Article
Materials Science, Multidisciplinary
A. Zavodov, N. A. Nochovnaya, A. A. Lyakhov, E. Filonova
Summary: The study found that the presence of deformation bands in a rolled plate of VTI-4 alloy significantly affects the ultimate tensile strength of the material, with a reduction of 3-6% when the fraction of DB in the sample cross section is 30-40%. The distribution of strength in the plate is determined by the presence of DB and the fraction of its area in the sample cross section.
MATERIALS CHARACTERIZATION
(2021)
Article
Mechanics
Bulat N. Galimzyanov, Anatolii Mokshin
Summary: The porous titanium nickelide is characterized by unique physical and mechanical properties, and the degree of porosity affects its mechanical behavior under tension, compression, and shear. Different types of pore structures influence the elastic characteristics and resistance to tensile and shear, providing insights for developing and improving amorphous metal foams.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Yu Zhou, Yongchao Liang, Lili Zhou, Zean Tian, Qian Chen, Yunfei Mo
Summary: The effects of pore diameter and B2-NiTi crystal on the compressive deformation of Ni50Ti50 metallic glasses are studied by molecular dynamics simulation. The presence of pores inhibits stress reduction and induces the formation of high shear strain atoms and shear bands. Larger pore diameters result in lower yield strengths and increased plasticity. The B2-NiTi crystal reduces deformation and impedes the propagation of shear bands, leading to improved plasticity. These findings provide theoretical guidance for the development of metallic glasses with improved plasticity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Jongchan Yoon, Younggeun Jang, Kangsik Kim, Jaemin Kim, Seungwoo Son, Zonghoon Lee
Summary: This study reports on the tensile and fracture behavior of monolithic ultra-thin amorphous carbon (a-C) films, revealing their large plastic strain and high strength. The plasticity is found to be associated with an increased nanoporosity and larger graphitic cluster size, which likely contributes to stiffening of the a-C film. Despite the large plastic strain, catastrophic failure still occurs.
Article
Materials Science, Multidisciplinary
Yuzhe Wang, Jian Chen, Rengen Ding, Weili Wang, Jiahua He, Xueyang Zhou
Summary: The effect of cold rolling on the microstructural evolution and mechanical properties of a novel high entropy alloy (Fe50Mn30Co10Cr10)97C2Mo1 was investigated. The results show that cold rolling increases the dislocation density, decreases the width and spacing of deformation twins, and increases the volume fraction of shear bands. This microstructural evolution leads to an increase in yield strength and a decrease in ductility of the alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
C. Y. Zhang, G. Yuan, Y. X. Zhang, C. Y. Liu, F. Fang, G. D. Wang, R. D. K. Misra
Summary: This study continuously prepared Cu-based amorphous alloy plates using twin-roll strip casting method, showed that the plates have good surface quality and shape, and demonstrated excellent bending and compression plasticity achieved through multiple shear bands.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Yabo Fu, Haonan Chen, Renqing Guo, Yuanding Huang, Mohammad Reza Toroghinejad
Summary: The study investigated the microstructure and mechanical properties of Zr-based alloys prepared by vacuum suction-cast, revealing that the alloy with gradient amorphous structure exhibited exceptional strength and ductility, with a maximum compressive strength of 1811.7 MPa and a plastic strain of 23.6%. The enhancement of strength was attributed to the presence of nanoscaled amorphous particles, oxide nanoparticles, and the toughening phase CuZr in the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Jun Zhou, Tinghui Jiang, Hengcheng Liao, Hao Chen, Jiwei Zheng, Yabo Zhang, Weijun Zhu
Summary: The effect of titanium-alloying on the microstructure and mechanical properties of Fe35Ni35Cr20Mn10 high-entropy alloy (HEA) was studied. It was found that the addition of titanium resulted in improved yield strength and excellent ductility. The refinement of grains induced by titanium-alloying and the coordinated deformation between eta flakes and matrix were responsible for the excellent performance.
