| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-strength and high-toughness Al alloy forged material suitable for the parts of a transport such as automotive suspension parts or the like. SOLUTION: This aluminum alloy forged material has a compsn. contg., by mass, 0.6 to 1.6% Mg, 0.6 to 1.8% Si and 0.05 to 1.0% Cu, furthermore, in which the content of Fe is controlled to <=0.30, contg. one or >= two kinds among 0.15 to 0.6% Mn, 0.1 to 0.2% Cr and 0.1 to 0.2% Zr, moreover, in which the content of hydrogen is controlled to <=0.25 cc/100 g Al, and the balance Al with inevitable impurities. In this case, the aluminum alloy ingot cast at 530 to 600 deg.C is subjected to homogenizing heat treatment at 530 to 600 deg.C and is thereafter subjected to hot forging to form into a forged material, and the total area ratio of Mg2Si (2 in Fig.) and Al-Fe-Si-(Mn, Cr, Zr) crystallized products (3 in Fig.) in the aluminum alloy structure in the forged material is controlled to <=1.5% per unit area.
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