Effect of Li on formation of long period stacking ordered phases and mechanical properties of Mg-Gd-Zn alloy

作     者：Li-yun Wei Jin-shan Zhang Wei Liu Chun-xiang Xu Zhi-yong You Kai-bo Nie Li-yun Wei;Jin-shan Zhang;Wei Liu;Chun-xiang Xu;Zhi-yong You;Kai-bo Nie

作者机构：College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China Shanxi Key Laboratory of Advanced Magnesium-based Materials Taiyuan 030024 China 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2016年第13卷第4期

页      面：256-261页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Nos.50571073,51574175 and 51474153) the Ph. D. Programs Foundation of Ministry of Education of China(20111402110004) the Natural Science Foundation of Shanxi Province(Nos.2009011028-3 and 2012011022-1) 

主　　题：Mg-Gd-Zn alloys Li second phase long period stacking ordered phase comprehensive properties 

摘      要：Alloys with composition of Mg_(96-x)Gd_3Zn_1Li_x(at.%)(x=0, 2, 4, and 6) were prepared by conventional casting. The microstructures of these alloys under as-cast and solid-solution conditions have been observed, and the mechanical properties were investigated. The results showed that Li is an effective element to refine the grains and break the eutectic networks in as-cast MgGd_3Zn_1 alloy. During solid solution treatment, these broken eutectic networks are spheroidized and highly dispersed. In addition, plentiful lamellar long period stacking ordered(LPSO) phases are precipitated in an α-Mg matrix when the Li addition is not more than 4%. Solid-solution treated Mg_(92)Gd_3Zn_1Li_4 alloy exhibits an optimal ultimate tensile strength(UTS) of 226 MPa and elongation of 5.8%. The strength of MgGd_3Zn_1 alloy is improved significantly, meanwhile, the toughness is apparently increased.