Review
Chemistry, Physical
D. Sopu
Summary: The complex nature of shear banding and the disordered structure of metallic glasses pose challenges in understanding the mechanisms of strain localization and shear band formation. The percolation of shear transformation zones (STZs) is widely accepted as the atomic-scale mechanism for shear banding. This review provides an up-to-date assessment of the STZ-Vortex mechanism and its applications in understanding shear band dynamics and deformation mechanisms in metallic glasses. It also highlights unresolved issues where the STZ-Vortex model could be effectively applied.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Fu Xu, Yizhou Liu, Botao Dai, Yanhuai Ding, Celal Kursun, Meng Gao
Summary: In this study, an in-situ tensile platform coupled with a nanoindenter was used to investigate the continuous loading and creep behaviors of Cu50Zr50 metallic glass film under different pre-tensile strains. The volume, activation volume, and relaxation time spectrum of shear transformation zones were determined based on models. The results showed that all three factors increase with pre-tensile strain.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Yuexin Chu, Guishen Zhou, Shaoshan Wan, Yue Zhang, Fuyu Dong, Xiaoguang Yuan, Binbin Wang, Liangshun Luo, Yanqing Su, Weidong Li, Peter K. Liaw
Summary: The relationship between shear transformation zones (STZs) and serrated flow dynamics in metallic glasses (MGs) was analyzed using nanoindentation. Different plasticity MGs were studied, and two distinct types of serrated flow dynamics were identified. MGs with easily activated STZs or low loading rates exhibited a power-law distribution, indicating a self-organized critical state. In contrast, hard MGs or high loading rates showed a Gaussian distribution, indicating a chaotic state with reduced stresses required for plastic deformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Siqi Liu, Zexin Chang, Yuequn Fu, Yuyu Liu, Meichao Lin, Xiaobo Ren, Wenxian Wang, Zhiliang Zhang, Jianying He
Summary: This study investigates the nanoscale creep behavior and creep size effect of a selective laser melted Zr-based metallic glass. The results show that the creep resistance decreases with increasing applied peak loads, and a potential mechanism for this creep size effect is proposed.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Physical
J. W. Lv, F. L. Wang, D. W. Yin, S. Zhang, Z. Q. Cai, Z. L. Shi, M. Z. Ma, X. Y. Zhang
Summary: This study investigated the effects of deep cryogenic cycle treatment (DCT) on the microstructure and mechanical behaviors of Ti33Zr30Cu9Ni5.5Be22.5 bulk metallic glass (BMG). The results showed that DCT increased relaxation enthalpy, room-temperature plasticity, and compressive plasticity. The enhancement of plasticity was attributed to the increase in shear transformation zone (STZ) volumes and decrease in shear band formation energy induced by DCT.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Zhi Qiang Ren, Yu Wei Liu, Ying Liu, Jing Tao Wang
Summary: In this paper, a theoretical formulation for shear transformation zone (STZ) volume, shear band density, and plasticity is presented. The temperature dependence of these parameters is discussed. The experimental data of plasticity for Vit105 bulk metallic glass show negative temperature dependence, which is consistent with the prediction of the analytical formulation.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
Yuexin Chu, Guishen Zhou, Yue Zhang, Fuyu Dong, Xiaoguang Yuan, Binbin Wang, Liangshun Luo, Yanqing Su, Weidong Li, Peter K. Liaw
Summary: This study investigates the heterogeneity of Shear Transformation Zones (STZs) in Zr-based metallic glasses (MGs) using different nanoindentation methods. The results show that the calculated volume of STZs varies depending on the method used, and is influenced by the Poisson's ratio and loading rate.
