Effects of Sb on the Microstructure of In-situ Mg<sub>2</sub>Si/Mg Composites

Sun Fengquan  Wang Xiaodong  Yan Youwei

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Effects of Sb on the Microstructure of In-situ Mg₂Si/Mg Composites
Issue 1, Pages: 18-20(2005)
Published： 2005 ，
DOI：

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[1]孙丰泉,王小东,严有为.Sb对原位Mg_2Si/Mg复合材料组织的影响[J].特种铸造及有色合金,2005(01):18-20+2.

Sun Fengquan Wang Xiaodong Yan Youwei. Effects of Sb on the Microstructure of In-situ Mg₂Si/Mg Composites. [J]. Special Casting & Nonferrous Alloys (1):18-20(2005)
[1]孙丰泉,王小东,严有为.Sb对原位Mg_2Si/Mg复合材料组织的影响[J].特种铸造及有色合金,2005(01):18-20+2. DOI：

Sun Fengquan Wang Xiaodong Yan Youwei. Effects of Sb on the Microstructure of In-situ Mg₂Si/Mg Composites. [J]. Special Casting & Nonferrous Alloys (1):18-20(2005) DOI：

摘要

利用Mg Si二元合金结晶的特点

在普通重力铸造的条件下

制备了原位Mg2 Si/Mg复合材料

着重研究了Sb对复合材料中Mg2 Si增强相形态的影响。结果表明

在Mg 10Si合金中

加入质量分数为 0 .8%的Sb

不仅促进了Mg2 Si的均匀形核

而且Sb偏析于Mg2 Si的界面上

阻止了Mg2 Si的进一步长大。原位Mg2 Si的形态由粗大的树枝状转变成均匀分布的颗粒状

形成了较理想的Mg2 Si颗粒增强Mg基复合材料的组织。

Abstract

In-situ Mg 2Si/Mg composites were fabricated by conventional gravity casting based on the crystallization characteristics of Mg-Si binary alloy

focusing on the effects of Sb on morphology of Mg 2Si enhancing phase in the composites. The results show that addition of 0.8% Sb into Mg-10Si alloy can not only promote homogeneous nucleation of Mg 2Si enhancing phase but also restrain the further growth of Mg 2Si enhancing phase because of the segregation of Sb at the interface. Consequently

morphology of Mg 2Si enhancing phase transformed from coarse dendrite into uniformly dispersed particulate and Mg 2Si particulate reinforced Mg matrix composites with desirable microstructure are obtained.