Effect of Nd and Y addition on microstructure and mechanical properties of as-cast Mg-Zn-Zr alloy

被引：150

作者：

Li, Qiang ^{[1
]}

Wang, Qudong ^{[1
]}

Wang, Yingxin ^{[1
]}

Zeng, Xiaoqin ^{[1
]}

Ding, Wenjiang ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Natl Engn Res Ctr Light Alloys Net Forming, Shanghai 200030, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2007年 / 427卷 / 1-2期

关键词：

magnesium alloy; microstructure; Zn2Zr3; Mg4Zn7; T phase; W phase;

D O I：

10.1016/j.jallcom.2006.02.054

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Direct chill cast Mg-Zn-Zr alloys with different amount of Nd and Y additions have been investigated in this study. The interdendritic phases of as-cast Mg-5Zn-0.6Zr alloy were comprised of a small amount of Zn2Zr3 and Mg4Zn7. They were changed by the addition of Nd to T phase or T phase coexisting with W phase, and the additions of Nd and Y to W phase, occurring with a refinement of dendritic size, an increase of interdendritic phase amount and an improvement in the thermal stability of interdendritic phases. There was a strong dependence of tensile properties on microstructure. The continuous networks of intergranular phases in Mg-Zn-Nd-Zr alloys significantly deteriorated the ultimate strength and elongation, whereas the less continuity of intergranular phases in the Mg-Zn-Nd-Y-Zr alloys favored the ultimate strength and elongation. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：115 / 123

页数：9

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