Article
Nanoscience & Nanotechnology
A. Rezaei, R. Mahmudi, R. E. Loge
Summary: This study investigated the effects of multiple passes of simple shear extrusion (SSE) on the microstructure and hardness of a Mg-6Gd-3Y-1.5Ag alloy. It was found that increasing the number of SSE passes led to an increase in the fraction of fine grains and a gradual improvement in hardness. Furthermore, the microstructure became more homogeneous with an increase in SSE passes.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Mageshwari Komarasamy, Xiao Li, Scott A. Whalen, Xiaolong Ma, Nathan Canfield, Matthew J. Olszta, Tamas Varga, Alan L. Schemer-Kohrn, Anqi Yu, Nicole R. Overman, Suveen N. Mathaudhu, Glenn J. Grant
Summary: The microstructural development of an immiscible Cu-Nb alloy processed via friction consolidation of elemental powders was investigated, revealing the effect of different processing pathways on the final microstructure. Findings suggest a pathway for creation of novel tailored microstructures and improved properties in binary immiscible alloy systems.
JOURNAL OF MATERIALS SCIENCE
(2021)
Review
Materials Science, Multidisciplinary
Ramin Ebrahimi, Faraz Rahimzadeh Lotfabad
Summary: Simple shear extrusion is a severe plastic deformation technique designed in 2009 to obtain ultrafine-grained materials. Extensive research has been conducted to introduce and explore the characteristics of this technique, as well as investigate its potential for industrialization.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
M. Sabbaghian, R. Mahmudi, K. S. Shin
Summary: The influence of equal channel angular pressing (ECAP) and simple shear extrusion (SSE) on the microstructure, texture development, and mechanical properties of Mg-4Zn alloy was investigated. It was found that SSE resulted in smaller grain sizes and a different texture development compared to ECAP. Both ECAP and SSE improved the strength of the alloy, but SSE showed better results.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Nadja Berndt, Philipp Frint, Marcus Boehme, Soren Mueller, Martin F. -X. Wagner
Summary: Cold extrusion of AA1080 aluminum alloy results in a pronounced multi-gradient deformation structure with distinct differences in terms of texture, grain size, and strain hardening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
A. Rezaei, R. Mahmudi, C. Cayron, R. Loge
Summary: By adding silver, the grain size of magnesium alloys can be significantly reduced and further refined during the SSE process. The presence of silver plays a crucial role in suppressing the solute drag effect of segregated Gd and Y elements at the grain boundaries, leading to enhanced dynamic recrystallization behavior in the processed alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Maria Richert, Rafal Hubicki, Piotr Lebkowski
Summary: This study investigates the structure refinement of aluminum and its alloys through reciprocating extrusion. It reveals that the primary mechanism for hardening is the propagation of shear bands, and that structure renewal processes transform the formed micro and nano volumes into grains with large misorientation angles. The research also shows that higher metal purity leads to stronger structure renewal processes.
Article
Materials Science, Multidisciplinary
N. M. Krywopusk, L. J. Kecskes, T. P. Weihs
Summary: Processing of 99.9% pure, as-cast magnesium by Equal Channel Angular Extrusion significantly reduces grain size to around 30 μm after the second pass, but grain size varies after the third and fourth passes depending on extrusion rate. Slower rates lead to an increase in grain size after the third and fourth passes, while the fastest rate maintains relatively consistent grain size. The presence of twins in microstructures also varies with extrusion rate.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
M. Shahbaz, N. Pardis, J. Moon, R. Ebrahimi, H. S. Kim
Summary: Vortex extrusion uses a novel designed stationary die to impose intense strain to materials, resulting in torsional deformation and reduction in area. By utilizing a streamline approach to design the VE die, processed samples exhibit a higher fraction of high-angle grain boundaries and significantly improved tensile properties compared to conventional extrusion methods.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Radoslaw Lyszkowski
Summary: This study evaluates the impact of changing the deformation routes of the extrusion process on the structure and properties of a CuZn36 alloy. The improvement of strength properties was obtained as a result of grain fragmentation in the process. The obtained results showed that the mechanical properties of the alloy depend on the number of passes and the material deformation route. The material pressed four times with the rotation of 90 degrees exhibited the highest strength.
