Article
Chemistry, Physical
Payam Edalati, Abbas Mohammadi, Mostafa Ketabchi, Kaveh Edalati
Summary: Dual-phase HEAs have attracted significant attention due to their promising mechanical properties, and experimental investigation on the AlFeCoNiCu alloy reveals diverse microstructural evolution behaviors of the two phases during plastic deformation, leading to a high microhardness of 495 Hv under high-pressure torsion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Payam Edalati, Abbas Mohammadi, Mostafa Ketabchi, Kaveh Edalati
Summary: This study combines multiple strategies to achieve ultrahigh hardness in metallic alloys, including solution hardening, grain refinement, and introducing dual phases. The resulting high hardness is attributed to the formation of nanograins and the generation of dislocations, interfaces, and spinodal-like elemental decomposition.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Martin Fibela-Esparza, Armando Salinas-Rodriguez, Juan Mendez-Nonell, Jose Martin Herrera-Ramirez, Yoshikazu Todaka, Jose Gerardo Cabanas-Moreno
Summary: A Mg-based composite material was produced by high-pressure torsion (HPT) consolidation. Differences were observed in density and microhardness measurements between the center and the periphery. Surface contamination of the Mg powders did not prevent full consolidation of the material.
Article
Materials Science, Multidisciplinary
Abbas Mohammadi, Payam Edalati, Makoto Arita, Jae Wung Bae, Hyoung Seop Kim, Kaveh Edalati
Summary: In this study, three strategies are combined to achieve excellent strength-plasticity combinations in the presence of hydrogen embrittlement phenomena. First, an FCC high-entropy alloy with slow hydrogen lattice diffusion is selected. Second, aluminum is added to hinder surface-to-bulk hydrogen diffusion. Third, low-mobility lattice defects like nanotwins and Lomer-Cottrell locks are introduced by severe plastic deformation to suppress hydrogen-enhanced localized plasticity and stress concentration. The Al0.1CrFeCoNi alloy severely deformed by high-pressure torsion exhibits an ultrahigh yield strength of 1.96 GPa and a high elongation to failure of 10%.
Article
Nanoscience & Nanotechnology
Jeimmy Gonzalez-Masis, Jorge M. Cubero-Sesin, Alexander Campos-Quiros, Kaveh Edalati
Summary: In this study, biocompatible nanostructured high-entropy alloys were successfully synthesized using the high-pressure torsion method. The research compared the characteristics of different alloys and found that as the number of principal elements increased, hardness increased and grain size decreased, but these variations became less significant with further increase in configurational entropy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Takahiro Kunimine, Yohei Tomaru, Minami Watanabe, Ryoichi Monzen
Summary: The tensile deformation behavior of high-strength nanostructured Cu-Si solid-solution alloys processed by high-pressure torsion was studied at room and low temperatures. Increasing Si concentration led to significantly increased tensile strength. This strengthening effect was achieved through grain refinement and increased dislocation density caused by severe plastic deformation with the influence of Si addition on the decreasing stacking fault energy of the Cu-Si alloy.
MATERIALS TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
Krzysztof Bryla, Jelena Horky
Summary: Ultra-fine grained and nanostructured magnesium alloys produced by severe plastic deformation methods are promising for orthopaedic implants due to their enhanced mechanical properties, corrosion resistance, and biocompatibility. This paper provides an overview of the impact of two important methods, equal-channel angular pressing (ECAP) and high-pressure torsion (HPT), on microstructure refinement and mechanical property improvement of magnesium alloys for medical implants. The results demonstrate the beneficial effect of severe plastic deformation methods in obtaining ultra-fine and nanostructured magnesium alloys with improved mechanical and functional properties required for bioabsorbable implants.
MATERIALS TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Benjamin Schuh, Inas Issa, Timo Mueller, Thomas Kremmer, Christoph Gammer, Reinhard Pippan, Anton Hohenwarter
Summary: A nanocrystalline CrMnFeCoNi high-entropy alloy underwent phase decomposition and formed a multi-phase structure after annealing at selected temperatures and times (450 degrees C for 1 h and 15 h and at 600 degrees C for 1 h) following severe plastic deformation by high-pressure torsion. The possibility of tailoring a favorable composite architecture by redistributing, fragmenting, or partially dissolving the additional intermetallic phases was investigated by subjecting the samples to high-pressure torsion again. While the second phase in the 450 degrees C annealing states exhibited high stability against mechanical mixing, partial dissolution could be achieved in the samples subjected to 600 degrees C for 1 h.
