Microstructure refinement of Mg-Al-Zn-Si alloys

被引：172
|
作者：
Yuan, GY [1 ]
Liu, ZL [1 ]
Wang, QD [1 ]
Ding, WJ [1 ]
机构：
[1] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200030, Peoples R China
来源：
MATERIALS LETTERS | 2002年 / 56卷 / 1-2期
基金：
中国博士后科学基金;
关键词：
Mg-Al-Zn-Si alloy; microstructure refinement; mechanical properties;
D O I：
10.1016/S0167-577X(02)00417-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Magnesium alloys containing Mg2Si particles, as a promising cheap heat-resistant magnesium alloy for automobile engine applications, are attracting more and more attention of both material scientists and design engineers. Refinement of the Chinese script Mg2Si particle is a key for using this alloy in sand casting or permanent mould casting. In the present work, the refinement effect of antimony(Sb) or calcium(Ca) on the microstructure was investigated. The study shows that Sb or Ca addition promotes the formation of fine polygonal type Mg2Si particles by providing the nucleation sites. Moreover, the grain sizes of Sb or Ca modified Mg-Al-Zn-Si alloys are much finer than that of base alloy. The effect of modification and refinement with Sb addition is more effective than that with Ca addition. Such improved microstructure of the modified alloys results in large improvement in tensile properties and toughness as compared to the base alloy. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：53 / 58
页数：6
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