| 摘要 |
PROBLEM TO BE SOLVED: To provide an Al alloy casting having high temperature strength, particularly having excellent strength at about 250°C without involving solution treatment.SOLUTION: First, the molten metal of an Al alloy in which the content of Mg is controlled to 3.2 to 7.2 wt.%, the content of Sc is controlled to 0.28 to 0.6 wt.%, and also both the contents of Fe and Si are controlled to 0.1 wt.% or lower is obtained. Next, the casting obtained from the molten metal is subjected to aging treatment without performing solution treatment (and hardening treatment). In this way, AlSc particles having particle diameters of 100 nm or less are precipitated at a ratio of 3 vol.% or lower in its metallic structure. |
