Effect of Y content on microstructure and mechanical properties of as-cast Mg-8Li-3Al-2Zn alloy with duplex structure

被引：81

作者：

Zhao, Jiong

Zhang, Jie

Liu, Wencai ^{[1
]}

Wu, Guohua

Zhang, Liang

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 650卷

基金：

高等学校博士学科点专项科研基金; 中国国家自然科学基金;

关键词：

Mg-Li alloy; Duplex structure; As-cast; Yttrium; Microstructure; Mechanical properties; TENSILE PROPERTIES; EVOLUTION; ND;

D O I：

10.1016/j.msea.2015.10.067

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this study, effect of Y on microstructure and mechanical properties of as-cast Mg-8Li-3Al-2Zn alloy was investigated. The results show that microstructure of the Mg-8Li-3Al-2Zn alloy mainly consists of alpha-Mg, beta-Li, AlLi and MgLiAl2 phases. With addition of Y, the Al2Y compound forms and increases gradually, the AlLi phase decreases and the beta-Li phase increases, meanwhile, the microstructure is significantly refined and equiaxed. The addition of 1 wt% Y produces the smallest grain size. Mg-8Li-3Al-2Zn-0.5Y alloy exhibits an optimum combination of tensile properties with the ultimate tensile strength, yield strength and elongation of 153.0 MPa, 218.5 MPa and 16.9%, which are improved by about 6.4%, 13.2% and 13.4% compared with those of Mg-8Li-3Al-2Zn alloy (143.8 MPa, 193.0 MPa and 14.9%), respectively. The mechanisms of improvement are related to grain refinement and second phase strengthening. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：240 / 247

页数：8

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