| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy casting having excellent tensile strength and fatigue strength and suitably used e.g. as a cylinder head for internal-combustion engines and its manufacturing method and further to provide a cylinder head for internal-combustion engines made of the aluminum alloy casting and a cylinder head for internal-combustion engines obtained using the manufacturing method. SOLUTION: In the aluminum alloy casting which has a composition consisting of, by mass, 4.0 to 10.0%, preferably 4.0 to 7.0%, Si, 2.0 to 4.5% Cu,≤0.5%, preferably 0.25 to 0.45%, Mg, 35 to 200 ppm, preferably >50 to 200 ppm Sr and the balance Al with inevitable impurities, Fe content is reduced to≤0.25% and the amount of porosity is set to≤0.3% by area ratio. COPYRIGHT: (C)2007,JPO&INPIT
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