Article
Materials Science, Multidisciplinary
Rongchuang Chen, Shiyang Zhang, Min Wang, Xianlong Liu, Fei Feng
Summary: It is important to develop constitutive models that reflect microstructure evolution for accurately predicting material flow and microstructure evolution during forming processes. In this study, a constitutive model considering microstructure evolution was proposed and found to improve prediction precision when the stress-strain curve was modeled as exponential in the work-hardening stage. Additionally, models describing recrystallization kinetics and average grain size were constructed, enabling higher accuracy in predicting stress-strain curves.
Article
Geochemistry & Geophysics
Zhi Dou, Yimin Liu, Xueyi Zhang, Yashan Wang, Zhou Chen, Jinguo Wang, Zhifang Zhou
Summary: The study revealed that the layer transition zone in multilayered slopes plays a crucial role in affecting slope stability by reducing hydraulic conductivity, increasing pore water pressure, and contributing to instability during rainfall events. The analysis showed that a critical thickness of the layer transition zone exists, impacting the maximum failure area of the slope and the corresponding hydraulic conductivity decreasing by 1%-2.5% when the thickness ratios were between 2.5% and 5%.
Article
Nanoscience & Nanotechnology
Haiyang Wang, Qiang Zhu, Qingshuang Ma, Gang Chen, Lingjiang Cui, Peng Zhang, Chuanjie Wang
Summary: This study investigates the size effects on flow stress and deformation mechanism of micro components made of pure titanium thin sheets. The results show that the feature size has a significant impact on the flow stress and deformation mechanism of pure titanium sheet. The research provides important insights for understanding and accurately controlling the microforming process of pure titanium thin sheets.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
H. R. Rezaei Ashtiani, A. A. Shayanpoor
Summary: A new constitutive model was proposed to accurately describe the hot flow behavior of AA1070 aluminum under different conditions, considering various influencing factors and validated through experiments.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Nanoscience & Nanotechnology
Xinfang Zhang, Shuai Zhou, Hexiong Zhang, Xuebing Liu, Huajie Yang
Summary: The study investigated the relationship between Luders strain and average grain size in an Al-5.16Zn-2.2Mg1.46Cu alloy under pulsed electric current. It was found that Luders strain increases as average grain size decreases, and the current parameter significantly affects the Hall-Petch-like relationship. A mathematical model was established to explore the competition between solute atom pinning and dislocation depinning behaviors under different current densities, showing a significant impact on Luders strain.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Amos Muiruri, Maina Maringa, Willie du Preez
Summary: In this study, a microstructure-based constitutive model was developed and validated to predict the high strain rate flow properties of additively manufactured Ti6Al4V(ELI) alloy. The model showed good capacity to describe the interrelationships between microstructural features, field variables, and mechanical properties, by taking into account grain sizes, dislocation densities, and viscous drag effect.
Article
Materials Science, Multidisciplinary
Tao Zhang, Lan Yan, Lianjie Li, Mingshuai Huo, Hui Wu, Xuming Zha, Ningchang Wang, Xian Wu, Feng Jiang, Zhengyi Jiang, Xipeng Xu
Summary: Grain refinement has a significant impact on mechanical properties, and establishing the relationship between grain evolution and plastic behavior is essential. Through experimental research, it was found that the grain size has a significant influence on the yield stress, strain rate sensitivity, and thermal softening. Based on these findings, a new constitutive model was developed to accurately predict the mechanical behavior of the material.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Ziyu Wang, Kaoshi Zhang, Yanqiao Song, Raneen Abd Ali, Wenliang Chen, Xingxing Wang
Summary: This study investigated the mechanical behavior and microstructure evolution of 2060 Al-Li alloy under high strain rates. The results showed that high strain rates led to increased dislocation density and grain refinement in the alloy, as well as affected the structure of grain boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Eli Saul Puchi-Cabrera, Jean-Dominique Guerin, Jose Gregorio La Barbera-Sosa, Mirentxu Dubar, Laurent Dubar
Summary: The study investigated the effect of the austenitic grain size on the flow stress behavior of steel, with experimental results showing parameters such as the strength of grain boundaries and the effect on dynamic recrystallization. A novel methodology for analysis and a discussion on the importance of recrystallization time were also presented.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Nathan M. Heckman, Alejandro Barrios, Christopher M. Barr, David P. Adams, Timothy A. Furnish, Khalid Hattar, Brad L. Boyce
Summary: Fatigue-induced grain growth can be suppressed by adding specific solutes to stabilize grain boundaries. This study compares the high-cycle fatigue performance of Pt-10at%Au alloy with pure Pt and finds that the Pt-10Au alloy exhibits significant improvement in fatigue life and crack initiation resistance compared to pure Pt.
Article
Chemistry, Physical
Rongchuang Chen, Shiyang Zhang, Xianlong Liu, Fei Feng
Summary: The study investigated the flow behavior of 300M steel under tension through hot uniaxial tensile tests at different temperatures and strain rates. Compared to compression tests, tensile flow stress was higher and ultimate elongation of 300M steel was influenced by temperature and strain rate. A constitutive model based on the modified Arrhenius model showed good accuracy with an average deviation of 6.81 MPa.
