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The Effects of Sc on the Microstructure of Hypoeutectic Al-Si Alloys  

Kim, Myung-Han (Department of Materials Engineering, Cheongbuk National University)
Lee, Jong-Tae (Department of Materials Engineering, Cheongbuk National University)
Publication Information
Journal of Korea Foundry Society / v.24, no.3, 2004 , pp. 145-152 More about this Journal
Abstract
The eutectic Si in Al-8.5wt.%Si alloy was changed from large flake to fine lemellar(or fibrous) shape when the Sc amount in the Al-Si alloy reaches 0.2wt.%. The optimum amount of Sc for the best modification effect was 0.8wt.% and slight decrease of modification effect occurred over this value. The study on the distribution of the modifiers(Sr, Na, and Sc) and the measurement of the surface tension of the Al-8.5wt.%Si alloy melt added with Sr, Na, and Sc modifier, respectively, reveals that Sc modifies the eutectic Si by the decrease of surface tension, while Sr and Na modify the eutectic Si mainly by impurity induced twinning mechanism.
Keywords
Hypoeutectic Al-Si; Sc; Modification; Surface tension; Impurity induced twinning;
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