Article
Nanoscience & Nanotechnology
S. Kiranbabu, Y. Qin, L. Sreekala, R. Pippan, L. Morsdorf, M. Herbig
Summary: The X30CrMoN15-1 high-nitrogen bearing steel exhibits superior resistance against rolling contact fatigue failures compared to the conventional 100Cr6 bearing steel. Through multi-scale characterization techniques, it is found that the stability of carbonitride precipitates largely contributes to the better performance of the steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Alexey E. Svirid, Vladimir G. Pushin, Natalia N. Kuranova, Vladimir V. Makarov, Yuri M. Ustyugov
Summary: By using electron microscopy and X-ray analysis techniques, combined with measurements of electrical resistance and magnetic susceptibility, the authors have obtained data on the unique characteristics of pre-martensitic states and martensitic transformations, as well as subsequent decomposition in Cu-14wt%Al-3wt%Ni and Cu-13.5wt%Al-3.5wt%Ni shape memory effect alloys. The microstructure, phase composition, mechanical properties, and microhardness of nanocrystalline alloys produced by severe plastic deformation and subsequent annealing have been determined for the first time. A crystallographic model of martensite nucleation and rearrangements beta(1)->beta(1)' and beta(1)->gamma(1)' has been proposed based on analysis of observed tweed contrast and diffuse scattering in the austenite, as well as internal defects in the martensite substructure.
Review
Materials Science, Multidisciplinary
Parisa Edalati, Masayoshi Fuji, Kaveh Edalati
Summary: This article reviews the recent advances in the application of severe plastic deformation to developing superfunctional high-entropy materials, highlighting their superior properties for various mechanical and functional applications.
Review
Materials Science, Multidisciplinary
Kaveh Edalati, Andrea Bachmaier, Victor A. Beloshenko, Yan Beygelzimer, Vladimir D. Blank, Walter J. Botta, Krzysztof Bryla, Jakub Cizek, Sergiy Divinski, Nariman A. Enikeev, Yuri Estrin, Ghader Faraji, Roberto B. Figueiredo, Masayoshi Fuji, Tadahiko Furuta, Thierry Grosdidier, Jeno Gubicza, Anton Hohenwarter, Zenji Horita, Jacques Huot, Yoshifumi Ikoma, Milos Janecek, Megumi Kawasaki, Petr Kral, Shigeru Kuramoto, Terence G. Langdon, Daniel R. Leiva, Valery Levitas, Andrey Mazilkin, Masaki Mito, Hiroyuki Miyamoto, Terukazu Nishizaki, Reinhard Pippan, Vladimir V. Popov, Elena N. Popova, Gencaga Purcek, Oliver Renk, Adam Revesz, Xavier Sauvage, Vaclav Sklenicka, Werner Skrotzki, Boris B. Straumal, Satyam Suwas, Laszlo S. Toth, Nobuhiro Tsuji, Ruslan Z. Valiev, Gerhard Wilde, Michael J. Zehetbauer, Xinkun Zhu
Summary: This article comprehensively reviews recent advances in the development of ultrafine-grained and nanostructured materials through severe plastic deformation and provides a brief history of this field. Severe plastic deformation methods have been effective in producing materials with advanced mechanical and functional properties, and the field of NanoSPD has experienced significant progress in the past two decades.
MATERIALS RESEARCH LETTERS
(2022)
Review
Materials Science, Multidisciplinary
Parisa Edalati, Masayoshi Fuji, Kaveh Edalati
Summary: High-entropy alloys and ceramics with multiple principal elements have gained attention recently for their mechanical and functional applications. Severe plastic deformation (SPD), combined with calculation of phase diagram (CALPHAD) and first-principles calculations, has led to the development of superfunctional high-entropy materials with superior properties compared to conventional engineering materials. This article reviews the recent advances in using SPD to create these materials.
Article
Crystallography
Shivam Dangwal, Kaveh Edalati, Ruslan Z. Z. Valiev, Terence G. G. Langdon
Summary: Strengthening and softening mechanisms in ultrafine-grained materials have been debated for many years. This study examines the Hall-Petch relationship in ultrafine-grained magnesium, aluminum, copper, and iron. The results show that while the materials follow the Hall-Petch relationship initially, an up-break occurs for grain sizes below 500-1000 nm. This is due to enhanced dislocation contribution. However, a down-break occurs for grain sizes smaller than 70-150 nm due to diminished dislocation contribution and increased thermally-activated phenomena. The study also finds that strategies other than grain refinement, such as microstructural stabilization by segregation or precipitation, are necessary to achieve extra strengthening.
Article
Chemistry, Physical
Andrea Mizelli-Ojdanic, Jelena Horky, Bernhard Mingler, Mattia Fanetti, Sandra Gardonio, Matjaz Valant, Bartosz Sulkowski, Erhard Schafler, Dmytro Orlov, Michael J. Zehetbauer
Summary: This study analyzed several biodegradable Mg alloys through high-pressure torsion and elevated temperature heat treatments, revealing significant strength increases from various factors including dynamic recovery for improved ductility. The study also showed that the initial values of Young's modulus and corrosion resistance were largely unaffected by the processing routes, indicating a viable method for optimizing Mg alloys for enhanced mechanical properties while maintaining corrosion properties.
