Si及变质处理对Mg<sub>2</sub>Si/Mg复合材料的影响

李元元; 田文峰; 胡侨丹; 严有为

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Si及变质处理对Mg₂Si/Mg复合材料的影响
Effects of Si Content and Modification on Microstructure and Properties of In-situ Mg₂Si/Mg Composites
2007年第4期页码：294-296
纸质出版日期： 2007 ，
DOI：

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[1]李元元,田文峰,胡侨丹,严有为.Si及变质处理对Mg_2Si/Mg复合材料的影响[J].特种铸造及有色合金,2007(04):294-296+244.

Li Yuanyuan, Tian Wenfeng, Hu Qiaodan, et al. Effects of Si Content and Modification on Microstructure and Properties of In-situ Mg₂Si/Mg Composites[J]. Special Casting & Nonferrous Alloys, 2007,(4):294-296.
[1]李元元,田文峰,胡侨丹,严有为.Si及变质处理对Mg_2Si/Mg复合材料的影响[J].特种铸造及有色合金,2007(04):294-296+244. DOI：

Li Yuanyuan, Tian Wenfeng, Hu Qiaodan, et al. Effects of Si Content and Modification on Microstructure and Properties of In-situ Mg₂Si/Mg Composites[J]. Special Casting & Nonferrous Alloys, 2007,(4):294-296. DOI：

摘要

分析了Mg-Si二元合金直接原位形成Mg2Si/Mg复合材料的过程

研究了Si含量以及变质处理对复合材料组织和性能的影响。试验结果表明

随着合金中Si含量的增加

合金的流动性降低

复合材料中原位Mg2Si的数量增多

树枝晶形态更为发达;对优化的Mg-8Si合金

进行混合稀土（MM）和Sb变质处理

可明显改善Mg2Si的形态和分布

但Sb变质的效果要好于MM。合金经质量分数为1.2%的Sb变质处理后

Mg2Si以颗粒状均匀分布在Mg基体中

从而使复合材料具有较好的耐磨性。

Abstract

Effects of Si content and modification on microstructure and properties of in-situ Mg2Si/Mg composites prepared with Mg-Si binary alloy have been investigated. The results reveal that with increasing the Si content

the fluidity of Mg-Si alloy is decreased

resulting in the increase of in-situ Mg2Si particles in the composites and the generation of more developed dendrite

such as Chinese script. Although the modification of optimized Mg-8Si alloy with MM（mistchmetal） and Sb respectively all can improve the distribution and shape of Mg2Si particle

the modification effect with Sb is obviously superior to that with MM. With addition of 1.2% Sb

the Mg2Si particle can be transformed from the Chinese script to uniformly dispersed particles in the composites

greatly improving the wear resistance of the composites.