Article
Chemistry, Physical
Adrien Heinzelmeier, Antoine Guitton, Marc Novelli, Wenbo Yu, Thierry Grosdidier
Summary: Ti2AlC and Ti3AlC2 are part of the MAX phases, a family of layered compounds. The study tests a composite approach to improve the brittleness of these compounds. Surface severe plastic deformation (SSPD) was conducted on a bulk MAX compound and a MAX/TiAl2 composite using surface mechanical attrition treatment (SMAT). The presence of intergranular TiAl2 effectively prevented failure in the composite, resulting in a surface hardening gradient extending down to a depth of 250 μm.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Biochemistry & Molecular Biology
Alexandra E. Lagogianni, Fathollah Varnik
Summary: One of the key issues in the application of metallic glasses as structural components is the localization of deformation in shear bands. This study focuses on the process of local temperature rise due to viscous heat generation and discusses its consequences in the context of current research in the field.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Metallurgy & Metallurgical Engineering
A. Rezaei, R. Mahmudi, C. Cayron, R. E. Loge
Summary: This study employed two severe plastic deformation (SPD) techniques, simple shear extrusion (SSE) and equal channel angular pressing (ECAP), to process a magnesium alloy. It was found that the different shear strain paths of the two techniques caused different progression rates of dynamic recrystallization (DRX), resulting in higher recrystallization fractions and high angle grain boundaries (HAGBs) in the ECAP-processed alloy.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Metallurgy & Metallurgical Engineering
Zhengran Liu, Xi Zhao, Kai Chen, Siqi Wang, Xianwei Ren, Zhimin Zhang, Yong Xue
Summary: Isothermal repetitive upsetting extrusion (RUE) was used to process ZK60 magnesium alloy at 380 degrees C, resulting in refined grain size and improved elongation and superplasticity of the alloy. Texture evolution played a role in reducing the anisotropy of the alloy by changing the initiation ability of slip in different directions.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Chemistry, Physical
Viet Q. Vu, Laszlo S. Toth, Yan Beygelzimer, Yajun Zhao
Summary: The FALEP process effectively transforms aluminum Al-1050 from bulk material to metal sheets in one deformation step at room temperature. It significantly refines the microstructure, enhances texture, and improves strength characteristics, making it a promising candidate for industrial applications.
Article
Chemistry, Physical
F. Khodabakhshi, O. Ekrt, M. Abdi, A. P. Gerlich, M. Mottaghi, R. Ebrahimi, M. Nosko, G. Wilde
Summary: An advanced SPD method called accumulative fold-forging was used to produce layered nanostructured MgNi alloys with superior hydrogen storage capacity. Adjusting the structure can control hydrogen uptake and release characteristics, while refining the grain structure to the nano-scale range can further enhance hydrogen absorption capacity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
M. Abdi, R. Ebrahimi
Summary: In this study, multi-step processing of an as-cast AZ91 alloy using twin parallel channel angular extrusion was investigated. The results showed that processing for three passes at temperatures of 340, 300, and 250 degrees C resulted in the most uniform and fine microstructure with reduced grain size and dislocation density. The average hardness value also significantly improved compared to the initial value.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Engineering, Mechanical
Ramin Ebrahimi, Faraz Rahimzadeh Lotfabad
Summary: This study presents a comprehensive mathematical analysis of the bulge test, focusing on addressing potential misinterpretations of the test results by users. The consistency between experimental data and mathematical models confirms the accuracy of this method.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF MECHANICAL ENGINEERING
(2022)
Article
Polymer Science
Maryam Ghobadi, Faraz Rahimzadeh Lotfabad, Seyed Mojtaba Zebarjad, Ramin Ebrahimi
Summary: The main focus of this investigation is to quantitatively analyze the opposing effect of filler on the desired properties of fabricated composite specimens. Through experiments, HDPE-BN composites with different proportions of BN were prepared, and their density and thermal conductivity were measured. The multi-objective optimization method was used to determine the optimal BN content, and the relative importance of these properties was evaluated using the entropy method. The study found that density has a more determinative role in the efficiency of a particular filler in circumstances where both thermal conductivity and density have practical importance.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Chemistry, Physical
Keyvan Mirzaee Fashalameh, Zahra Sadeghian, Ramin Ebrahimi
Summary: In this study, a planar multi-layer solid oxide fuel cell (SOFC) was successfully fabricated using slurry-based 3D printing. The results showed that the use of hierarchically macromesopores structure can increase power density, and electrochemical performance can be improved by modifying the geometry of the layers.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Materials Science, Multidisciplinary
Ramin Ebrahimi, Faraz Rahimzadeh Lotfabad
Summary: Simple shear extrusion is a severe plastic deformation technique designed in 2009 to obtain ultrafine-grained materials. Extensive research has been conducted to introduce and explore the characteristics of this technique, as well as investigate its potential for industrialization.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Crystallography
Mohammad Abdi, Ramin Ebrahimi, Ebad Bagherpour
Summary: In this study, the developed SPD processing technique of Twin Parallel Channel Angular Extrusion (TPCAE) was utilized to enhance the hydrogen storage properties of AZ91 cast alloy. By conducting hydrogen absorption and desorption tests kinetically at different temperatures, it was found that TPCAE processing significantly improved the absorption kinetic and desorption rate of the alloy.
Article
Mathematics
Ramin Ebrahimi
Summary: This article investigates the invertibility condition of the natural map qiX,A: ExtiA(X, A) to ExtiA/C(q(X), q(A)) for every object X and A, and every i in {0, 1, ..., k} in a essentially small abelian category A with a given Serre subcategory C. An application of the main theorem is also provided.