Article
Engineering, Electrical & Electronic
Hengjia Zhang, Xiaomin Zhang, Zhipeng Zhao, Hongwu Tang, Bo Zhao
Summary: This work aims to study the evolution of grain size gradient and its impact on the mechanical and electrical properties of metal interconnects under high current density. A potential accelerated test method and a phase field grain growth model were proposed to investigate the path and mechanism of grain gradient evolution. The numerical assessment showed reliable results, indicating that the strength of the gradient microstructure can be increased without sacrificing ductility.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Mechanics
Xu Long, Kainan Chong, Yutai Su, Leiming Du, Guoqi Zhang
Summary: The stress-strain response of sintered silver nanoparticles (AgNP) materials is precisely characterized in order to adapt for numerical analysis and rational design of electronic packaging structures in this study. A framework of crystal plasticity finite element method (CPFEM) is established based on the mechanism of crystal plastic deformation to describe the mesoscopic structural influence of grain evolution on the macroscopic properties of sintered AgNP materials. This study sheds light on the morphology design of sintered AgNP with optimized mechanical properties and fatigue resistance.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Juanjuan Han, Wei Zheng, Shubo Xu, Guanghan Dang
Summary: In this study, a regionalized constitutive model based on surface layer model and intragranular heterogeneities was established, and crystal plasticity simulations of micro-tensile processes were conducted using a 3D Voronoi model. The numerical simulations of micro-tensile tests of pure copper were performed using finite element methods. The results were in good agreement with experimental data, confirming the accuracy of the proposed models and providing new insights into size effects in micro-forming processes.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
Jun-Yuan Zheng, J. Q. Ran, M. W. Fu
Summary: Traditional macro-scaled plasticity theories may not be fully valid in meso-/micro-scaled deformation studies due to size effects. The anisotropy of individual grains significantly affects the mechanical responses of polycrystalline metallic materials. Microcracks mainly initiate at grain boundary regions and grow along grain boundaries in meso-/microforming.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Kyungmin Noh, Seyed Amir Arsalan Shams, Wooyeol Kim, Jae Nam Kim, Chong Soo Lee
Summary: The study aimed to analyze the effects of microstructure on the resistance of low-carbon steels to low-cycle fatigue and extremely low-cycle fatigue (ELCF). Different microstructures showed different fatigue resistance properties, with ferrite-pearlite performing best in ELCF resistance and ferrite-bainite-martensite exhibiting higher ELCF resistance when considering tensile strength.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Geonhyeong Kim, Seyed Amir Arsalan Shams, Jae Nam Kim, Jong Woo Won, Seong Woo Choi, Jae Keun Hong, Chong Soo Lee
Summary: The low-cycle fatigue behavior of a cryogenic-rolled commercially pure titanium alloy was investigated, showing that increasing the volume fraction of deformation twins through pre-deformation significantly improved the low-cycle fatigue resistance. The formation of smaller dislocation cells in the pre-deformed microstructure led to more severe crack arrest.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Gyeong Hyeon Jang, Kitae Kwon, Wooyeol Kim, Sangho Uhm, Taekyung Lee, Chong Soo Lee
Summary: The study found that Type-B liquid metal embrittlement (LME) cracks did not affect the high-cycle fatigue resistance of spot-welded TRIP steel plates, with the crack initiation site remaining unchanged at the sample notch.
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
(2021)
Article
Chemistry, Physical
Hyun Joo Seo, Jae Nam Kim, Jang Woong Jo, Chong Soo Lee
Summary: This paper quantified the effect of tempering duration on the hydrogen embrittlement resistance of vanadium-added tempered martensitic steel. The study showed that characteristics of V-carbide greatly affect the HE resistance, with the greatest resistance observed at the peak aging condition of 4 hours.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Ye Jin Kim, Young Min Kim, Seong-Gu Hong, Dae Woong Kim, Chong Soo Lee, Sung Hyuk Park
Summary: The SEN9 alloy exhibits finer grains and more abundant particles, resulting in slightly higher tensile strength compared to the AZ91 alloy. However, the difference in strength between the two alloys is relatively small as the effects of solid-solution hardening and precipitation hardening in the AZ91 alloy offset the effects of grain-boundary hardening and dispersion hardening in the SEN9 alloy to some extent.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Seyed Amir Arsalan Shams, Geonhyeong Kim, Jong Woo Won, Jae Nam Kim, Hyoung Seop Kim, Chong Soo Lee
Summary: The effect of grain size on the tensile and cyclic deformation behaviors of carbon-containing CoCrFeMnNi high-entropy alloys was studied. Different microstructures with varying average grain sizes were obtained through heat treatment, showing that refining the grain size can increase strength and extend fatigue life. However, the presence of coarse carbides in the microstructure can reduce fatigue life, indicating that controlling the thermomechanical treatment to achieve fine-grained microstructures without precipitation of coarse carbides is essential for improving fatigue life in carbon-containing high-entropy alloys like Cantor.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Correction
