Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 29    No. 6    June 2019

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Microstructure and mechanical properties of as-cast Mg-8Li-xZn-yGd (x=1, 2, 3, 4; y=1, 2) alloys
Si-jie OUYANG1,2, Wen-cai LIU1,2, Guo-hua WU1,2, Hao JI1,2, Zhan-kui GAO1,2, Xiang PENG1,2, Zhong-quan LI3,4, Wen-jiang DING1,2

1. National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Shanghai Innovation Institute for Materials, Shanghai 200444, China;
3. Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China;
4. Shanghai Engineering Technology Research Center of Near-Net-Shape Forming for Metallic Materials, Shanghai 201600, China

Abstract:The as-cast Mg-8Li-xZn-yGd (x=1, 2, 3, 4; y=1, 2; wt.%) alloys were prepared in a vacuum induction furnace and their microstructure and mechanical properties were investigated. The results show that the increase of Zn content results in the volume fraction of W-phase (Mg3Zn3Gd2) increasing while that of Mg3Gd phase decreasing. The strength of Mg-8Li-xZn-1Gd alloys is improved with the increase of Zn content, which is ascribed to the second phase strengthening of fine strip-like W-phase and the solid solution strengthening of Zn element. For Mg-8Li-4Zn-yGd alloys, the increase of Gd content leads to the appearance of coarse and discontinuous net-like W-phase, which decreases the strength. The Mg-8Li-4Zn-1Gd alloy exhibits an optimum comprehensive performance with the yield strength, ultimate tensile strength and elongation of 154.7 MPa, 197.0 MPa and 12.4%, respectively. In addition, the aging behavior of the typical alloys was also investigated.

 

Key words: Mg-Li-Zn-Gd alloy; W-phase; microstructure; mechanical properties; aging behavior

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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