Effects of Ag Addition on the Microstructure and Elevated Temperature Mechanical Properties of as-cast Mg-6Gd-2Y-Nd-xAg-0.4Zn-0.5Zr Alloys

被引：0
作者：
Tao Ma
Sicong Zhao
Liping Wang
Erjun Guo
Yicheng Feng
Lili Zhao
Rui Fan
Jingfang Li
机构：
[1] Harbin University of Science and Technology,School of Material Science and Chemical Engineering
[2] Harbin University of Science and Technology,Key Laboratory of Advanced Manufacturing and Intelligent Technology (MOE)
[3] Heilongjiang University,Key Laboratory of Functional Inorganic Material Chemistry (MOE), School of Chemistry and Materials Science
来源：
International Journal of Metalcasting | 2023年 / 17卷
关键词：
Mg-RE-Ag alloy; elevated temperature mechanical properties; microstructure; grain refinement;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In order to broaden applications of magnesium rare earth alloys in aerospace fields, the microstructure and mechanical properties of as-cast Mg-6Gd-2Y-Nd-0.4Zn-0.5Zr alloys can be improved by Ag alloying, and the elevated temperature strengthening mechanism is revealed. The microstructure analysis shows that the as-cast alloys mainly consist of α-Mg equiaxed grain and network-like β-Mg5(Gd,Y,Nd,Ag,Zn) phase. The addition of the Ag exhibits a strong grain refinement effect and promotes the formation of the second phase in the as-cast alloys. It is noteworthy that the content of Ag exceeds 1.5 wt%, and a small amount of Mg17Ag2(Gd,Y,Nd,Zn) phase is formed at grain boundaries. The results of tensile test reveal that the as-cast Mg-6Gd-2Y-Nd-1.5Ag-0.4Zn-0.4Zr alloy has excellent mechanical properties. Compared with the Mg-6Gd-2Y-Nd-0.4Zn-0.4Zr alloy, the ultimate tensile strength is 220 MPa at 25 °C and 225 MPa at 250 °C, which are improved by 15.7 and 11.3%, respectively.
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页码：170 / 181
页数：11
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