CPC C22C 21/02 (2013.01) [B22D 17/02 (2013.01); B22D 21/007 (2013.01)] | 4 Claims |
1. An aluminum casting comprising:
an aluminum alloy including Si in an amount of 9.6-12.0 wt %, Cu in an amount of 1.5-3.5 wt %, Mg in an amount of 0.1-0.3 wt %, Zn in an amount of 0.5-1 wt %, Fe in an amount of 1-1.3 wt %, Mn in an amount of 0.1-0.5 wt %, Ti in an amount of 0.02-0.3 wt %, B in an amount of 0.01-0.04 wt %, Sr in an amount of 0.01-0.03 wt %, a remainder Al, and unavoidable impurities,
wherein the aluminum casting has a microstructure including primary crystal alpha-aluminum and a eutectic structure,
wherein a percentage of the number of grains each having an area of 5-100 μm2 in the microstructure is greater than or equal to 85% of the number of grains observed in the entire microstructure, and
wherein the eutectic structure is formed of eutectic silicon and is a mixture of particulate structure and fibrous structure, the mixture including at least 5% particulate structure exhibiting a ratio of longest to shortest part of 3 or less.
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