Article
Nanoscience & Nanotechnology
Ziyun Long, Pingjun Tao, Liwei Kong, Guotai Wang, Shengkai Huang, Shenghua Wen, Huajie He, Zhenghua Huang, Xuguang Zhu, Xi Xu, Huanhuan Deng, Yuanzheng Yang
Summary: This article investigates the effects of cryogenic thermal cycling on the microstructure and plasticity of Zr60Cu20Al10Ni10 bulk metallic glass. The heterogeneity of the internal structure of the cryogenic thermal cycling-treated samples increases the energy state and introduces more flow defects, resulting in an improved room-temperature plasticity of Zr-based BMGs. This phenomenon indicates a more frequent generation of shear transition zones and shear band movement within them.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Ceramics
Nandita Ghodki, Maryam Sadeghilaridjani, Sundeep Mukherjee
Summary: Limited understanding of time-dependent plastic deformation behavior of amorphous alloys as a function of their structural state is explored in this study. Creep behavior of Zr52.5Ti5Cu17.9Ni14.6Al10 bulk metallic glass was investigated using nanoindentation technique, revealing that creep displacement increased with increasing load and temperature, and creep strain rate sensitivity increased with increase in temperature and decrease in applied load. The study suggests that diffusion-based deformation dominates at higher temperature, while shear transformation mediated plasticity is prevalent at room temperature.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Nanoscience & Nanotechnology
Abhilash Gunti, Jayanta Das
Summary: This study reports the effect of testing conditions on the nanomechanical behavior of the surface and inner core of as-cast plates of various bulk metallic glasses. The presence of solid-liquid like regions in the glassy structure affects the deformation mechanism, leading to the formation of shear bands. The rate sensitivity and deformation mechanism are influenced by the size and dynamics of shear transformation zones.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Devashish Rajpoot, R. Lakshmi Narayan, Long Zhang, Punit Kumar, Haifeng Zhang, Parag Tandaiya, Upadrasta Ramamurty
Summary: Fracture behavior of bulk metallic glass matrix composites with both transforming and non-transforming fi-Ti dendrites under shear and opening modes was examined, showing lower fracture toughness in mode II due to shear dominant stress state and considerable crack growth in this mode. Despite the ability of transforming dendrites to strain harden and enhance ductility, BMGCs reinforced with non-transforming dendrites exhibit higher toughness in both modes. Shear band patterns suggest identical fracture mechanism in BMGCs and BMGs, with differences rationalized by the effect of relaxation enthalpy and dendrites length scale.
Article
Materials Science, Multidisciplinary
W. H. Zhou, F. H. Duan, Y. H. Meng, C. C. Zheng, H. M. Chen, A. G. Huang, Y. X. Wang, Y. Li
Summary: The study systematically investigated the evolution of microstructure and mechanical properties of Zr-based bulk metallic glasses with varying oxygen content. Results showed that with increasing oxygen content, compressive plasticity decreased slightly before plunging drastically, revealing a threshold oxygen content level for ductile-brittle transition at 3500 at. ppm. The embrittlement at high oxygen content was closely related to changes in microstructure.
Article
Engineering, Mechanical
K. Tao, J. C. Qiao, Q. F. He, K. K. Song, Y. Yang
Summary: Microstructural heterogeneity in metallic glasses plays a crucial role in influencing their mechanical and physical properties. Researchers have found that severe plastic deformation can enhance the spatial structural heterogeneity and reduce the energy barrier for shear transformation zones (STZs) activation. The study suggests that decreasing barriers and increasing nucleation sites of STZs during physical aging to rejuvenation may improve the plasticity in metallic glasses.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Chemistry, Physical
Shristy Jha, Saideep Muskeri, Siva Shankar Alla, Sundeep Mukherjee
Summary: Bulk Metallic Glasses (BMGs) have limited bulk plasticity due to shear localization. The effect of structural state and stress state on the micro-scale deformation behavior of BMGs is not well understood. In this study, a model Ni-based BMG was investigated under multiaxial nano-indentation, uniaxial micro-pillar compression, and micro-cantilever beam bending. The relaxed BMG showed increased hardness, yield strength, and bending strength compared to its as-cast counterpart. Both the as-cast and relaxed samples exhibited stable notch opening and blunting during micro-cantilever bending tests, but notch weakening was observed for both structural states. This research may stimulate further investigations into the deformation behavior of BMGs in real-world structural applications at small scale.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Multidisciplinary
LangTing Zhang, YaJuan Duan, Daniel Crespo, Eloi Pineda, YunJiang Wang, Jean-Marc Pelletier, JiChao Qiao
Summary: Dynamic mechanical relaxation is a fundamental tool for understanding the mechanical and physical properties of viscoelastic materials like glasses. The high-entropy bulk metallic glass exhibits a distinct beta-relaxation feature. Anelastic strain is contributed by the stochastic activation of shear transformation zones (STZs), and interactions between STZs induce viscous-plastic strain under certain conditions.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Materials Science, Multidisciplinary
Baoxian Su, Binbin Wang, Liangshun Luo, Liang Wang, Yanqing Su, Yanjin Xu, Binqiang Li, Ting Li, Haiguang Huang, Jingjie Guo, Hengzhi Fu, Yu Zou
Summary: In this study, the corrosion behavior of a wrought Ti-6Al-3Nb-2Zr-1Mo (Ti80) alloy in artificial seawater with different F- concentrations and pH values was systematically investigated. The results showed that increasing the F- concentration and reducing the pH value deteriorated the corrosion performance of the Ti80 alloy. The F- concentration mainly affected the anodic process, while the increase in pH played a significant role in inhibiting both cathodic and anodic processes. Surface characterizations revealed the preferential dissolution of the equiaxed alpha phase compared to the intergranular beta phase.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Yong Yang, Binbin Wang, Yanjie Li, Baoxian Su, Liangshun Luo, Liang Wang, Haiguang Huang, Yanqing Su, Jingjie Guo
Summary: The addition of carbon significantly improves the corrosion resistance and mechanical properties of TA10 alloys, with increasing carbon content leading to optimization of corrosion rate and breakdown potential.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Zhiwen Li, Liang Wang, Chen Liu, Junbo Zhao, Binbin Wang, Zhe Li, Liangshun Luo, Ruirun Chen, Yanqing Su, Jingjie Guo
Summary: A Co-free non-equiatomic Ni2FeCr medium-entropy alloy was developed and studied for the Hall-Petch strengthening effect caused by grain boundaries and annealing twin boundaries. The alloy was prepared through cold rolling and recrystallization processes. It was found that the Ni2CrFe alloy forms a stable face-centered cubic solid solution. Tensile tests revealed that the alloy has a resistance to softening at high temperatures and the formation of dislocation pile-ups at annealing twin boundaries.
