Article
Materials Science, Multidisciplinary
Wenjun Liu, Bin Jiang, Hongchen Xiang, Qing Ye, Shengqi Xia, Siqiang Chen, Jiangfeng Song, Yanlong Ma, Mingbo Yang
Summary: In this study, the mechanical properties of as-extruded AZ80 magnesium alloy were investigated at temperatures of 450-525℃ and strain rates of 3.0 s(-1) and 0.15 s(-1). It was found that the lower strain rate accelerated the zero ductility, and the failure mode of the alloy changed with increasing temperature.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Yangchao Deng, Wei Sun, Yang Yang, Hongyi Zhan, Kun Yan, Guang Zeng
Summary: The impacts of Mg2Sn precipitation on the age-hardening and deformation behavior of a Mg-4Sn-3Al-1Zn alloy have been studied. The alloy shows moderate hardening during ageing treatment at 175℃, with a significant increase in yield tensile strength but reduced elongation. Nanosized Mg2Sn precipitates are uniformly distributed within grains, improving tensile strength properties. Coarsened Mg2Sn precipitates and precipitate-free zones (PFZs) can be observed along grain boundaries. Tensile deformation primarily occurs in slip band array regions in grain interiors for the solution-treated alloy, and in PFZs for the as-aged alloy. The decrease in tensile ductility is caused by early intergranular microcracks initiated by coarse grain boundary Mg2Sn precipitates and PFZs. The results provide insights for developing affordable Mg alloys with a balanced combination of strength and ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Deping Zhang, Dongdong Zhang, Yaqin Zhang, Shanrong Chen, Tao Xu, Jian Meng
Summary: The ductile Mg-Yb based alloy shows better strain hardening ability and formability at room temperature compared to high-formable Mg alloys. The alloy exhibits four strain hardening stages labeled as stage I, II, III, and IV, different from the majority of Mg alloys, with stage II characterized by an increased strain hardening rate rather than plateau or decrease.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Yayun He, Ming Gao, Xi Zhao, Xianwei Ren, Yaojin Wu, Yuzhen Cheng, Beibei Dong, Shaobin Bai, Zhimin Zhang, Shengchuan Wu, Shuchang Li
Summary: This paper investigates the fatigue behavior and failure mechanisms of extruded AZ80 magnesium alloy samples with different initial structures. The results indicate that fine grain and precipitates inhibit twinning-twinning behavior to a certain extent, but promote the initiation of fatigue cracks. Studies on fatigue life and fracture mechanism reveal that both residual twins and precipitated phases can cause fatigue crack initiation, but less damage is caused by twin-induced cracks compared to second phase-induced.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Luiz Carneiro, Duke Culbertson, Qin Yu, Yanyao Jiang
Summary: The study experimentally characterized the mechanical response and microstructure evolution of a rolled AZ31B magnesium alloy using companion thin-walled tubular specimens under free-end monotonic torsion. It was found that the shear stress-shear strain response exhibits a sigmodal shape with four distinctive stages of strain hardening, involving basal slips, tension twinning, and compressing twinning. The formation of twin-twin boundaries (TTBs) and the collective hardening effects by twin boundary (TB) and TTB contribute to a unique rise in strain hardening rate in certain stages. Further observations of different types of twins and their interactions provide insights into the deformation mechanisms during different stages of the process.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Chong Yang, Guoguo Zhu, Bin Li, Yan Peng, Baodong Shi
Summary: The difference in mechanical behavior between fixed-end and free-end torsion is investigated in this study. The end constraint affects the strain hardening behavior, with fixed-end torsion dominated by prismatic slip and free-end torsion exhibiting two stages of strain hardening. The axial effect is sensitive to forward and reversal torsion, and the difference in axial stress under fixed-end torsion is attributed to twin growth.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Luiz Carneiro, Duke Culbertson, Xianyun Zhu, Qin Yu, Yanyao Jiang
Summary: Stress-strain responses and twinning characteristics were studied for a rolled AZ31B magnesium alloy under three different stress states. Tension twinning is extensively induced in twinning-favorable directions, with different twin variants activated in each stress state. The increase in hardening rate is attributed to the effect of twin boundaries and twinning texture-induced slip activities, with higher tension twin volume fractions observed under tension and compression states.
