Microstructure and mechanical properties of as-cast and solid solution treated Mg-8Li-xAl-yZn alloys

被引：27
作者：
Liang, Xin-li [1 ]
Peng, Xiang [1 ]
Ji, Hao [1 ]
Liu, Wen-cai [1 ]
Wu, Guo-hua [1 ,2 ]
Ding, Wen-jiang [1 ,2 ]
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] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composite, Shanghai 200240, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2021年 / 31卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Mg-Li alloy; Al/Zn ratio; microstructure; mechanical properties; PHASE MG-LI; DEFORMATION-BEHAVIOR; HEAT-TREATMENT; EVOLUTION; TEMPERATURE; PLASTICITY; X=1;
D O I：
10.1016/S1003-6326(21)65550-4
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The effects of Al/Zn ratio (mass ratio) on microstructure and mechanical properties of the Mg-8Li alloy were investigated. The results indicate that in the as-cast Mg-8Li-xAl-yZn (x+y=5) alloys (LAZ alloys), when the Al/Zn ratio is 1:4 and 2:3, the secondary phases are mainly AlLi and MgLiZn phases; when the Al/Zn ratio is 3:2 and 4:1, the secondary phases are mainly AlLi and MgLi2Al phases. The decomposition temperature of MgLiZn phase is about 300 degrees C and the decomposition temperatures of AlLi phase and MgLi2Al phase are higher (similar to 350 degrees C). Solid solution strengthening is the main factor for the improvement of strength of Mg-8Li-xAl-yZn alloys. The Mg-8Li-3Al-2Zn alloy after solution treatment at 350 degrees C for 4 h has the best comprehensive mechanical properties (yield strength of 272.5 MPa, ultimate tensile strength of 315.0 MPa and elongation of 3.4%) among the studied as-cast and solid solution treated Mg-8Li-xAl-yZn alloys.
引用
收藏
页码：925 / 938
页数：14
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