Article
Materials Science, Multidisciplinary
Jinqi Pan, Wencong Zhang, Jianlei Yang, Songhui Wang, Xiaoyu Wang, Liqiang Zhan, Wenzhen Chen
Summary: In this study, the microstructural characterization and mechanical behavior of the extruded ZK61 alloy under dynamic and quasi-static loading at 623 K were investigated. It was found that an adiabatic shear band (ASB) composed of ultra-fine grains was formed under dynamic loading, while shear deformation occurred in an area with equiaxed grains under quasi-static loading. The stress-strain curve of dynamic loading showed high yield stress and long working-hardening stage, while the strain-hardening and thermal-softening in quasi-static curves reached a dynamic balance.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Zhicheng Zhu, Zhiyong Chen, Renke Wang, Chuming Liu
Summary: The mechanical behavior and microstructure characteristics of pure titanium with hat-shaped specimens under quasi-static and dynamic loading were investigated and compared. The study found that dynamic specimens exhibited higher yield stress and peak stress compared to quasi-static specimens. Microstructure characterization revealed different localized deformation mechanisms in the two types of specimens, with quasi-static specimens showing a wide shear localization region mainly composed of elongated twin structures, while dynamic specimens exhibited an ASB region consisting of ultrafine equiaxed grains resulting from rotational dynamic recrystallization. The study also observed different types of primary twins and multiple generations of twins in both types of specimens. The microhardness of the shear localization region in quasi-static specimens and the ASB region in dynamic specimens were found to be higher due to strain hardening and ultrafine-grained strengthening, respectively. Microtexture analysis revealed different orientation relationships between grains and local shear planes in the two types of specimens.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
S. M. Fatemi, Y. Moradipour, R. Chulist, H. Paul
Summary: Shear punch deformation was used to investigate the shear deformation behavior and microstructural evolution of a Mg-Y-Nd-Zr alloy at various temperatures. It was found that metastable phases may precipitate dynamically during deformation, and flow softening behavior was observed at different temperatures. The deformation mode promoted extension twinning, and twinning was observed even at high temperatures. Dynamic recrystallization occurred at 450 and 500 degrees C, with progressive lattice rotation as the mechanism. Shear flow stress was successfully modeled using constitutive equations. The rate-controlling mechanisms were determined to be dislocation glide controlled by rare earth diffusion at 25-400 degrees C and grain boundary sliding controlled by lattice diffusion at 450-500 degrees C.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Changxing Cui, Feng Wang, Yanchao Li, Benqi Jiao, Li Huang, Wen Zhang, Lian Zhou
Summary: In this paper, uniaxial thermal compression tests were conducted on beta-quenched Zr-4 alloy at 1023 K, with engineering strains ranging from 0.05 to 0.3. The microstructure evolution, deformation mode, and dynamic recrystallization (DRX) mechanism were systematically investigated using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) techniques. The results showed that prismatic slip dominated the plastic deformation in the strain scopes of 0.05-0.2, while basal slip coupled with tensile twins occurred in some residual undeformed grains when the strain reached 0.3. Evidence suggested the coexistence of discontinuous dynamic recrystallization (DDRX), continuous dynamic recrystallization (CDRX), and DRX associated with twins during the thermal compression. Distinctions were observed in the protruding nucleation mechanism of DDRX, where dislocations migrated and accumulated at the adjacent boundary instead of passing through it.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Kun Jiang, Jianguo Li, Xiukai Kan, Feng Zhao, Bing Hou, Qiuming Wei, Tao Suo
Summary: In this study, the dynamic mechanical behavior of a face-centered cubic (FCC) high/medium entropy alloy (HEA) was investigated through split Hopkinson pressure bar (SHPB) experiments. Electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) were used to examine the microstructure of the specimens. The results showed that the alloy exhibited strong strain hardening capacity, strain rate sensitivity, and temperature dependence. The compressive failure at 77 K was caused by crack propagation within adiabatic shear bands (ASBs), which were formed due to dynamic recrystallization (DRX) of the material. The severe local shear flow, adiabatic temperature rise, and fast quenching within the ASBs resulted in ultrafine grains.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Chemistry, Physical
Weiying Huang, Jianhua Chen, Ruizhi Zhang, Xuyue Yang, Liping Jiang, Zhenyu Xiao, Yaqun Liu