Article
Physics, Applied
Shichao Zhou, Peter K. Liaw, Yunfei Xue, Yong Zhang
Summary: The mechanical behavior of Al0.5Cr0.9FeNi2.5V0.2 HEA was systematically investigated at elevated temperatures, showing a decrease in strength but an increase in ductility as temperature increased due to dynamic restoration. Different deformation accommodation abilities along grain boundaries influence the material's mechanical properties.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Jianwei Chen, Le Wang, Qunbo Fan, Zhuoyue Sang, Yao Xu, Changhao Wang, Jiahao Yao, Zhiming Zhou, Liu Yang, Zheng Liu, Jinliang Gao, Heyong Feng
Summary: The effect of heat treatment on a novel alpha + beta Ti-6.2Al-0.8V-2.25Mo-1.2Cr-0.5Si (wt%) alloy's microstructure and mechanical properties was investigated in this study. Different solution and aging treatments were conducted to identify the microstructure and crystalline structure of the alloys using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that a multi-scale microstructure containing equiaxed primary alpha (alpha p) phase and nano-scale acicular secondary alpha (alpha s) phase was achieved in the heat-treated samples. The optimal combination of strength and ductility was observed after specific solution and aging treatments.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Xiguang Deng, Deliang Zhang, Qingyang Jiao, Songxiao Hui, Wenjun Ye, Lina Zou, Zhisheng Nong
Summary: The Schmid factors of grains in a Ti-2Al alloy were determined and used to investigate the twinning behavior during deformation at different temperatures. It was found that the fraction of twinned grains decreased with increasing deformation temperature. The critical resolved shear stress required to activate twinning was calculated and found to decrease linearly with increasing deformation temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Z. Q. Chen, M. C. Li, X. Tong, Y. Zhao, J. Y. Xie, S. W. Guo, P. Huang, F. Wang, H. B. Ke, B. A. Sun, W. H. Wang
Summary: This study captures and observes a nano shear band (NSB) structure in crystalline-layer confined amorphous (CLCA) alloy films, and finds that it enhances crystallization, hardening, and toughening effects. It provides new insights into understanding the microscopic deformation mechanism of amorphous alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Long Zhang, Tingyi Yan, Daniel Sopu, Yi Wu, Binbin Jiang, Kui Du, Haifen Zhang, Juergen Eckert
Summary: This study investigates the influence of crystal behavior and properties on the mechanical properties of two types of metallic glass composites (MGCs). The deformation characteristics of crystals significantly alter the morphology and properties of shear bands (SBs) in the glass matrix. Crystals deforming via dislocations result in narrow and sharp SBs, while shape memory crystals with martensitic transformations exhibit continuously broadening SBs. The broadening and bifurcation of SBs play a crucial role in the superior mechanical properties of shape memory MGCs.
Article
Materials Science, Multidisciplinary
A. S. Aronin, O. I. Aksenov, D. V. Matveev, E. A. Pershina, G. E. Abrosimova
Summary: The formation of shear bands and their relationship with surface steps in an amorphous alloy under rolling were investigated using scanning, transmission electron, and atomic force microscopy. It was found that shear bands initiated from surface steps with a thickness of approximately 10 nm, which varied in different locations. Secondary shear bands were also observed, located at an angle of 70 degrees to the shear band coming out to the surface. The regions of shear bands exhibited light and dark contrast, indicating a change in the density of the amorphous phase along the shear band. The surface steps had a complex shape and were composed of elementary steps, with thickness corresponding to that of the shear band.
Article
Materials Science, Ceramics
Yanming Zhang, Haidong Liu, Siddharth Sundararaman, Liping Huang, Yunfeng Shi
Summary: Through classical molecular dynamics simulations, it was found that consolidated amorphous alumina can exhibit ductile-like deformation and fracture characteristics if processed properly, significantly expanding the applications of oxide glasses into new areas.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Olivier Bouaziz, Hyoung Seop Kim, Jungwan Lee, Yuri Estrin
Summary: This article presents a modeling approach for the Bauschinger effect, combining microstructure-based modeling with tensorial modeling in continuum mechanics. A microstructure-related model is developed and generalized to multiaxial loading, offering an advanced modeling tool for solid mechanics and physical metallurgy communities.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Wenke Wang, Jaimyun Jung, Chao Cui, Wenzhen Chen, Yang Yu, Peng Li, Wencong Zhang, Renlong Xiong, Hyoung Seop Kim
