Article
Nanoscience & Nanotechnology
Xicong Ye, Zihao Cheng, Chang Liu, Xin Wu, Luer Yu, Mengyu Liu, Dong Fang, Guangwei Zhao, Bo Li
Summary: The emergence of eutectic high entropy alloys (EHEAs) has led to the design and preparation of a set of low-cost Co-free Fe55Cr15Ni(30-x)Nbx (x = 0, 3, 6, 9, 12, and 15 at.%) EHEAs in this study. The addition of Nb content affects the solidification structure and mechanical properties of the alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Benbin Xin, Aijun Zhang, Jiesheng Han, Junyan Zhang, Junhu Meng
Summary: Boron doping has a significant influence on the phase evolution, microstructure transformation, and mechanical properties of High entropy alloys (HEAs), leading to enhanced strength and hardness through synergistic strengthening mechanisms.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Jiyeon Kang, Nokeun Park, Jin-Kyung Kim, Joo Hyun Park
Summary: The study focuses on microstructures and mechanical properties of high entropy alloy (CoCrFeMnNi)95.2Al3.2Ti1.6 after homogenization and cold-rolling, followed by annealing at various temperatures. The annealing process revealed the presence of different phases based on temperature, leading to changes in grain size, strength, and ductility. Fully recrystallized materials at 900°C exhibited lower grain size but higher ductility due to second phase particles, impacting the yield strength significantly.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Lu Zhang, Li Zhang, Hao Wang, Jianbo Li, Jiale Man, Zaidong Xu, Jianxin Yu, Gang Wan, Wei Wang, Baolin Wu
Summary: This study examined the evolution of microstructure and mechanical properties of a high-entropy alloy and provided valuable insights on predicting sigma-phase formation in alloy design. Interaction between alloying elements and principal elements can affect recrystallization, leading to formation of partially recrystallized microstructures across a wider temperature range. Control of the proportion of recrystallized and non-recrystallized grains is crucial in managing strength and ductility, with factors like sigma particles and deformation twinning influencing alloy characteristics.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Gang Liu, Xinlei Miao, Cao Wang, Zhenhua Han, Shikun Li, Xin Yang, Zhenhuan Gao, Gongxian Yang, Guojun Zhang
Summary: In this study, (CoCrFeNi)(94)Ti2Al4 high entropy alloy was fabricated and samples with different grain sizes were obtained through annealing treatments. The results showed that the fine-grained specimens had higher yielding strength and tensile strength after aging treatments, along with good elongation.
Article
Materials Science, Multidisciplinary
Fangjie Li, Yeyu Sha, Jiuxiao Li, Dongye Yang, Xin Zeng, Xie Zhou, Qin Shen, Min Liu
Summary: This study investigates the influence of recrystallisation and sigma phase precipitation on the mechanical properties of an equiatomic CoFeNiMnV high-entropy alloy. The results show that V is more effective than Cr in stabilising the sigma phase. Sigma phase precipitation occurs before recrystallisation during the annealing process. The combined effect of sigma phase precipitation strengthening and recrystallisation softening affects the mechanical behaviour of the alloy. The strength decreases with increasing annealing temperature, attributed to increased recrystallisation percentage.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yuankui Cao, Weidong Zhang, Bin Liu, Yong Liu, Meng Du, Ao Fu
Summary: The study shows that thermomechanical processing can lead to phase decomposition in refractory high entropy alloys, affecting both room temperature and high temperature mechanical properties; the impact of precipitates on room temperature strength depends on the competition between precipitation strengthening and solid solution strengthening.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Matthew Luebbe, Jiaqi Duan, Fan Zhang, Jonathan Poplawsky, Hans Pommeranke, Maalavan Arivu, Andrew Hoffman, Mario Buchely, Haiming Wen
Summary: Recent studies have shown that precipitation-hardened high-entropy alloys (HEAs) exhibit high strength and thermal stability, making them promising for high-temperature applications like nuclear reactors. However, many HEAs contain unsuitable cobalt (Co) due to its long-term activation issue and high cost. This study developed a Co-free (Fe0.3Ni0.3Mn0.3Cr0.1)(88)Ti4Al8 HEA, which exhibited a complex four-phase structure and a compressive strength of 2151 MPa. B2 and chi phases provided significant strengthening effects, while gamma ' nanoparticles also contributed to the alloy's strength. This research lays the foundation for further development of Co-free HEAs with improved ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Lo -Chi Chang, Ying-Chou Lu, Chun-Hway Hsueh
Summary: This study investigates the effects of Al addition on the phase evolution, morphology, and mechanical properties of (NbTiVZrN)100-xAlx high-entropy alloy nitride films (HEANFs). The addition of Al leads to the development of a FCC structure with a preferred orientation of (Nb, Zr)N(111). The mechanical properties, including hardness, reduced modulus, and fracture toughness, improve with increasing Al content, reaching maximum values at x = 3.6. The coefficient of friction decreases as the Al content increases from 0 to 4 at.%.
