Article
Materials Science, Multidisciplinary
Yuguang Li, Feng Guo, Yiwei Wang, Huisheng Cai, Liang Liu
Summary: The existing forms of rare earth elements and their solid solution amount in ZK-RE(Ce, Y, Gd) alloy were studied quantitatively using low-temperature phase separation technology. The results showed that the solid solution amount of rare earth elements mainly depends on their addition amount, and the ability to form solid solutions differs among Gd, Y, and Ce. Rare earth elements are mostly distributed in Mg-Zn-RE compounds, and increasing the rare earth content facilitates the formation of more Mg-Zn-RE compounds. The solid solution ability of rare earth elements follows the order of Gd > Y > Ce, and the amount of solid solution directly affects the initial element content of compound precipitation in the remaining melt. The Zn/Ce ratio in the residual melt of ZK-Ce alloy and the Zn/Y(Gd) ratio in the residual melt of ZK-RE(Y, Gd) alloy determine the type and number of rare earth compounds.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Chemistry, Physical
Feng Guo, Liqiang Fang, Xueping Zhao, Yuguang Li, Huisheng Cai
Summary: The solid solution and compounds in Mg-Zn-Gd-Zr magnesium alloy semicontinuous casting ingots were effectively separated by phase separation technique. It was found that increasing the Zn/Gd ratio in the as-cast alloys increases the ratio of I and W phases, while increasing the content of Zn and Gd under a certain Zn/Gd ratio increases the amount of I and W phases simultaneously.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Huizi Chen, Jian Wang, Xiangchen Meng, Yuming Xie, Yulong Li, Long Wan, Yongxian Huang
Summary: Utilizing friction stir processing, an ultrafine-grained structure was achieved in Mg-Zn-Y-Zr alloy leading to extraordinary superplasticity. Grain refinement and homogeneous dispersion of precipitates were promoted by the coupled thermo-mechanical effect, resulting in an ultra-fined grains size of 1.9 +/- 0.4 μm and a superplastic elongation of 642%. Grain boundary sliding was considered as the predominant superplastic deformation mechanism in ultrafine-grained materials.
Article
Chemistry, Physical
Ming Li, Xu Wang, Yu Liu, Zhengbing Xiao, Yuanchun Huang
Summary: The heterogeneous bimodal microstructure and its formation mechanism of Mg-Gd-Y-Zn-Zr alloy during iso-thermal compression at 450 degrees C and 0.001 s-1 were investigated. The alloy exhibited bimodal grain size distribution and bimodal texture distribution during uniaxial isothermal compression. Particle-stimulated nucleation (PSN) and continuous dynamic recrystallization (CDRX) were identified as the main grain refinement mechanisms. Inhomogeneous plastic deformation, DRX, and grain boundary pinning effect were determined to be the necessary conditions for the formation of the bimodal microstructure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Metallurgy & Metallurgical Engineering
V. E. Bazhenov, A. Koltygin, M. C. Sung, S. H. Park, Yu Tselovalnik, A. A. Stepashkin, A. A. Rizhsky, M. Belov, V. D. Belov, K. Malyutin
Summary: Magnesium alloys are commonly used in aircraft for their lightweight properties. In this study, high-potential Mg-Zn-Y-Zr alloys were selected and tested for their performance, with the Mg-4 wt% Zn-3 wt% Y-0.3 wt% Zr alloy showing high thermal conductivity and satisfactory mechanical properties. The alloy demonstrated a room temperature thermal conductivity of 105 W/mK and an increase in elongation can be achieved through heat treatment.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
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
Materials Science, Multidisciplinary
Zeru Wu, Jianmin Yu, Ziwei Zhang, Hongbing Hu, Zhimin Zhang
Summary: The static recrystallization behavior of a deformed Mg-13.14Gd-3.86Y-2.0Zn-0.39Zr alloy after different annealing treatments was investigated. The degree of recrystallization increased with higher annealing temperatures. The main mechanism for recrystallized grains formation was the transformation of low-angle grain boundaries into high-angle grain boundaries. The annealing treatment also resulted in a decrease in dislocation density and average grain size. Furthermore, the precipitation behavior of the Mg5(Gd,Y) phase changed from grain boundaries to inside the grains. The annealing treatment consumed the LPSO phases and caused a decrease in the basal texture strength of the alloy.