Summary: This work investigated the anisotropy variation of tensile flow stress for AZ31 magnesium alloys at different temperatures and tensile strains using the visco-plastic self-consistent model. The results showed that the anisotropy of flow stress weakened with increasing temperature and exhibited a slightly increasing stage followed by a continuously decreasing stage with increasing strain. Activation of basal slip and tension twinning contributed to the development of a (0002)//LD type texture during tension deformation, while activation of prismatic slip produced a < 10-10 >//LD type texture. The study found that the macroscopic average resolved shear stress decreased significantly with increasing temperature or strain, resulting in the decline of the tension deformation behavior anisotropy.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Metallurgy & Metallurgical Engineering
Minseok Gwak, Jun Young Park, Sang Guk Jeong, Jae Bok Seol, Hyokyung Sung, Seokhwan Kim, Hyoung Seop Kim, Jung Gi Kim
Summary: In this study, the properties of Fe-Si alloy samples processed by additive manufacturing (AM) were estimated using the response surface methodology (RSM). Quadratic polynomial models based on RSM successfully predicted the density and hardness of AM-processed Fe-4.5Si alloy samples. The optimal conditions to manufacture Fe-4.5Si samples with the highest density and hardness combination were found based on the validated mathematical models.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Jiajia Shen, Rita Goncalves, Yeon Taek Choi, J. G. Lopes, Jin Yang, N. Schell, Hyoung Seop Kim, J. P. Oliveira
Summary: This study establishes a correlation between welding process, microstructure, and mechanical properties, laying the foundations for the successful joining and application of welded joints based on high entropy alloys using low-cost arc-based welding technologies.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Hyojin Park, Nhung Thi-Cam Nguyen, Praveen Sathiyamoorthi, Sujung Son, Jongun Moon, Hyoung Seop Kim
Summary: In this study, the superplastic behavior and microstructural characteristics of the high pressure torsion-processed Al-15(CuFeMn)(85) immiscible medium-entropy alloy (IMMEA) were investigated. The multi-phase structure generated through spinodal-like decomposition in IMMEA played a key role in maintaining the ultra-fine structure and preserving an equiaxed shape during testing at high temperatures, ultimately leading to superplastic behavior. This study is the first IMMEA superplasticity study and these results contribute to a better comprehension of the phenomenon.
Article
Chemistry, Physical
Jaemin Wang, Hyeonseok Kwon, Hyoung Seop Kim, Byeong-Joo Lee
Summary: A neural network model is developed to search the vast compositional space of high entropy alloys (HEAs) and predicts their mechanical properties better than other models due to its special structure and the utilization of thermodynamics descriptors as input. A conditional random search is selected as the inverse predictor and used to design two HEAs, which are experimentally verified to have the best combination of strength and ductility. The alloy design approach could help researchers design numerous new alloys with interesting properties.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Soung Yeoul Ahn, Dong Geun Kim, Jeong Ah Lee, Eun Seong Kim, Sang Guk Jeong, Rae Eon Kim, Jungho Choe, Soon-Jik Hong, Pham Quang, Sunghak Lee, Hyoung Seop Kim
Summary: This study investigates the mechanical properties of CoCrFeMnNi high-entropy alloy (HEA) manufactured through direct energy deposition. The effect of strain rate on the mechanical properties was analyzed, and a Johnson-Cook constitutive model was employed for simulation. The results showed that the microstructural behavior of the HEA was influenced by strain localization and twin formation, which have significant implications for the design and development of HEAs under extreme environments.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Soung Yeoul Ahn, Farahnaz Haftlang, Eun Seong Kim, Sang Guk Jeong, Ji Sun Lee, Hyoung Seop Kim
Summary: Reinforcement by composite fabrication has been studied to improve the strength of high-entropy alloys (HEAs). In this study, CoCrFeMnNi+B4C high-entropy composite (HEC) parts were fabricated using the direct energy deposition process. The presence of B4C nano-particles hindered grain growth and caused elemental segregation, leading to the formation of carbide-rich regions. The B4C nano-particles also promoted the pinning effect of dislocations and provided dispersion hardening, resulting in high mechanical strength of the CoCrFeMnNi+B4C HEC.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Sang Guk Jeong, Soung Yeoul Ahn, Eun Seong Kim, Suk Hoon Kang, Sang Hun Yoo, Joo Young Ryu, Joo Hong Chun, Gangaraju Manogna Karthik, Hyoung Seop Kim
Summary: This study investigates the liquation cracking behavior of LPBF-processed Inconel718 and finds that heat treatments decrease its resistance to liquation cracking. Microstructural differences play a key role in determining the susceptibility to liquation cracking. The as-built material exhibits good resistance, providing more flexibility in high-temperature process design, while HIP treatment reduces internal defects but increases susceptibility to liquation cracking.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Jungwan Lee, Sujung Son, Seok Su Sohn, Jae Wung Bae, Hyoung Seop Kim