Article
Engineering, Multidisciplinary
Li ChunHui, Wang MingLiang, Zhang HuanZhi, Zhang GuoJia, Li TianXin, Lu YiPing, Li TingJu
Summary: The novel Al0.5V0.1FeCrMnNi0.9 high-entropy alloy demonstrates exceptional strength and plasticity, with coherent precipitation enhancement contributing to its superior performance. The alloy exhibits high compressive yield strength, fracture strength, and fracture strain, along with a strength and plasticity product that surpasses most reported high-entropy alloys.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Nanoscience & Nanotechnology
Z. Y. Jia, S. Z. Zhang, J. T. Huo, C. J. Zhang, L. W. Zheng, F. T. Kong, H. Li
Summary: In this study, a non-equiatomic Ni46Co24Fe24Al3Ti3 medium entropy alloy was prepared by vacuum suspension melting. After thermo-mechanical processing, the alloy exhibited excellent mechanical properties, which can be attributed to its unique microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Hongchao Li, Jun Wang, Haoxue Yang, Mengmeng Zhao, William Yi Wang, Ruihao Yuan, Jinshan Li
Summary: This study investigated the effect of thermomechanical treatments on the mechanical properties of high-entropy alloy Al0.5CoCrFeNi. The results showed that the nanoscale B2 phases formed through aging significantly enhanced the strength of the alloy, and pre-deformation facilitated the formation of B2 phases and further improved the strength of the alloy.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Linxiang Liu, Zhijun Wang, Qingfeng Wu, Yuhao Jia, Q. Xu, Feng He, Junjie Li, Jincheng Wang
Summary: A dual-phase high entropy alloy with FCC and B2 matrix was developed, showing excellent high-temperature mechanical properties. The hierarchical microstructure contributed to high yield strength and good tensile elongation at a wide temperature range, making it a potential material for high-performance applications.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Ming-Wei Wu, Yu-Cheng Fu, Yi-Ling Lin, Chia-Yu Lin, Chi-San Chen
Summary: By adding 0.8wt% B, the sinterability and mechanical properties of AlCoCrFeMoNi HEA powder can be significantly improved, reducing porosity and increasing density, leading to better microstructure. Boron facilitates the liquid phase sintering (LPS) effect in AlCoCrFeMoNi alloy, enhancing its strength and toughness.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Akshay D. Nakhate, Nikhil Kumar, Prince Sharma, Prabhat Chand Yadav
Summary: There has been a growing interest in high-entropy alloys (HEAs) due to their unique compositions and customizable properties. This study investigated the microstructure and deformation behavior of the CoCrFeMnNi HEA under different rolling conditions. The results showed that multi-step cross-rolling can effectively enhance the strength and ductility of HEAs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Hyung Keun Park, Yongju Kim, Jeong Min Park, Kei Ameyama, Hyoung Seop Kim
Summary: A harmonic structured material (HSM) with coarse-grained core and fine-grained shell microstructure was designed using a numerical model to simulate the deformation behavior of heterostructured materials. The model considered the pile-up of geometrically necessary dislocations (GNDs) near grain boundaries to implement the hetero-deformation induced (HDI) strengthening feature. The finite element analysis supported the experimental results and described the strain partitioning near the core-shell boundaries in the HSM. The optimal harmonic microstructure was investigated using machine learning (ML), and the correlation between microstructures and mechanical properties was established through Bayesian inference. A new HSM, predicted to have the best combination of strength and ductility, was successfully manufactured and exhibited superior mechanical performance compared to previous designs.
