Article
Metallurgy & Metallurgical Engineering
V. E. Bazhenov, S. S. Saidov, Yu. V. Tselovalnik, O. O. Voropaeva, I. V. Plisetskaya, A. A. Tokar, A. I. Bazlov, V. A. Bautin, A. A. Komissarov, A. V. Koltygin, V. D. Belov
Summary: The Mg-Zn-Y-Zr alloys with LPSO phase showed lower hot tearing susceptibility and higher corrosion resistance compared to alloys with W phase, while their fluidity remained similar. Increasing the Y content in the alloys resulted in increased yield strength, while other tensile properties were similar for all alloys.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Materials Science, Multidisciplinary
Daisuke Egusa, Koji Inoue, Yasuyoshi Nagai, Eiji Abe
Summary: The study found that kink boundaries (KBs) undergo reconstruction during post-annealing, forming local hexagonal close-packed Mg regions and enhancing thermal stability. The reconstruction of dislocation structures plays an important role in solute-enriched face-centered cubic layers within LPSO structures.
MATERIALS CHARACTERIZATION
(2021)
Article
Metallurgy & Metallurgical Engineering
Ziqi Wei, Shimeng Liu, Zheng Liu, Feng Wang, Pingli Mao, Xiaoxia Wang, Xingxing Li
Summary: Based on Newton baseline method of thermal analysis test, Clyne-Davies' model and 'T'-shaped hot tearing testing apparatus, the hot tearing susceptibility (HTS) of Mg-xZn-7Gd-5Y-0.5Zr alloys (x = 0, 3, 7 and 13 wt%) was investigated. The study showed that the hot tearing tendency of the alloy was highly sensitive to the Zn content. The HTS of the alloy initially decreased and then increased with increasing Zn content, with the minimum value observed at 7 wt% Zn. The decrease in T-coh(alpha) caused by the refinement of the alpha-Mg parent phase grains and the increase in secondary phase precipitation were identified as the main reasons for the decrease in HTS from 0 to 7 wt% Zn. However, the change in precipitation type of the secondary phase was the main reason for the increase in HTS at 13 wt% Zn, where the precipitation of Mg3Zn6(Gd,Y) phase resulted in a prolonged liquid-solid dual phase region and reduced grain boundary strength, leading to increased HTS of the alloy.
INTERNATIONAL JOURNAL OF METALCASTING
(2022)
Article
Chemistry, Physical
Ziqi Wei, Weipeng Mu, Shimeng Liu, Feng Wang, Le Zhou, Zhi Wang, Pingli Mao, Zheng Liu
Summary: This study investigated the effects of Gd content on the hot tearing susceptibility of g(96.94)-Zn-1-Y(2-x)-Gd-x-Zr-0.06 alloys reinforced with long-period stacking ordered (LPSO) phase. The results showed that increasing the Gd content significantly reduced the hot tearing susceptibility of the alloys. The decrease in hot tearing susceptibility at Gd content of 0.5% was attributed to the combined effects of grain refinement and increased secondary phase amount. When the Gd content increased to 1.5%, the hot tearing susceptibility continued to decrease due to the increase of pinning effect of LPSO phase and the increase of residual liquid feeding capacity caused by the increase of precipitation amount of the secondary phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Gantao Zhao, Zhirou Zhang, Yuxiu Zhang, Hailong Peng, Zhao Yang, Hiromi Nagaumi, Xuyue Yang
Summary: The effects of hot compression on the mechanical properties and creep behaviors of a Mg-Gd-Y-Zn-Zr alloy were investigated. The results showed that hot compression improved the mechanical properties at room temperature but decreased creep resistance at elevated temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Jonghyun Kim, Hongxin Liao, Xiang Ou, Zhaobin Zhang, Kaikai Kang, Taekyung Lee, Fusheng Pan
Summary: This study investigates the microstructures and mechanical properties of Mg-1Gd-1Y-xZn alloys (x = 0.2, 0.4, 0.6, and 0.8). The formation of long-period stacking-ordered (LPSO) and beta phases in the as-cast alloys is observed. The volume fraction of LPSO phase increases with higher Zn content, while that of beta phase decreases. Homogenization dissolves the beta phase into the Mg matrix but has no significant effect on the volume fraction of LPSO phases. Increasing Zn content slightly reduces grain size and enhances texture. The Mg-1Gd-1Y-0.2Zn alloy shows excellent mechanical properties at room temperature due to its high density of fine LPSO phases and reinforcement capacity. Additionally, the low volume fraction of LPSO phases in this alloy suppresses yield asymmetry.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Yuto Nakasuji, Hidetoshi Somekawa, Motohiro Yuasa, Hiroyuki Miyamoto, Michiaki Yamasaki, Yoshihito Kawamura
Summary: This study quantified the kink-band strengthening effect in a Mg-9%Y-6%Zn alloy through uniaxial hot compression. The increase in hardness due to kink-band strengthening was found to be closely related to the number of kink boundaries beneath the indentation. The estimated kink-band strengthening values from microscopic analysis were similar to those obtained from prior macroscopic analysis.
