Abstract
This study is focused on the effect of Al2Ca as a modifier on eutectic Si modification of A356 alloy. Microstructural observation was carried out for as-cast, as-solution treated and as-aged samples. Solution treatment and aging were performed for 2, 4, 6 and 10 hrs at 540oC and 170oC, respectively. Although A356 alloy, which Al2Ca was added, has no significant difference in as-cast phases with normal A356 alloys, it shows much more modified eutectic Si, grain refinement and improved tensile property both in as-cast and as-heat treated conditions. TGA result shows that Al2Ca added A356 alloy has a certain improvement in oxidation resistance.
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