskite", "tin halide perovskite", "lead-free perovskite", "solar cell material and ceramics" ]

null

[ "Universidade Federal de São Carlos", "Embrapa Instrumentação" ]

scl/1516-1439/S1516-14392022000100342.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100342

10.1590/1980-5373-mr-2022-0115

ENGINEERING, CHEMICAL

Nanjing University of Science and Technology

null

Inhomogeneous Deformation and Texture Evolution of 30SiMn2MoVA Steel Gun Barrel Processed by Radial Forging Based on Cross-scale Crystal Plasticity Finite Element Method

Yang, Yuzhao

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract There is anisotropy in 30SiMn2MoVA steel gun barrel processed by radial forging which results in the low service life of the gun barrel. While the texture is the main reason for the anisotropy. The crystal plasticity finite element (CPFE) method is usually used to simulate the microstructure and the texture of the metal. In the present work, a two-dimensional polycrystalline finite element model based on electron back-scattered diffraction (EBSD) experiment data is developed to represent virtual grain structures of polycrystalline 30SiMn2MoVA steel. The displacement of nodes in the macro radial forging process finite element model is used as the cross-scale boundary condition in the CPFE model which realizes cross-scale simulation. The texture evolution and inhomogeneous deformation of 30SiMn2MoVA steel in the radial forging processing under three different forging ratios were simulated. The simulated texture results are consistent with the experimental results. The inhomogeneous deformation of grains is obvious and will intensify with the increase of the forging ratio. The distributions of stress and equivalent plastic strain in polycrystals are statistically Gaussian. With the increase of deformation, the further refinement of grains is due to the large shear strain in large grains.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100342&lng=en&tlng=en

35

scielo_articles/scl/1516-1439/S1516-14392022000100342.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Yang, Yuzhao", "Xu, Cheng", "Fan, Lixia" ]

null

[ "30SiMn2MoVA steel", "radial forging", "cross-scale crystal plasticity finite element", "inhomogeneous plastic deformation", "texture" ]

null

[ "Nanjing University of Science and Technology" ]

scl/1516-1439/S1516-14392022000100317.xml

en

research-article

Materials Research

1980-5373

SciELO Brazil

ABM, ABC, ABPol

S1516-14392022000100317

10.1590/1980-5373-mr-2021-0472

ENGINEERING, CHEMICAL

Universidade Federal de Campina Grande

null

Evaluation of Crosslinking Conditions on the Properties of Chitosan Woven Meshes

Silva, Henrique Nunes Da

2,022

null

This work is licensed under a Creative Commons Attribution 4.0 International License.

null

Abstract Crosslinking of chitosan (CS) woven meshes is reported in this study. CS filaments were obtained by wet spinning and hand-waved. The weft was coated with CS solutions (3 and 4% w/v) and crosslinked with sodium tripolyphosphate or genipin. CS filaments were free from superficial pores, and their mechanical properties were suitable for the weaving process. CS concentration in the coating, type, and the crosslinking time affected the mesh morphology obtained. Crosslinking by both agents was confirmed by spectroscopy, corroborating the reduction of the hydrophilicity of the crosslinked samples in the swelling and contact angle tests. Crosslinking conditions were effective in reducing the mechanical properties variation in the wet state, as well as regulating the degradation rate of the samples. Furthermore, it was observed that crosslinking did not significantly affect the cell viability of CS woven meshes, making them promising materials for application as stress material in a physiological environment.

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100317&lng=en&tlng=en

80

scielo_articles/scl/1516-1439/S1516-14392022000100317.xml

scielo.br

scl

[ "ENGINEERING, CHEMICAL", "MATERIALS SCIENCE, MULTIDISCIPLINARY", "METALLURGY & METALLURGICAL ENGINEERING" ]

[ "Silva, Henrique Nunes Da", "Tissiani, Marcelo Paulo", "Souza, Matheus Ferreira de", "Barreto, Maria Eduarda Vasconcelos", "Barbosa, Rossemberg Cardoso", "Fook, Marcus Vinícius Lia" ]

null

[ "Chitosan", "filaments", "weaving", "woven mesh", "crosslinking" ]

null

[ "Universidade Federal de Campina Grande" ]