Article
Nanoscience & Nanotechnology
Jungwan Lee, Jeong Min Park, Jongun Moon, Hyojin Park, Hyoung Seop Kim
Summary: Impact toughness at ambient and cryogenic temperatures was investigated for CuFeMn and Al15(CuFeMn)85 immiscible medium-entropy alloys. These alloys exhibited different impact toughness behavior at different temperatures and showed higher impact toughness values compared to dual-phase steels with similar strength levels.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Gang Hee Gu, Yongju Kim, Min Hong Seo, Hyoung Seop Kim
Summary: Plastic strain ratio, a material property that estimates the mechanical anisotropy and drawability of metal sheets, is needed even in large deformation regimes.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Sujung Son, Jaeik Kwak, Farahnaz Haftlang, Hyeonseok Kwon, Yong-Tae Kim, Sunghak Lee, Hyoung Seop Kim
Summary: The corrosion properties and passivation layer of VCrFeCoNi medium-entropy alloy (V-MEA) were investigated in this study. The V-MEA exhibited a corrosion current density of -0.101 mA and a corrosion potential of -0.336 V, with a broad passivation region of -0.763 V. The V-MEA showed a multilayer passivation with a vanadium oxides-rich outer layer and a chromium oxide-rich inner layer. The outer layer acted as a cation-selective layer to prevent Cl- ions, while the inner layer acted as an anion-selective species to capture the Cl- ions. As a result, fewer Cl- ions could penetrate the passivation layer, leading to the broad passivation region of the V-MEA.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Medicine, General & Internal
Dougho Park, Mun-Chul Kim, Daeyoung Hong, Yong-Suk Jeong, Hyoung Seop Kim, Jong Hun Kim
Summary: This study aimed to explore the long-term risk of recurrence and mortality in patients with acute ischemic stroke (AIS), acute myocardial infarction (AMI), or acute hemorrhagic stroke (AHS). The results showed that the risk of developing secondary AIS was significantly lower in the AMI and AHS groups compared to the AIS group. The risk of developing secondary AMI was also significantly lower in the AMI and AHS groups compared to the AIS group. Initial AHS was a decisive risk factor for developing secondary AHS. Furthermore, AMI and AHS were more closely related to long-term mortality than AIS.
JOURNAL OF CLINICAL MEDICINE
(2023)
Article
Materials Science, Multidisciplinary
Hyeonseok Kwon, Praveen Sathiyamoorthi, Manogna Karthik Gangaraju, Alireza Zargaran, Jaemin Wang, Yoon-Uk Heo, Stefanus Harjo, Wu Gong, Byeong-Joo Lee, Hyoung Seop Kim
Summary: In this work, a novel Fe-based medium-entropy alloy was designed based on the characteristics of maraging steels. By a single-step aging at 650 celcius for 10 min, the alloy exhibited microstructures consisting of high-density nanoprecipitates and reverted FCC phase, resulting in ultrahigh yield strength and good ductility.
