| 摘要 |
PROBLEM TO BE SOLVED: To provide an Al alloy forged material having high strength and high toughness and moreover excellent in corrosion resistance and durability. SOLUTION: This aluminum alloy forged material has a composition containing, by mass, 0.6 to 1.8% Mg and 0.6 to 1.8% Si, moreover containing one or two kinds of 0.1 to 0.2% Cr and 0.1 to 0.2% Zr, in which <=0.25% Cu, <=0.05% Mn, <=0.30% Fe and hydrogen: <=0.25 cc/100 g Al are respectively regulated, and the balance Al with inevitable impurities, the average particle size of Mg2Si and Al-Fe-Si-(Mn, Cr, Zr) series crystallized and precipitated products present on the boundary of the aluminum alloy structure is regulated to <=1.2μm, and moreover, an average spacing between the crystallized and precipitated products is controlled to >=3.0μm.
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