Article
Materials Science, Multidisciplinary
Min Wu, Jing Tao, Jihao Wang, Wei Jiang, Yueming Sun, Dingping Dong, Yu Zhao, Mengmeng Wang, Tong Liu, Liangshun Luo, Yanqing Su
Summary: In this paper, the effects of TB2 additions on the microstructure and mechanical properties of SLM-fabricated TiB2/Al-Mg-Sc alloys were studied. It was found that the addition of TiB2 increased the molten pool width, decreased the molten pool depth, and resulted in a fine-grained microstructure. The TiB2 additions also improved the tensile strength and elongation of the alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Botao Jiang, Liang Wang, Hui Yan, Jiliang Teng, Binbin Wang, Liangshun Luo, Ruirun Chen, Yanqing Su, Jingjie Guo, Hengzhi Fu
Summary: TiB and TiC reinforced Ti-6Al-4V matrix composites were prepared using melt hydrogenation, with a total fraction of reinforcements at 5 vol % and a ratio of TiB to TiC at 1:1. The study investigated the effects of melt hydrogenation on the solidification process, phase composition, and microstructure of the titanium matrix, and observed the morphology and distribution of reinforcements with and without hydrogen. Nano-hardness measurements were also carried out. The results showed that melt hydrogenation can alter the solidification process, increase the b phase, and refine the lamellar structure. Hydrogen resulted in larger reinforcements that aggregated at the grain boundary, forming a network structure. Nano-hardness was slightly reduced by hydrogen for both the titanium alloy and the reinforcements. In summary, melt hydrogenation can maintain or slightly reduce the strength of the composites at room temperature and decrease the nano-hardness.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Composites
Botao Jiang, Liang Wang, Hui Yan, Guoqiang Zhu, Jiliang Teng, Binbin Wang, Liangshun Luo, Ruirun Chen, Yanqing Su, Jingjie Guo
Summary: This study investigates the effect of melt hydrogenation on the interface between reinforcements and matrix. A novel method called melt hydrogenation is used to directly incorporate trace hydrogen atoms into composites, which optimizes the interface bonding strength and improves load transfer efficiency. The thickness of the transition layer at the interface becomes thinner as the hydrogen content increases, and when the hydrogen content reaches a certain level, the atomic arrangement at the interface becomes orderly and strictly coherent.
COMPOSITES COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Liang Wang, Botao Jiang, Xuan Wang, Ruirun Chen, Yingmei Tan, Liangshun Luo, Yanqing Su, Jingjie Guo
Summary: An advanced melt hydrogenation method was used to improve the poor hot workability of titanium matrix composites (TMCs). The (TiB+TiC)/Ti-6Al-4 V composites were fabricated by directly melting alloys in a gas mixture of H2 and Ar. The results showed that melt hydrogenation increased the length of TiB whiskers and aggravated the clustering of reinforcements, thereby improving the hot workability of TMCs in (' + beta) phase region. The formation of more dynamic recrystallization (DRX) grains and enhanced mobility of dislocations contributed to the improved hot workability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Yuexin Chu, Guishen Zhou, Shaoshan Wan, Yue Zhang, Fuyu Dong, Xiaoguang Yuan, Binbin Wang, Liangshun Luo, Yanqing Su, Weidong Li, Peter K. Liaw
Summary: The relationship between shear transformation zones (STZs) and serrated flow dynamics in metallic glasses (MGs) was analyzed using nanoindentation. Different plasticity MGs were studied, and two distinct types of serrated flow dynamics were identified. MGs with easily activated STZs or low loading rates exhibited a power-law distribution, indicating a self-organized critical state. In contrast, hard MGs or high loading rates showed a Gaussian distribution, indicating a chaotic state with reduced stresses required for plastic deformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Hui Yan, Liang Wang, Xiaoming Wang, Botao Jiang, Hongcan Liu, Binbin Wang, Liangshun Luo, Yanqing Su, Jingjie Guo, Hengzhi Fu
Summary: In this study, Ti-6Al-4V matrix composites reinforced with TiB ceramic whiskers were synthesized and hydrogenated using the melt hydrogenation technique. The effects of hydrogenation on the microstructure evolution and hot compression behavior of the composites were investigated. The results showed that hydrogenation significantly improved the hot workability of the composites and promoted the dispersion of TiB whiskers.