Article
Materials Science, Multidisciplinary
Juhee Oh, Sujung Son, Hyoung Seop Kim, Jae Bok Seol, Hyokyung Sung, Jung Gi Kim
Summary: The combination of severe plastic deformation, deformational heat, and frictional heat generated during the high-pressure torsion process has a significant impact on microstructural evolutions, resulting in unique microstructures and mechanical properties of nanocrystalline metallic materials. In this study, the mechanical properties and microstructural evolution of high-pressure torsion processed aluminum 7068 alloy at room temperature were investigated. The results showed that the mechanical properties of high-pressure torsion represent a strength-ductility trade-off, with an increase in the number of revolutions leading to superior mechanical properties compared to other severe plastic deformation-processed aluminum alloys.
KOREAN JOURNAL OF METALS AND MATERIALS
(2023)
Article
Engineering, Manufacturing
Yongju Kim, Gang Hee Gu, Olivier Bouaziz, Yuri Estrin, Hyoung Seop Kim
Summary: Physics-based constitutive models are preferred over phenomenological models, but they can be too complex for practical finite element simulations. This article introduces a simple constitutive model developed by Bouaziz, which extends the classical physics-based Kocks-Mecking model. It has been found to be the best-performing model among several trials, and it can be recommended as a viable alternative for simulating the mechanical behavior of engineering structures.
INTERNATIONAL JOURNAL OF MATERIAL FORMING
(2023)
Article
Materials Science, Multidisciplinary
Ozkan Gokcekaya, Takuya Ishimoto, Yuki Nishikawa, Yong Seong Kim, Aira Matsugaki, Ryosuke Ozasa, Markus Weinmann, Christoph Schnitter, Melanie Stenzel, Hyoung Seop Kim, Yoshitsugu Miyabayashi, Takayoshi Nakano
Summary: This study achieved super-solid-solutionized and single crystalline-like TiZrHfNbTaMo bio-high entropy alloy using laser powder bed fusion, resulting in low Young's modulus along < 001 > oriented direction, excellent strength-ductility balance, and good cytocompatibility.
MATERIALS RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Abbas Mohammadi, Payam Edalati, Makoto Arita, Jae Wung Bae, Hyoung Seop Kim, Kaveh Edalati
Summary: In this study, three strategies are combined to achieve excellent strength-plasticity combinations in the presence of hydrogen embrittlement phenomena. First, an FCC high-entropy alloy with slow hydrogen lattice diffusion is selected. Second, aluminum is added to hinder surface-to-bulk hydrogen diffusion. Third, low-mobility lattice defects like nanotwins and Lomer-Cottrell locks are introduced by severe plastic deformation to suppress hydrogen-enhanced localized plasticity and stress concentration. The Al0.1CrFeCoNi alloy severely deformed by high-pressure torsion exhibits an ultrahigh yield strength of 1.96 GPa and a high elongation to failure of 10%.
Article
Chemistry, Physical
Mohammad Sajad Mehranpour, Hamed Shahmir, Hyoung Seop Kim
Summary: One of the most important challenges in materials science is to overcome the trade-off between strength and ductility. Designing alloys with strong precipitates is becoming increasingly popular to address this issue. The brittle sigma phase, which is commonly found in high-entropy alloys, negatively impacts the mechanical properties. In this research, a novel Fe-free high-entropy alloy based on Co-Cr-Ni-Mn-Al is introduced, which has no potential for sigma formation, in order to develop an alloy with a good combination of strength and ductility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Eun Seong Kim, K. R. Ramkumar, G. M. Karthik, Sang Guk Jeong, Soung Yeoul Ahn, Praveen Sathiyamoorthi, Hyojin Park, Yoon-Uk Heo, Hyoung Seop Kim
Summary: In this study, the microstructural evolution, tensile properties, and deformation behavior of additively manufactured equiatomic CoCrFeMnNi high entropy alloy (HEA) were investigated at a cryogenic temperature of 77 K. The results showed that the HEA processed by direct energy deposition (DED) exhibited excellent strength and ductility at 77 K, with exceptional strain hardening, compared to the laser powder bed fusion (LPBF) and wrought samples. The formation of deformation twinning in addition to dislocation slip was observed as the deformation mechanism at 77 K.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Materials Science, Multidisciplinary
Kaveh Edalati, Etsuo Akiba, Walter J. Botta, Yuri Estrin, Ricardo Floriano, Daniel Fruchart, Thierry Grosdidier, Zenji Horita, Jacques Huot, Hai-Wen Li, Huai-Jun Lin, Adam Revesz, Michael J. Zehetbauer