JOURNAL OF ALGEBRA
(2023)
Article
Materials Science, Multidisciplinary
Mohammad Hassan Farshidi, Muhammad Rifai, Hiroyuki Miyamoto
Summary: This study aims to investigate the grain refinement, texture evolutions, and strengthening of a recycled Al-1.7Fe-0.9Si-0.5Cu alloy using the tube channel pressing severe plastic deformation process. Electron backscattered diffraction equipped scanning electron microscope was used to analyze the grain refinement and texture evolutions, while tension test was conducted to measure the strength. The results show that the first pass of the process leads to significant grain refinement and strength increase, but additional passes only result in minor grain refinement and slight strength decrease. Moreover, important texture components related to shear deformation have been observed due to the process imposition.
KOVOVE MATERIALY-METALLIC MATERIALS
(2023)
Article
Engineering, Mechanical
Zahra Ramezani Anbaran, Faraz Rahimzadeh Lotfabad, Ramin Ebrahimi, Habib Danesh Manesh
Summary: In this investigation, a previously proposed phenomenological model is generalized in terms of its mathematical form and the yield function used. The Al 1050 material is chosen as the model material, and its tensile properties and forming limit curve (FLC) are obtained through annealing and tests. The constants of the generalized model are obtained by curve fitting, and the model's accuracy is improved at the cost of losing a single mathematical expression for both branches of the FLC. The study also shows that using the Hosford yield criterion yields better predictions compared to using the von Mises yield criterion.
JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Javid Naseri, Khalil Ranjbar, M. Reihanian
Summary: Copper-based Cu-1Cr-0.2Zr alloys reinforced with graphene nanosheets were fabricated via powder metallurgy. The addition of graphene nanosheets resulted in increased compressive yield stress, with the maximum yield stress achieved with 1 wt% graphene. The electrical conductivity enhanced with rising sintering temperature, while it decreased with graphene addition. Optimal electrical and mechanical properties were achieved at a sintering temperature of 750°C and 0.1 wt% graphene addition.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
N. Jahani, M. Reihanian, Kh. Gheisari
Summary: FeNiMnCuX (X: Co, Cr, Mo, Ti, W) high entropy alloys were successfully fabricated by mechanical alloying. After 15 h of milling, FeNiMnCu and FeNiMnCuCo alloys formed a single FCC structure, while other alloys formed an FCC + BCC mixture structure. Fe and Ni were homogeneously distributed in all alloys, while Cu was segregated. Mn exhibited homogeneous distributions in FeNiMnCuTi and FeNiMnCuW alloys, whereas in others it formed Mn-rich islands. Except for FeNiMnCuTi alloy, all alloys showed soft magnetic behavior. The saturation magnetization of FeNiMnCu alloy increased by adding Co and decreased by adding Cr, Mo, Ti, and W.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
M. Reihanian, Khalil Ranjbar, Z. Hajizadeh
Summary: This study investigates the effect of Er and Zr addition on the microstructure, mechanical properties, and wear behavior of the cast A356 alloy. Aging of A356-0.25Zr and A356-0.25Er alloys resulted in partial eutectic and columnar structures. A356, A356-0.5Er, and A356-0.5Er-0.25Zr alloys exhibited large alpha-Al grains with discrete eutectic silicon. Different intermetallic types and morphologies were observed after peak aging. The A356-0.25Zr alloy achieved the highest hardness (around 120 HV) and tensile strength (around 215 MPa) under peak-aged conditions. The A356 alloy had the lowest weight loss and friction coefficient, despite having the lowest hardness. Delamination was the dominant wear mechanism in all alloys.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
M. Javdan, Kh. Gheisari, M. Reihanian
Summary: The influence of Si addition on the microstructure and magnetic properties of (FeCoNi)75Cu25-xSix (x = 0, 5, 10, 15, 20, 25 at. %) alloys synthesized by mechanical alloying was studied. Various characterization techniques were used to evaluate the phases and distribution of elements in the alloys. The alloys exhibited semi-soft magnet behavior, with the coercivity increasing significantly with an increase in Si content, while the saturation magnetization slightly fluctuated and then sharply declined with increasing Si content from 20 at. % to 25 at. %.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Majid Naseri, Mohsen Reihanian, Ahmad Ostovari Moghaddam, Davood Gholami, Seyedmehdi Hosseini, Mohammad Alvand, Ehsan Borhani, Evgeny Trofimov
Summary: In this study, a strategy was proposed to achieve microstructural refinement and outstanding strength-ductility synergy in Al/Brass composites through cross accumulative roll bonding (CARB). The CARB processed composite exhibited higher tensile strength and elongation compared to the ARB processed specimen, along with unique crystallographic texture features.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)