| 摘要 |
A cast aluminum alloy and tooling fixture fabricated therefrom is provided which can be produced in thicknesses up to 32.0 inches; and which has equiaxed grains, an ultimate tensile strength above 30,000 psi after annealing, is dimensionally stable, and is free from porosity. The alloy has a nominal composition of 3.0% copper, 2.2% zinc, 0.7% nickel, 1.0% magnesium, 1.2% iron, 0.3% manganese, and balance aluminum. The alloy is direct water chill cast followed by a stress relieving anneal.
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