Summary: Uniaxial compression experiments were conducted on AZ31 magnesium alloy at different temperatures and strain rates to investigate deformation modes and dynamic recrystallization behavior. A unified constitutive equation was established for different initial textures, and activation energies for different samples were determined. The role of prismatic slips and kink bands in the recrystallization process was discussed for the first time, leading to improvements in strength and ductility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Wencong Zhang, Jinqi Pan, Songhui Wang, Jianlei Yang
Summary: This study investigates the microstructure evolution of the extruded Mg-6.03Zn-0.55Zr alloy during hot plane strain compression experiments. It is found that basal slip is the main deformation mechanism, while higher temperatures lead to the activation of non-basal slip, weakening the basal texture.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Jinqi Pan, Jianlei Yang, Wencong Zhang, Huan Li, Wenzhen Chen, Guorong Cui
Summary: In this study, hot shear-compression deformation of in situ TiBw/Ti6Al4V composites was conducted, revealing shear as the dominant deformation mechanism and observing dynamic recrystallization in shear bands, leading to a decrease in flow stress. The presence of TiBw promoted the process of dynamic recrystallization.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Zhi Jia, Pengfei Zhang, Huifang Wang, Jinjin Ji, Tong Wang, Yanjiang Wang, Xuming Wang
Summary: This study investigates the thermal deformation characteristics and dynamic recrystallization mechanisms of Incoloy 800H alloy through thermal compression tests. The results show that the proportion of dynamic recrystallization significantly improves with increasing deformation, and both continuous and discontinuous mechanisms are observed. Twins promote grain boundary bulging and have a significant effect on dynamic recrystallization.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
H. Mohammadi, A. R. Eivani, S. H. Seyedein, M. Ghosh, H. R. Jafarian
Summary: Isothermal compression tests were conducted on Zn-22Al alloy under different temperature and strain rate conditions. The results showed that all flow stress curves exhibited softening behavior after reaching peak stress due to dynamic recrystallization and dynamic recovery. Various parameters relating to deformation conditions were determined. A kinetic model for dynamic recrystallization was constructed and validated. The simulation results using DEFORM-3D finite element software confirmed the non-uniform distribution of effective strain and dynamic recrystallization, consistent with the experimental results.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Xinlei Pan, Xuede Wang, Zeng Tian, Weifeng He, Xiaosong Shi, Peiming Chen, Liucheng Zhou
Summary: This paper systematically investigated the DRX mechanism and its effects on grain refinement in Ti6Al4V titanium alloy subjected to LSP using EBSD and TEM characterization. The results showed that the DRX mechanism induced by shear bands played a vital role in texture transition and grain refinement during LSP.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Xinjie Zhu, Qunbo Fan, Duoduo Wang, Haichao Gong, Yu Gao, Jingjiu Yuan, Kai Chen, Feng Qian
Summary: The study on the microstructure evolution near adiabatic shear bands (ASBs) in titanium alloys has made significant progress, but the underlying mechanism is still not clear. This study conducted dynamic compression tests on a specific titanium alloy and carefully investigated its microstructures using advanced microscopy techniques. The results revealed a new dynamic recrystallization mechanism in the central region of ASBs, shedding light on the understanding of ASB evolution. Additionally, the study found that the presence of twins in certain regions was influenced by severe deformation and the instability of certain phases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Umer Masood Chaudry, Min-Su Lee, Tea-Sung Jun
Summary: This study systematically investigated the twin-induced dynamic recrystallization of commercially pure titanium under cryogenic and room temperature. The results showed that higher strain levels resulted in the increased evolution of twins and interactions between twins at room temperature, while cryogenic temperature led to significant grain refinement.
MATERIALS CHARACTERIZATION
(2023)
Article
Engineering, Civil
Trunal Bhujangrao, Fernando Veiga, Catherine Froustey, Sandra Guerard, Edurne Iriondo, Philippe Darnis, Franck Girot Mata
Summary: This study investigates the shear deformation characteristics of the AA7075 aluminum alloy under high strain conditions. Finite Element simulation is used to choose the appropriate specimen geometry, and experimental tests are conducted to observe the softening mechanism and uniformity of shear deformation.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Weixin Yu, Yue Li, Junhui Cao, Zhijun Yang, Jinyong Zhang, Shaoting Lang
Summary: Dynamic impact tests were conducted on near alpha TA23 titanium alloy, showing that deformation temperature significantly affects flow stress. The modified J-C model demonstrates higher accuracy in predicting the dynamic impact deformation behavior of TA23 alloy compared to the original model.
MATERIALS TODAY COMMUNICATIONS
(2021)
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)