Article
Nanoscience & Nanotechnology
Hidetoshi Somekawa, Motohiro Yuasa, Daisuke Ando, Yoshikazu Todaka
Summary: The application of large strain to Mg-9at.%Y-6at.%Zn alloy leads to the formation of high density deformation kink boundaries. Shear strain is a controllable parameter for inducing kink boundaries effectively, especially in wrought-processed alloys containing the LPSO phase.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Shiyu Luan, Lei Zhang, Lijia Chen, Deqing Ma, Jinhui Wang, Peipeng Jin
Summary: The plastic deformation behavior of Mg alloy with long period stacking ordered phases (LPSO) was studied under compression at elevated temperatures. It was found that the LPSO hindered grain boundary migration, delaying dynamic recrystallization. At low deformation rates, slip and discontinuous dynamic recrystallization were the dominant deformation mechanisms, accompanied by the occurrence of kink bands. At high deformation rates, twinning was the dominant deformation mechanism, with a few recrystallized grains distributed along the twin boundaries. The dissolution of LPSO reduced the grain boundary migration resistance and promoted the nucleation of recrystallized grains.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Zhaocan Li, Guoqin Wu, Yunfang Liu, Jianmin Yu, Zhimin Zhang
Summary: The effects of hydrostatic pressure on grain refinement and deformation behaviors of Mg-13Gd-4Y-2Zn-0.5Zr alloy were investigated. It was found that the increase in hydrostatic pressure leads to an increase in equivalent stress, forming load, and stress triaxiality. However, hydrostatic pressure has little effect on dynamic recrystallization fraction and grain size, except for a slight increase in DRX fraction under higher hydrostatic pressure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Ning Su, Qianye Wu, Chenyang Ding, Yujuan Wu, Liming Peng
Summary: This study investigates the effects of Y and Gd solutes on grain refinement in Mg alloys. It is found that adding Y or increasing the Y/Gd atomic ratio can reduce the grain size, while adding Gd or decreasing the Y/Gd atomic ratio promotes grain recrystallization. The joint alloying of Y and Gd enhances the strength of the alloys. The Mg-2.5Gd-0.75Y-0.5Zn-0.4Mn alloy exhibits the optimal mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Xiaojie Zhou, Wenying Xiong, Gang Zeng, Hongchao Xiao, Jian Zhang, Xianzheng Lu, Xiaomin Chen
Summary: The combined effects of LPSO orientation and alpha-Mg texture on tensile anisotropy were investigated, with the extrusion direction showing optimal mechanical properties, the 45 degrees direction exhibiting high elongation, and the transverse direction having inferior strength and elongation simultaneously. LPSO orientation contributes to strength anisotropy through different load-bearing strengthening effects along different tensile axes, while alpha-Mg texture contributes to strength anisotropy through stronger grain boundary strengthening effects. However, LPSO orientation, rather than alpha-Mg texture, accounts for ductility anisotropy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Metallurgy & Metallurgical Engineering
Xiaoqing Fu, Shimeng Liu, Le Zhou, Zheng Liu, Ziqi Wei, Hui Guo
Summary: The microstructure of Mg-xZn-2xGd alloy affects hot tearing susceptibility, with Gd having a better effect in reducing hot tearing tendency compared to Y. As the Gd content increases, the hot tearing sensitivity of the alloy decreases.
INTERNATIONAL JOURNAL OF METALCASTING
(2021)
Article
Metallurgy & Metallurgical Engineering
Rui Guo, Xi Zhao, Bo-Wen Hu, Xue-Dong Tian, Qiang Wang, Zhi-Min Zhang
Summary: The hot compression behavior of as-homogenized Mg-9Gd-4Y-2Zn-0.5Zr alloys with different initial morphologies was studied at 450°C and a strain rate of 0.01 s(-1). The microstructure, texture evolution, and dynamic recrystallization (DRX) mechanisms were investigated under various strains. Different recrystallization mechanisms, including particle stimulated nucleation (PSN), discontinuous DRX (DDRX), and continuous DRX (CDRX), were observed during compression. Both the degree of kink and the recrystallization increased with compression, leading to a gradual weakening of the texture.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Jianqiang Hao, Jinshan Zhang, Hongxia Wang, Weili Cheng, Boqiong Li, Yang Bai
Summary: The effect of solid-solution treatment on the microstructure and mechanical properties of Mg93.5Zn2.5Y2.5Mn1Ti0.5 alloys was investigated. The results showed that solid-solution treatment transformed the fishbone-like W phase into spherical W phase and the bulk 18R LPSO phase along grain boundaries into intragranular lamellar 14H LPSO phase. The spheroidization of W phase and the formation of intragranular 14H LPSO phase effectively improved the mechanical properties of the alloys. The alloys subjected to 40 hours of solid-solution treatment exhibited the greatest improvement in mechanical properties, including yield strength, tensile strength, and elongation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Z. J. Zhou, Z. Liu, Y. Wang, P. L. Mao, W. R. Tang, Y. Zhou
MATERIALS RESEARCH EXPRESS
(2018)
Article
Materials Science, Multidisciplinary
Zijian Zhou, Zheng Liu, Yue Wang, Shimeng Liu, Wanru Tang
MATERIALS RESEARCH EXPRESS
(2019)
Article
Materials Science, Multidisciplinary
Ziqi Wei, Zheng Liu, Yue Wang, Xingxing Li
MATERIALS RESEARCH EXPRESS
(2019)
Article
Materials Science, Multidisciplinary
Ziqi Wei, Zheng Liu, Xiaofang Sheng, Yue Wang, Zhenglai Zhang, Yingdong Ju
MATERIALS SCIENCE AND TECHNOLOGY
(2019)
Article
Materials Science, Multidisciplinary
Xingxing Li, Zheng Liu, Yue Wang, Ziqi Wei, Shimeng Liu, Zhenglai Zhang, Yingdong Ju
MATERIALS RESEARCH EXPRESS
(2019)
Article
Materials Science, Multidisciplinary
Ziqi Wei, Shimeng Liu, Zheng Liu, Feng Wang, Pingli Mao, Xiaoxia Wang, Xingxing Li