Article
Materials Science, Multidisciplinary
Jihye Kwon, Olivier Bouaziz, Hyoung Seop Kim, Yuri Estrin
Summary: Crumpled metallic thin foils have great potential as weight-saving and energy-absorption materials, but further research is needed on their crumpling process and mechanical behavior, considering their complex internal structures. This study presents two possible computational strategies for simulating crumpled materials under closed-die compression. The analysis shows that the continuum-based approach is more suitable for representing the macroscopic mechanical behavior of crumpled materials within a certain range of relative densities. The porous continuum approach also offers the benefits of low computational cost and high efficacy. However, the direct method is preferable when accurately reproducing internal structural pattern changes is necessary, such as for predicting mechanical response under complex loading conditions.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jae Heung Lee, Hyeonseok Kwon, Praveen Sathiyamoorthi, Sujung Son, Hyoung Seop Kim
Summary: To enhance the tensile properties of Al0.3CoCrNi (at%) medium-entropy alloys at room temperature, high-pressure torsion (HPT) and appropriate annealing are employed. Severe deformation induced by HPT leads to the formation of fine-grained structure and nanometer-scale B2 and sigma precipitates, which result in a synergistic combination of high yield strength (>1.0 GPa) and large uniform elongation (>25%) by utilizing grain refinement and precipitation strengthening simultaneously.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Zhiqin Yang, Jianxing Bao, Chaogang Ding, Sujung Son, Zhiliang Ning, Jie Xu, Debin Shan, Bin Guo, Hyoung Seop Kim
Summary: Electrically assisted deformation (EAD) is used to improve the formability and prevent cracking in the processing of Al0.6CoCrFeNiMn high entropy alloy (HEA) at room temperature. The study systematically investigates the electroplasticity of the HEA through electrically assisted uniaxial tension. Results show that pulse current increases sample temperature and enhances flow stress and elongation. This study confirms that EAD effectively improves the formability of HEAs and provides guidance for their component forming.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
D. H. Chung, J. Lee, Q. F. He, Y. K. Kim, K. R. Lim, H. S. Kim, Y. Yang, Y. S. Na
Summary: The study investigates the toughening/strengthening mechanisms of heterostructured eutectic high-entropy alloys (EHEAs) and discovers that fully eutectic HEAs show superior performance in both yield stress and fracture toughness due to the high hetero-deformation-induced (HDI) strengthening/toughening associated with a high misorientation angle at the grain/phase boundaries.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Medicine, General & Internal
Dougho Park, Chan Woong Jang, Han Eol Cho, Jong Hun Kim, Hyoung Seop Kim
Summary: In South Korea's Long-Term Care Insurance (LTCI) system, the special dementia rating (SDR) is a registration grading for dementia patients without physical disability or functional restrictions, and it is the first applicable registration after diagnosis. This study investigated the relationship between educational level and residential area with the age of SDR registration and dementia diagnosis. The results showed that lower education level and rural residency were associated with older age at diagnosis and SDR registration, while higher education level and urban residency were associated with younger age at diagnosis and SDR registration. This suggests that cognitive decline sensitivity and medical accessibility play a role in the early diagnosis and registration of dementia.
Article
Materials Science, Multidisciplinary
Hyojin Park, Jungwan Lee, Rae Eon Kim, Sujung Son, Soung Yeoul Ahn, Hyoung Seop Kim
Summary: This study investigates the impact of warm rolling on the microstructure and tensile properties of Fe60(CoNi)30Cr10 Fe-based medium entropy alloy (Fe-MEA). The results show that the warm-rolled sample has coarse elongated grains, deformation-induced martensite, and a high density of dislocations. Tensile tests demonstrate that the warm-rolled Fe-MEA exhibits enhanced strength and a similar level of elongation compared to the annealed sample. The study suggests that warm rolling shows potential as a processing technique to improve the mechanical properties of Fe-MEA for broader applications.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Amin Radi, Canay Isil, S. Vegar Seyedmohammadi, Hyoung Seop Kim, Guney Guven Yapici
Summary: This study investigates the influence of secondary phases and dislocation substructures in high entropy alloys (HEAs) and achieves exceptional mechanical properties by controlling microstructure, grain size, and dislocation substructure. The results highlight the importance of grain size in facilitating the generation of necessary dislocations during plastic deformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Hamed Shahmir, Shabnam Kazemi, Mohammad Sajad Mehranpour, Hyoung Seop Kim
Summary: The effect of Al addition on the microstructure of a CoCrFeNiMn high-entropy alloy was investigated using a novel approach. The formation and stability of phases were examined through heat treatment and CALPHAD predictions. This method is significant for alloy design as it allows for a quick study of phase evolution in complex multi-component alloys.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Jeong Min Park, Hyeonseok Kwon, Jungho Choe, Kyung Tae Kim, Ji-Hun Yu, Yoon-Uk Heo, Hyoung Seop Kim
Summary: This study presents a guideline for alloy design in additive manufacturing, aiming to produce high-quality products with excellent mechanical performance by utilizing the unique segregation engineering of LPBF-driven microstructures. Mo-doping enhances the strength and ductility of ferrous medium-entropy alloys.
SCRIPTA MATERIALIA
(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)
