Microstructure and mechanical properties of a cast heat-resistant rare-earth magnesium alloy

被引：3
作者：
Zhu, Xiao-ping [1 ]
Yao, Jun-qing [2 ]
Wu, Hai-long [3 ,4 ]
Liu, Xin-wang [2 ]
Liu, Hua [5 ]
Fan, Zi-tian [2 ]
Lu, Shu-lin [2 ]
Wang, Kai [3 ,4 ]
Wang, Zi-dong [1 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China
[3] Dekai Intelligent Casting Co Ltd, Zhuozhou 072750, Hebei, Peoples R China
[4] China Iron & Steel Res Inst Grp, Beijing 100081, Peoples R China
[5] Guangdong Hongtu Wuhan Die Casting Co Ltd, Wuhan 430207, Peoples R China
来源：
CHINA FOUNDRY | 2023年 / 20卷 / 04期
基金：
中国国家自然科学基金;
关键词：
heat-resistant magnesium alloy; rare earth; microstructure; phase transformation; tensile property; strengthening; TG146; 22; A; TENSILE PROPERTIES; ZR ALLOY; CREEP-PROPERTIES; ZN; STRENGTH; PRECIPITATION; EVOLUTION; PHASE; ZIRCONIUM; BEHAVIOR;
D O I：
10.1007/s41230-023-2015-8
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Microstructure, mechanical properties and phase transformation of a heat-resistant rare-earth (RE) Mg-16.1Gd-3.5Nd-0.38Zn-0.26Zr-0.15Y (wt.%) alloy were investigated. The as-cast alloy is composed of equiaxed & alpha;-Mg matrix, net-shaped Mg5RE and Zr-rich phases. According to aging hardening curves and tensile properties variation, the optimized condition of solution treatment at 520 & DEG;C for 8 h and subsequent aging at 204 & DEG;C for 12 h was selected. The continuous secondary Mg5RE phase predominantly formed at grain boundaries during solidification transforms to residual discontinuous & beta;-Mg5RE phase and fine cuboid REH2 particles after heat treatment. The annealed alloy exhibits good comprehensive tensile property at 350 & DEG;C, with ultimate tensile strength of 153 MPa and elongation to fracture of 6.9%. Segregation of RE elements and eventually RE-rich precipitation at grain boundaries are responsible for the high strength at elevated temperature.
引用
收藏
页码：289 / 298
页数：10
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