| 摘要 |
PURPOSE:To provide the titled alloy having especially superior toughness and Young's modulus, by composing respective ratios of Si, Cu and Mg, further one kind or more among Ni, Cr and Mo. CONSTITUTION:The titled alloy is composed of, by weight 12.0-28.0% Si, 0.8-5.0% Cu, 0.3-3.5% Mg and one kind or more among 3.1-8.0% Ni, 0.2-8.0% Cr, 0.2-8.0% Mo. In the alloy, Si improves Young's modulus and reduces thermal expansion coefft., exhibits heat treating effect by coexistence with Mg, further provides elongation and toughness. Cu improves strength due to heat treatment effect. Mg is used for obtaining heat treating effect due to coexistence with Si and provides elongation and toughness. Ni, Cr and Mg improve high temp. strength and Young's modulus and have effect for possessing elongation and toughness. By specifying compsn. ranges of the above components, the aimed Al alloy having improved strength toughness and Young's modulus can be provided.
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