MATERIALS CHARACTERIZATION
(2021)
Article
Crystallography
Kanghe Jiang, Wei Li, Jingwei Chen, Li Ma, Wu Zeng, Junjie Yang
Summary: This study investigates the cyclic mechanical behavior and failure mechanism of the Ti-45Al-4Nb-1Mo-0.15B alloy under strain-controlled low cycle fatigue at temperatures of 400°C and 750°C. The alloy exhibits stable cyclic characteristics and the cyclic stress-strain relationship is well described by the Ramberg-Osgood equation. The fatigue lifetime at different temperatures shows a log-linear relationship with the total strain ranges. The fracture morphology suggests that the main fracture mode at 400°C is brittle, while at 750°C it is ductile. The trans-lamellar fracture dominates in the lamellar microstructure and the inter-lamellar fracture decreases with increasing strain amplitude.
Article
Materials Science, Multidisciplinary
Yinghao Feng, Lingyun Qian, Chaoyang Sun, Sinuo Xu, Nanyang Zhu, Chunhui Wang, Yang Liu
Summary: The characteristics of twins, dynamic recrystallization, and texture evolution were investigated in a solution AZ80 Mg alloy under different hot deformation conditions. The results showed that twins played a significant role in the microstructure and mechanical response, and led to specific texture evolution.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Andrew Gryguc, Seyed Behzad Behravesh, Hamid Jahed, Mary Wells, Bruce Williams, Rudy Gruber, Alex Duquette, Tom Sparrow, Jim Prsa, Xuming Su
Summary: The study successfully developed a closed die forging process for automotive suspension component using AZ80 Mg at different forging temperatures. The forged component properties were compared with other research works, and fatigue behavior was characterized for forged materials, with strain energy density proving to be the most robust method for comparison. The study provided a deeper understanding of the process-structure-properties relationship.
Article
Engineering, Mechanical
Ying Xiong, Aoxuan Zhang, Tao Zhu
Summary: In this study, the stress corrosion behavior of AZ80 magnesium alloy specimens with different orientations was investigated using SSRT testing and EIS analysis. The results showed that AZ80 magnesium alloy with different initial textures exhibited different corrosion mechanisms in simulated body fluid.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Metallurgy & Metallurgical Engineering
Dong-dong Zhang, Chu-ming Liu, Ying-chun Wan, Shu-nong Jiang, Gang Zeng
Summary: The microstructure, anisotropy in tensile strength and tensile creep resistance of the ring rolled AZ80-Ag alloy were investigated. It was found that the alloy exhibited higher strength along the rolling direction and higher creep resistance along the transverse direction. Creep mechanisms involving diffusional creep and dislocation climb were identified during the creep of the alloy.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Materials Science, Multidisciplinary
Yunpeng Zhu, Jiayu Qin, Jinhui Wang, Peipeng Jin, Peijie Li
Summary: The strain hardening behavior of AZ91 alloys fabricated by spark plasma sintering (SPS) under different sintering temperatures was investigated through compression tests at room temperature. The sintered AZ91 alloys with random texture showed high yield strength and significant strain hardening ability. The hardening abilities, including strain hardening rate, strain hardening exponent, and hardening capacity, increased with increasing sintering temperature. The strain hardening in the sintered AZ91 alloys was mainly controlled by dislocation slip and accompanied by extension twinning. The increase in hardening abilities was primarily attributed to the enhanced dislocation-induced strain hardening due to the accelerated rate of dislocation propagation caused by coarse grains. Additionally, the strain hardening induced by twinning was suppressed by fine grains and intragranular lamellar Mg17Al12 precipitates.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Qiyu Liao, Yanchao Jiang, Qichi Le, Wenxin Hu, Xiong Zhou, Dandan Li, Yinglong Li
Summary: In this study, the addition of 1.5 wt% La-rich Mish Metal (LaMM) to AZ80 magnesium alloy was investigated for its impact on microstructure evolution and texture development of the wheel hub. The results showed that LaMM greatly improved the refinement ability and deformation uniformity of AZ80 wheel hub, leading to a higher volume fraction of dynamic recrystallization (DRX) grains. The texture of the wheel hub weakened along the forming direction due to increasing strain and DRX degree. The hardness values of AZ80-LaMM wheel hub were larger and more uniform, attributed to the inhibition of grain growth by rare earth (RE) phases.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
G. S. Duan, Y. H. Chu, L. H. Song, Z. W. Guan, J. X. Zhou, R. C. Wang, X. H. Du, B. L. Wu, C. Esling
Summary: The ratcheting behavior in an extruded AZ31B magnesium alloy was investigated. Basal < a > slip, prismatic < a > slip and {10-12} extension twinning/detwinning were identified as the deformation mechanisms. The weight of the slips or twinning/detwinning affected the valley strain and ratcheting strain. The increase of slip weight resulted in a higher strain hardening rate, causing deviation from the regular ratcheting strain pattern at a stress amplitude of 105 MPa.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(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)