Article
Engineering, Multidisciplinary
Botao Jiang, Liang Wang, Jiaxin Du, Hui Yan, Guoqiang Zhu, Beibei Xu, Baoxian Su, Binbin Wang, Chen Liu, Liangshun Luo, Ruirun Chen, Yanqing Su, Jingjie Guo
Summary: This study summarizes the strengthening mechanism of hydrogen microalloying for titanium matrix composites, which involves the direct integration of trace hydrogen atoms into composites using a unique technique called melt hydrogenation. The results demonstrate that melt hydrogenation refines the microstructure of the matrix, promotes the distribution of reinforcements, and improves the interfacial adhesion work, leading to the simultaneous improvement of room temperature strength and plasticity.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Zhe Li, Chen Liu, Liang Wang, Zhiwen Li, Qingda Zhang, Binbin Wang, Baoxian Su, Liangshun Luo, Ruirun Chen, Yanqing Su, Jingjie Guo
Summary: In this study, a newly named NbSi-containing refractory high-entropy alloy (RHEA) is proposed using the Nb-Si based alloy insight. The dependence of cooling rates on phase transformation and the deformation mechanism at different temperatures were investigated. The results showed that an appropriate Si content could lead to excellent strength-plasticity synergy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Guoqiang Zhu, Yichen Wang, Liang Wang, Binbin Wang, Ran Cui, Binqiang Li, Baoxian Su, Chen Liu, Ruirun Chen, Liangshun Luo, Yanqing Su, Jingjie Guo
Summary: The Ti-6.5Al-2Zr-Mo-V (TA15) alloy with gradient characteristics fabricated via electron beam freeform fabrication (EBF3) technology exhibits different mechanical properties due to its gradient microstructure. The top region of the TA15 deposit has the best comprehensive properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Guoqiang Zhu, Liang Wang, Binbin Wang, Binqiang Li, Junbo Zhao, Bao Ding, Ran Cui, Botao Jiang, Chunzhi Zhao, Baoxian Su, Liangshun Luo, Ruirun Chen, Yanqing Su, Jingjie Guo
Summary: The electron beam freeform fabrication (EBF3) technique is used to prepare a titanium/steel multi-material system. The addition of copper as an interlayer improves the interface strength and suppresses the formation of intermetallic compounds. The Ti64/Cu interface exhibits high micro-hardness and shear strength due to the synergy between the copper-rich solid solution and interdendritic Cu-Ti intermetallic compounds.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Review
Materials Science, Multidisciplinary
Zhaobo Li, Liangshun Luo, Binbin Wang, Baoxian Su, Lei Luo, Liang Wang, Yanqing Su, Jingjie Guo, Hengzhi Fu
Summary: The cooperative effects of Mo and B additions on the microstructure, fracture toughness, and high-temperature compressive strength of Nb-Si-Ti based alloys were investigated. It was found that the additions of Mo and B did not affect the constituent phases of the alloys. Individually alloying with Mo or B decreased the fracture toughness, while the cooperative additions increased the fracture toughness. Additionally, the individual or cooperative additions of Mo and B significantly enhanced the high-temperature compressive strength. The 1Mo-2B alloy exhibited the highest room temperature fracture toughness and maintained the high-temperature compressive strength.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Yanan Wang, Binbin Wang, Liangshun Luo, Binqiang Li, Baoxian Su, Dayong Chen, Tong Liu, Liang Wang, Yanqing Su, Jingjie Guo, Hengzhi Fu
Summary: By properly selecting the process atmosphere, the researchers were able to control the crystallographic texture of laser powder bed fusion (LPBF) manufactured FeCrAl parts. They discovered that different process atmospheres resulted in different microstructures and texture formation mechanisms.
SCRIPTA MATERIALIA
(2024)
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)