Aluminum alloy casting excellent in high temperature strength and thermal conductivity, process for producing the same, aluminum alloy piston for internal combustion engine

摘要

An aluminum alloy casting excellent in high temperature strength and thermal conductivity, a method for producing the aluminum alloy casting, and an aluminum alloy piston for an internal combustion engine using the casting. Si: 12.0 to 13.5 mass% Cu: 4.5-5.5 mass% Mg: 0.6 to 1.0 mass% Ni: 0.7 to 1.3 mass% Fe: 1.15 to 1.25 mass% Ti: 0.10 to 0.2 mass% P: 0.004 to 0.02 mass%, The balance being Al and inevitable impurities,An aluminum alloy casting in which the major axis length of the Al-Fe-Si type crystallized material in the observation visual field of 0.2 mm 2 is 100 m or less in terms of the average length of ten crystals from the larger one. Aluminum alloy piston for internal combustion engine consisting of this. A method for producing an aluminum alloy casting in which a molten aluminum alloy having the above chemical composition is cast at a cooling rate of 100 C./s or more and then subjected to aging treatment.