Article
Materials Science, Multidisciplinary
Yuxiu Zhang, Zhirou Zhang, Qinghuan Huo, Chunyu Wang, Jinlong Yang, Xuyue Yang
Summary: This study investigated the creep behaviors of Mg-Y alloys with high Y concentration, revealing the creep mechanisms of as-solution and as-aged samples at different temperatures. It also explored the influences of static precipitation and precipitate-free zones on the creep resistance.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Chunxiang Chen, Qinghuan Huo, Zhirou Zhang, Yuxiu Zhang, Jiao Tang, Kaiyu Li, Jijun Ma, Xuyue Yang
Summary: In heat-resistant Mg-Gd based alloys, the presence of static precipitated beta ' phases and directly formed PFZs were found to enhance the creep resistance of the alloy. The dominant creep mechanisms, including twinning and cross-slip, were also identified as key factors contributing to the improved creep resistance of the alloy. The study highlights the importance of precipitate origin and PFZ development in understanding and improving the creep properties of Mg-Gd based alloys at medium to high temperatures.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Hui Shi, Yuanding Huang, Lixiang Yang, Chunquan Liu, Hajo Dieringa, Chong Lu, Lv Xiao, Regine Willumeit-Roemer, Norbert Hort
Summary: This study investigates the compressive creep behavior of Mg-12Gd-0.4Zr alloys at 250 degrees C. The presence of beta' and beta'(F) precipitate chains in Mg-Gd-Zr alloys forms a honeycomb-like structure, improving the creep resistance. However, the creep performance of the sand-cast alloy is weakened by the occurrence of weakly strengthening beta(1) precipitates. On the other hand, the creep resistance of the peak-aged alloy is enhanced by the formation of precipitate-free zones and the arrested cross-slip of basal and pyramidal dislocations.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Satoshi Araki, Koji Oishi, Yoshihiro Terada
Summary: The study shows that the α-Mg/C14-Mg2Ca eutectic alloy's creep strength is affected by the α/C14 interface, which acts as a barrier to dislocation gliding within the α-Mg lamellae but does not help rearrange dislocations.
Article
Chemistry, Applied
Bibo Li, Kui Zhang, Guoliang Shi, Kaikun Wang, Yongjun Li, Xinggang Li, Minglong Ma, Jiawei Yuan
Summary: This research systematically studied the microstructure evolution, mechanical properties, and creep mechanisms of Mg-12Gd-1MM-0.6Zr alloy. The T5 treated alloy exhibited significantly higher tensile and yield strength but lower elongation compared to the as-extruded sample, while the as-extruded alloy showed the best creep resistance among all conditions tested.
JOURNAL OF RARE EARTHS
(2021)
Article
Nanoscience & Nanotechnology
Tao Chen, Sijia Hu, Shiqi Li, Qinghuan Huo
Summary: In this study, the creep behaviors of solution-treated pure Mg and AZ-series alloys (including AZ31, AZ61, and AZ91) along the rolling direction at 453 K were systematically investigated. It was found that the creep resistance did not monotonically improve with increasing Al contents, and the optimal creep resistance was achieved in AZ61 sample. The reasons for the changes in creep properties between AZ61 and AZ91 samples were explained in detail.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
He Qin, Guangyu Yang, Tong Bai, Shuxia Ouyang, Wanqi Jie
Summary: The study reveals that the tensile creep behavior of Mg-10Gd-0.4Zr alloy is influenced by the faster transformation of the initial beta' phase to beta(1) phase and wider precipitate-free zones under high stress conditions, leading to a decrease in creep resistance of the alloy.
