Effect of heat treatment on microstructures and mechanical properties of high vacuum die casting Mg-8Gd-3Y-0.4Zr magnesium alloy

被引：25
作者：
Wang, Zhi-qin [1 ]
Zhang, Bin [1 ]
Li, De-jiang [1 ]
Fritzsch, Robert [2 ]
Zeng, Xiao-qin [1 ,3 ]
Roven, Hans J. [2 ,4 ]
Ding, Wen-jiang [1 ,3 ]
机构：
[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[2] Norwegian Univ Sci & Technol, Dept Mat Sci & Engn, N-7491 Trondheim, Norway
[3] Shanghai Jiao Tong Univ, Key State Lab Met Matrix Composite, Shanghai 200240, Peoples R China
[4] Qatar Univ, Ctr Adv Mat, Doha, Qatar
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2014年 / 24卷 / 12期
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
Mg-8Gd-3Y-0.4Zr alloy; heat treatment; microstructure; mechanical property; fracture behavior; MG-GD ALLOYS; FATIGUE; PRECIPITATION; BEHAVIOR; DEFORMATION; ZN;
D O I：
10.1016/S1003-6326(14)63530-5
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The microstructure, the content of compounds, mechanical properties and fracture behavior of high vacuum die casting Mg-8Gd-3Y-0.4Zr alloy (mass fraction, %) under T4 condition and T6 condition were investigated. The microstructure for the as-cast Mg-8Gd-3Y-0.4Zr alloy mainly consists of alpha-Mg and eutectic Mg-24(Gd,Y)(5) compound. After solution treatment, the eutectic compounds dissolve massively into the Mg matrix. The main composition of solution-treated alloys is supersaturated alpha-Mg and cuboid-shaped phase. The T4 heat treated samples have increasing cuboidal particles with the increase of heat treatment temperature, which turn out good mechanical properties. The optimum T4 heat treatment for high vacuum die cast Mg-8Gd-3Y-0.4Zr alloy is 475 degrees C, 2 h according to microstructure results. The optimum ultimate strength and elongation of solution-treated Mg-8Gd-3Y-0.4Zr alloy are 222.1 MPa and 15.4%, respectively. The tensile fracture mode of the as-cast, and T6 heat treated alloys is transgranular quasi-cleavage fracture.
引用
收藏
页码：3762 / 3768
页数：7
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