Summary: Magnesium and its alloys are extensively studied for solid-state hydrogen storage, but there are challenges in the kinetics and thermodynamics of hydrogenation and dehydrogenation. Severe plastic deformation methods have been utilized to improve the activation, air resistance, and kinetics of Mg-based hydrogen storage materials by introducing ultrafine/nanoscale grains and crystal lattice defects. These deformed materials, particularly with alloying additives or second-phase nanoparticles, exhibit fast hydrogen absorption/desorption kinetics and good cycling stability. The study also highlights the application of severe plastic deformation methods in hydrogen binding-energy engineering and the synthesis of new magnesium alloys for reversible low/room-temperature hydrogen storage.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Seung Hoon Lee, Seong Gyu Chung, Hyoung Seop Kim, Jung-Wook Cho
Summary: 316L stainless steel was modified by addition of reducing agent and manufactured using laser powder bed fusion. The addition of AlN increased the nitrogen content but decreased the oxygen content. The 316L+AlN steel had larger grains, alumina inclusions, and higher yield strength compared to 316L steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Seyed Amir Arsalan Shams, Geonhyeong Kim, Chong Soo Lee, Hyoung Seop Kim, Hamid Reza Jafarian
Summary: The effect of Si content on the tensile and cyclic deformation behavior of Fe50-xMn30Co10Cr10Six (x = 0-6) as a metastable high-entropy alloy was studied. The tensile properties and deformation mechanisms were not significantly affected by Si content up to 4 at.%, but the cyclic deformation behavior was sensitive to Si content. The addition of Si facilitated the γ to ε-martensite phase transformation and resulted in fatigue lives of more than 10000 cycles at a strain amplitude of 0.7%.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Gang Hee Gu, Min Hong Seo, Hyoung Seop Kim
Summary: A novel continuous process utilizing the concept of strain aging is developed to enhance the strength and elongation of low-carbon steel in the automotive industry and structural materials as a whole.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Ceramics
C. Jia, M. R. Akbarpour, M. Ahmadi Gharamaleki, T. Ebadzadeh, H. S. Kim
Summary: Equiatomic Ni-Ti alloy reinforced with SiC nanoparticles of different volume percentages was synthesized through mechanical alloying and microwave sintering. The addition of SiC nanoparticles increased the content of hard Ni3Ti phase, promoted the stability of the martensite phase, and inhibited matrix grain growth. The high microhardness of the synthesized nanocomposites is attributed to the formation of Ni3Ti and NiTi martensitic phases and their nanocrystalline structure.
CERAMICS INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Jaemin Wang, Sang Guk Jeong, Eun Seong Kim, Hyoung Seop Kim, Byeong-Joo Lee
Summary: This study introduces a method applicable to various powder materials to predict process conditions for achieving high-density products in laser powder bed fusion. A developed XGBoost model and Shapley additive explanations are utilized to analyze the relationship between input features and target values.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Manufacturing
Soung Yeoul Ahn, Farahnaz Haftlang, Eun Seong Kim, Ji Sun Lee, Sang Guk Jeong, Jae Bok Seol, Hyunjoo Choi, Hyoung Seop Kim
Summary: This study investigates cellular structures in TiC/B4C-CoCrFeMnNi high-entropy composites (HECs) fabricated by direct energy deposition (DED) additive manufacturing process and examines the role of TiC and B4C nanoparticles in enhancing mechanical properties. Despite having larger dislocation cell structures and thinner boundaries compared to CoCrFeMnNi high-entropy alloy (HEA), TiC/B4C-CoCrFeMnNi HECs exhibit significantly higher hardness and strength, challenging traditional strength-size relationships. Additionally, the behavior of ceramic nanoparticles (TiC and B4C) with high melting points relative to the matrix CoCrFeMnNi HEA is examined. Rapid scanning prevents full nanoparticle melting, resulting in distinct element distribution in the cell structure. These findings provide insights for selecting suitable nanoceramic particles in HEC development via metal additive manufacturing.
ADDITIVE MANUFACTURING LETTERS
(2023)
Article
Materials Science, Multidisciplinary
M. Farvizi, M. Bahamirian, A. Faraji, H. S. Kim
Summary: This study investigated the influence of Al2O3 particle size on the performance of NiTi-based composites and found that reducing the size of reinforcement particles can improve the hardness and wear resistance of the composites.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
K. R. Ramkumar, Srinivasan Arthanari, Sivakumar Bose, Sang Guk Jeong, S. Sivasankaran, Huseung Lee, Hyoung Seop Kim
Summary: This study developed Al2O3 reinforced alpha-brass nanocomposites using spark plasma sintering and evaluated their electrochemical properties in a corrosive solution. The results showed that the uniformly dispersed Al2O3 particles in 3 wt.% Al2O3 nanocomposites reduced galvanic coupling, resulting in improved corrosion resistance and passivation behavior.
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
