Effects of trace Er addition on the microstructure and mechanical properties of Mg-Zn-Zr alloy

被引：40
|
作者：
Zhang, Jing [1 ,2 ]
Ma, Qi [1 ]
Pan, Fusheng [1 ,2 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
[2] Natl Engn Res Ctr Magnesium Alloys, Chongqing 400044, Peoples R China
来源：
MATERIALS & DESIGN | 2010年 / 31卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Non-ferrous metals and alloys; Mechanical properties; Microstructure; MAGNESIUM ALLOYS; GRAIN-REFINEMENT; DEFORMATION;
D O I：
10.1016/j.matdes.2010.05.008
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of trace Er addition on the microstructure in Mg-9Zn-0.6Zr alloy during casting, homogenization, pre-heating, and hot extrusion processes were examined. The mechanical properties of alloys with and without Er were compared. The results showed that Er exhibited a lower solubility in solid magnesium and formed thermally stable Er- and Zn-bearing compounds. The Er-bearing alloy exhibited a considerably improved deformability, as well as a fine and uniform microstructure. Moreover, dynamic precipitation of fine MgZn(2) particles with a modified spherical morphology occurred during hot extrusion, resulting in a tensile yield strength of 313 MPa and a high elongation to failure value of 22%. Further aging of the Er-bearing alloy led to an increment of another 30 MPa in yield strength. In addition, Er markedly increased the thermal stability of the alloy structure. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：4043 / 4049
页数：7
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