Article
Nanoscience & Nanotechnology
Yuxiu Zhang, Dongliang Chen, Hiromi Nagaumi, Xuyue Yang
Summary: In this study, conventional forging was used to significantly improve the creep resistance of a Mg-0.9Mn-0.5Ce alloy, resulting in a mixed microstructure with both coarse and fine grains. The improved creep resistance was mainly attributed to the introduction of strong dislocation entanglements, tough twin boundaries, and precipitates, as well as the decreased mobility of dislocations and grain boundaries due to dynamically precipitated Mg12Ce precipitates and Ce element segregation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Zhao Yang, Taiki Nakata, Chao Xu, Gang Wang, Lin Geng, Shigeharu Kamado
Summary: A high-performance Mg-8Gd-4Y-0.5Mn-0.2Sc alloy was fabricated using homogenization, hot extrusion, and ageing. The microstructure evolution during homogenization was studied, and an optimum time of 18 h was determined to minimize the volume fraction of second phase particles and maintain a fine grain structure. The alloy exhibited excellent age-hardening ability and strength after peak-aged treatment, with a tensile yield stress of 441 MPa and an ultimate tensile strength of 506 MPa. The high yield strength was attributed to the co-existing bimodal microstructure, fine dynamically recrystallized grains, dense precipitated particles, and nano-scale precipitates. Precipitation strengthening was revealed as the dominant strengthening mechanism.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Jianhua Chen, Weiying Huang, Bing Liu, Hiromi Nagaumi, Xuyue Yang
Summary: In this study, the creep behaviors of dilute Mg-Mn-Zn alloys with bimodal and homogeneous grain microstructures were investigated. The samples exhibited different types of dislocation slip and creep mechanisms depending on the direction of loading. The bimodal grain microstructure accelerated creep and resulted in inferior creep resistance compared to the homogeneous microstructure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Dongliang Chen, Yuxiu Zhang, Zhirou Zhang, Hiromi Nagaumi, Huashan Liu, Xuyue Yang
Summary: The three-dimensional tensile creep anisotropy of a hot-rolled Mg-0.9Mn-1.5Ce alloy sheet was investigated, and the results showed a strong dependence of creep behavior on the loading direction. Different creep mechanisms were observed in different loading directions, leading to variations in creep resistance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
D. Ebenezer, S. R. Koteswara Rao, K. L. Harikrishna, G. Madhusudhan Reddy
Summary: The creep behavior of friction stir welded joints made on ZE41 magnesium alloy plates was studied using impression tests. The localized creep behavior varied in different zones of the joint, and the weak zone shifted with changing temperature and stress. The creep exponent and activation energy were obtained using power law and threshold stress approaches. The dominant mechanism of creep in the ZE41 FS weld joint was proposed to involve dislocation climb and cross-slip, but it could not be conclusively determined.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Zhirou Zhang, Qinghuan Huo, Yuxiu Zhang, Zhenyu Xiao, Aki Hashimoto, Xuyue Yang
Summary: The study investigated the effects of artificial aging on the tensile creep resistance of a hot-rolled Mg-3.5 wt%Nd alloy. It found that the type of precipitates and solute depletion in grain boundaries changed with aging duration, leading to grain boundary migration and PFZ widening, which decreased creep resistance. The sample with narrow PFZs and dislocations cutting beta' phases showed the best creep resistance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Jiaxiang Li, Qinghuan Huo, Chunyu Wang, Yuxiu Zhang, Zhirou Zhang, Gang Feng, Xuyue Yang
Summary: The results of the study demonstrated a clear tension-compression asymmetry in the creep behavior of the alloy under tensile and compressive creep loading along the rolling direction and the normal direction. Twinning played a role in deteriorating the creep resistance of certain samples and causing asymmetrical behavior in the results. The T-RD sample showed the best creep resistance, while the C-ND sample followed, with the C-RD and T-ND samples showing similarly poor creep resistance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Yue Wang, Kejian Li, Zhipeng Cai, Li Shi, Haitao Wang
Summary: The microstructure evolution of IN617 during creep is influenced by factors such as dislocation configuration, grain boundary weakening, nitrogen diffusion, and precipitate coarsening.
MATERIALS CHARACTERIZATION
(2022)
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)