Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 577, Issue -, Pages 232-236Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.04.043
Keywords
Hypereutectic Al-20%Si alloy; Primary Si; Eutectic Si; In situ gamma-Al2O3
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Funding
- Natural Science Foundation of Gansu Province in China [2011GS04122]
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In the present study, the effect of in situ gamma-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 gamma-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 gamma-Al2O3 particles on Al-20%Si alloy was also discussed. (C) 2013 Elsevier B.V. All rights reserved.
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