| 摘要 |
The invention relates to a cylinder head and motor block casting made of Si 6.80 - 7.20, Fe 0.35 - 0.45, Cu 0.30 - 0.40, Mn 0.25 - 0.30, Mg 0.35 - 0.45, Ni 0.45 - 0.55 Zn 0.10 - 0.15, Ti 0.11 - 0.15, remainder aluminium and phases of the types aluminium-nickel, aluminium-copper, aluminium-manganese, aluminium-iron as well as mixed phases. For manufacturing an aluminium alloy is filled into a casting mould at a temperature of 720.degre e. to 740.degree.C, then the aluminium alloy is subjected to cooling at a cooling rate of 0.1 to 10 K s-1, after the cooling to room temperature a thermal treatment is carried out under the following conditions: solution heat treatment at 530.degree.C for 5 hours, a chilling in water at 80.degree.C and an artifical ageing at a temperature of 160 to 200.degree.C for 6 hours.
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