Multidisciplinary Sciences
Nhung Thi-Cam Nguyen, Peyman Asghari-Rad, Praveen Sathiyamoorthi, Alireza Zargaran, Chong Soo Lee, Hyoung Seop Kim
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Seyed Amir Arsalan Shams, Jae Wung Bae, Jae Nam Kim, Hyoung Seop Kim, Taekyung Lee, Chong Soo Lee
Summary: This study investigated the deformation behaviors and microstructural evolutions of an interstitial metastable high-entropy alloy under monotonic and cyclic deformation modes. The presence of carbon and the appearance of deformation-induced epsilon-martensite were found to contribute to the superior combination of strength and ductility in the alloy. The microstructure of the alloy varied between coarse-grained and fine-grained depending on the deformation mode. The strain amplitude also influenced the fatigue life of the alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Man Jae Sagong, Eun Seong Kim, Jeong Min Park, Gangaraju Manogna Karthik, Byeong-Joo Lee, Jung-Wook Cho, Chong Soo Lee, Takayoshi Nakano, Hyoung Seop Kim
Summary: Recently, direct energy deposition (DED) has gained attention in metal additive manufacturing for its ability to produce multi-materials and composition gradient materials with geometrical design freedom and high productivity. This study used DED processing to fabricate layered multi-materials of austenitic stainless steel (SS316L) and nickel-based superalloy (IN718). The resulting multi-materials exhibited a 500 μm thick composition gradient material zone (CGZ) at the SS316L/IN718 interface due to dilution. Fine cracks containing brittle phases were observed in the CGZ closer to the SS316L side. Despite the cracks, the multi-material samples showed higher yield strength and ultimate tensile strength than those predicted by rule-of-mixtures, attributed to hetero-deformation-induced hardening near the CGZ.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Seyed Amir Arsalan Shams, Gyeonghyeon Jang, Jae Wung Bae, Auezhan Amanov, Hyoung Seop Kim, Taekyung Lee, Chong Soo Lee
Summary: The low-cycle fatigue life and cyclic deformation behavior of a metastable high-entropy alloy were investigated. The effects of ultrasonic nanocrystal surface modification (UNSM) process on tensile properties and fatigue life were evaluated. The study found that the fatigue life of the alloy was comparable to that of CoCrFeMnNi alloy, and mechanical twins in cyclic loads appeared only at high strain amplitudes. Additionally, while the UNSM process increased the yield strength of the alloy, it also accelerated fatigue crack initiation and degraded fatigue crack growth resistance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Jang Woong Jo, Jae Nam Kim, Chong Soo Lee
Summary: This paper presents a method to increase the hydrogen-embrittlement resistance of martensite steel using partial phase transformation and tempering. The resulting dual-tempered martensitic (DTM) steel showed higher HE resistance and strength compared to conventional tempered martensite (TM) due to the presence of specific precipitates.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Geonhyeong Kim, Taekyung Lee, Seyed Amir Arsalan Shams, Jae Nam Kim, Seong Woo Choi, Jae Keun Hong, Chong Soo Lee
Summary: This study developed a heterogeneous-structured (HS) Ti-6Al-4V alloy composed of coarse and fine grains to enhance mechanical properties. The HS alloy had higher strength and better resistance to low-cycle fatigue compared to a commercial mill-annealed coarse-grained (CG) alloy, while also maintaining ductility. It offered an engineering advantage of low-cost mass production compared to an ultrafine-grained (UFG) counterpart. The enhanced mechanical properties of the HS alloy were attributed to the presence of an ultrafine-grained region and partial transformation of texture.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(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
Crystallography
Hamed Shahmir, Parham Saeedpour, Mohammad Sajad Mehranpour, Seyed Amir Arsalan Shams, Chong Soo Lee
Summary: One important issue in materials science is the balance between strength and ductility in engineering alloys, and creating heterogeneous and complex microstructures is an effective method to achieve this. In this study, a CoCrFeNiMn high-entropy alloy was processed through cold rolling and post-deformation annealing at temperatures ranging from 650-750 degrees C, resulting in a wide range of grain sizes. Annealing at 650 degrees C produced a heterogeneous structure with recrystallized areas of ultrafine and fine grains and non-recrystallized areas with an average size of around 75 μm. The processed material exhibited a combination of high strength (over 1 GPa) and uniform elongation (over 12%), which was attributed to different deformation mechanisms such as dislocation slip, deformation twinning, and hetero-deformation-induced hardening. Increasing the annealing temperature to 700 degrees C allowed for the acquisition of bimodal grain size distributions (around 1.5 and 6 μm), while annealing at higher temperatures eliminated the heterogeneous structure and led to a significant decrease in strength.
Article
Materials Science, Multidisciplinary
Minseob Kim, Seong Ho Lee, Jinyeong Yu, Seho Cheon, Sujeong Byun, Chong Soo Lee, Taekyung Lee
Summary: This study investigated the microstructural kinetics induced by electropulsing treatment (EPT) of Ti-6Al-4V alloy and found that EPT enhances several aspects of microstructural evolution, leading to improved mechanical performance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
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)