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
Zhibing Ding, Xuanle Zhi, Bin Liu, Hua Hou, Shuai Zhang, Wenmin Guo, Dongrui Chen, Yuhong Zhao
Summary: The effect of Sn addition on the microstructure and mechanical properties of Mg-12Gd-3Y-0.5Zn-0.6Zr alloys was investigated. The addition of Sn increased the number and high temperature stability of Sn3RE5 phases, resulting in an increased elastic modulus of the alloys. It also significantly increased the number of fine circular beta' phases in peak-aged alloys. Suitable addition of Sn endowed the Mg-12Gd-3Y-0.5Zn-0.6Zr-1Sn alloy with excellent comprehensive performance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Yuguang Li, Feng Guo, Jing Li, Huisheng Cai
Summary: The quantitative study of rare-earth compounds in Mg-Zn-Gd-Zr alloy was conducted using phase separation technique. The effects of rare-earth elements on compound formation during solidification were analyzed, and the effects of W phase and its content on dynamic recrystallization were investigated. The increase of Gd content effectively increased the content of W phase in the casting alloy, while the formation of W phase depended on the Zn/Gd ratio in the residual melt. Increasing the Zn/Gd ratio or increasing Gd content alone promoted W phase formation. The newborn W phase originated from the decomposition of the I phase after homogenization, but its amount was smaller. According to process hardening theory, the critical strain of dynamic recrystallization nucleation decreased with the increase of W phase. W phase also promoted the formation of recrystallized grains, leading to an increased area ratio of recrystallized grains.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Review
Materials Science, Multidisciplinary
Xue Yang, Zhimin Zhang, Mu Meng, Jingjing Jia, Honglei Zhang, Genxing Lei, Jianmin Yu
Summary: This study investigated the hot deformation behavior of Mg-9Gd-4Y-2Zn-0.5Zr alloy through hot tensile tests conducted at different temperatures and strain rates. The relationship between peak stress, fracture strain, fracture morphology, and soften behavior was discussed, and a fracture damage model was proposed to predict fracture failure. The results showed that the decrease in Z value resulted in more obvious soften behavior and transformation of fracture morphology. The proposed fracture damage model was in good agreement with the experimental results.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Cong Dang, Xiaoxu Dou, Jingfeng Wang, Di Yu, Jinxing Wang, Ruopeng Lu, Hua Hou, Yuhong Zhao
Summary: Different solution treatments at different temperatures were conducted on the Mg-9.55Gd-2.27Y-1.28Zn-0.55Zr-0.11Nd alloy, resulting in different phase constitutions. The Mg3RE-type eutectic phases transformed into long period stacking order (LPSO) phases with various morphologies after solution treatment. Increasing the solution temperature led to larger grain size, more lamellar LPSO phases, and segregation of Zr element. The special spatial structure consisting of prismatic b' precipitates, basal g' precipitates, and lamellar LPSO phases hindered dislocation movement effectively, leading to high strength, but also caused premature cracking and decreased ductility.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(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
Materials Science, Multidisciplinary
Yao Li, Guofu Xu, Shichao Liu, Baofeng Wang, Xiaoyan Peng
Summary: In this study, the anisotropy of the Al-Zn-Mg-Sc-Zr alloy sheet in the peak-aged state was analyzed, showing that grain orientation and Schmid factor significantly affect the alloy properties. Samples at 0 degrees and 90 degrees have higher strength but lower elongation due to wider distribution of Schmid factors, while samples at 45 degrees and 60 degrees have lower strength but higher elongation due to narrower distribution of Schmid factors.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Guangang Wang, Guangsheng Huang, Ke Liu, Junlei Zhang, Bin Jiang, Aitao Tang, Fusheng Pan
Summary: The study investigated the different deformation behaviors of magnesium alloys under different stress states. It was found that magnesium alloys with weaker texture distribution did not necessarily exhibit better plasticity and formability, possibly due to enhanced grain boundary cohesion with increased zinc content. Additionally, the work hardening behavior of the alloys varied depending on the load direction.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Yuguang Li, Feng Guo, Yiwei Wang, Huisheng Cai, Liang Liu
Summary: The existing forms of rare earth elements and their solid solution amount in ZK-RE(Ce, Y, Gd) alloy were studied quantitatively using low-temperature phase separation technology. The results showed that the solid solution amount of rare earth elements mainly depends on their addition amount, and the ability to form solid solutions differs among Gd, Y, and Ce. Rare earth elements are mostly distributed in Mg-Zn-RE compounds, and increasing the rare earth content facilitates the formation of more Mg-Zn-RE compounds. The solid solution ability of rare earth elements follows the order of Gd > Y > Ce, and the amount of solid solution directly affects the initial element content of compound precipitation in the remaining melt. The Zn/Ce ratio in the residual melt of ZK-Ce alloy and the Zn/Y(Gd) ratio in the residual melt of ZK-RE(Y, Gd) alloy determine the type and number of rare earth compounds.
MATERIALS RESEARCH EXPRESS
(2022)