Summary: Hot rolling induces dynamic recrystallization and dislocation-based microbands in metastable medium-entropy alloys, leading to deformation-induced martensitic transformation at ambient temperature. This phenomenon is not identifiable in the as-annealed counterparts. As a result, the as-hot-rolled states of these alloys exhibit approximately 43% total elongation and doubled yield strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Selim Kim, Hyungu Kang, Minu Kim, Ki Jong Kim, Jae Min Lee, Hae-Won Cheong, Hyoung Seop Kim, Sunghak Lee
Summary: This study suggests that stacks of thin aluminum sheets with fine rectangular or triangular grooves are effective materials for energy absorption. The energy-absorbing performance of these materials was evaluated using a modified split Hopkinson pressure bar (SHPB). The study found that the grooves shape, groove cavity fraction, and specimen thickness affect the energy-absorbing parameters, including impact momentum and maximum impact acceleration. Both impact momentum and maximum impact acceleration showed a continuous decrease as the specimen thickness increased or as the groove cavity fraction increased. The triangular grooved specimens exhibited greater reduction in impact momentum compared to the rectangular grooved specimens. The overall energy-absorbing performance of the triangular grooved specimens was better than that of the rectangular grooved specimens. Notably, in the triangular grooved specimens with a high cavity fraction, the triangular embossing intruded into the groove cavities, resembling a 'zipper' mechanism, further enhancing the effectiveness of energy absorption. This study presents a promising approach for developing grooved aluminum sheet stacks with reduced impact momentum and maximum impact acceleration by exploring suitable groove shapes, cavity fractions, and stack thicknesses, especially in dynamically compressed artillery environments.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Farahnaz Haftlang, Alireza Zargaran, Jae Bok Seol, Jongun Moon, Peyman Asghari Rad, Eun Seong Kim, Hyoung Seop Kim
Summary: A novel maraging medium-entropy alloy was designed to achieve high tensile strength and uniform elongation at liquid nitrogen temperature by conducting a short-time martensite-to-austenite reversion treatment and adding needle-like (NiMn)(3-x)Ti-x and elliptical-shaped Ni2SiTi nano-precipitates. The alloy exhibited an ultra-high yield strength of 1.41 GPa and ultimate tensile strength of 1.88 GPa, with a uniform elongation of 14% in the reverted condition. These superior properties were attributed to the transformation-induced plasticity (TRIP)-assisted heterogeneous dual-phase microstructure strengthened by well-distributed nano-precipitates. The metastability-engineering approach can guide the design of TRIP-assisted maraging MEA to overcome the strength-ductility trade-off in extreme environments.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Rae Eon Kim, Gang Hee Gu, Yeon Taek Choi, Jeong Ah Lee, Hyoung Seop Kim
Summary: Heterostructuring is a method for achieving a combination of strength and ductility, but its usage is limited due to poor formability. In this study, a new strategy for designing heterostructures optimized for non-uniform deformation is proposed. The fabricated inverse-gradient structure of cold-rolled CoCrFeMnNi high-entropy alloy sheets exhibited superior strength-ductility synergy and excellent bendability. This is attributed to the prevention of external cracks and reduced damage evolution caused by the inverse-gradient structure. Overall, the heterostructured high-entropy alloys demonstrated superior tensile properties and formability.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Shiyu Du, Tuanwei Zhang, Zhiming Jiao, Dan Zhao, Jianjun Wang, Renlong Xiong, Hyoung Seop Kim, Zhihua Wang
Summary: A novel strategy of designing analogous harmonic structures (AHS) is implemented to enhance the strength-ductility synergy in the Co-Cr-Ni-based medium-entropy alloy (MEA). The AHS-MEA achieves high yield strength of 1028 MPa, ultimate tensile strength of 1558 MPa, and considerable uniform elongation of 20%. The study provides new insights into the nanocrystalline formation mechanism and excellent strength-ductility synergy.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Sujung Son, Jungwan Lee, Peyman Asghari-Rad, Rae Eon Kim, Hyojin Park, Jae-il Jang, Wen Chen, Yoon-Uk Heo, Hyoung Seop Kim
Summary: This study successfully synthesized a hierarchically heterogeneous microstructure by combining eutectic high-entropy alloy and medium-entropy alloy powders through powder metallurgy-based severe plastic deformation method, achieving strong hetero-deformation-induced strengthening effect. This is of great significance for the development of HEAs.
MATERIALS RESEARCH LETTERS
(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)
