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。
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.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2007年第4期294-296,共3页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(50574042)
