Effect of in situ ¦Ã-Al2O3 particles on the microstructure of hypereutectic Al-20 % Si alloy
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- 作者：Qinglin Li ; Ti ; ong Xia ; Yefeng Lan ; Wenjun Zhao ; Lu Fan ; Pengfei Li
- 关键词：Hypereutectic Al&ndash ; 20 % Si alloy ; Primary Si ; Eutectic Si ; In situ ¦Ã-Al2O3
- 刊名：Journal of Alloys and Compounds
- 出版年：2013
- 出版时间：15 November, 2013
- 年：2013
- 卷：577
- 期：Complete
- 页码：232-236
- 全文大小：4052 K
文摘
In the present study, the effect of in situ ¦Ã-Al2O3 particles on the morphology and size of the primary and eutectic Si phases in hypereutectic Al-20 % Si alloy has been investigated. Microstructural analyses demonstrates that in situ ¦Ã-Al2O3 particles significantly refined primary Si crystals from coarse polygonal and star-like shape to fine blocky shape with smooth edges and corners. The eutectic Si structure was modified from the coarse acicular structure to fine flake-like morphology that is intermediate between acicular and coral-like fibrous structure. In addition, the modification mechanism of in situ ¦Ã-Al2O3 particles on Al-20 % Si alloy was also discussed.