Powder forging method of aluminum alloy powder of high proof stress and toughness

摘要

Either aluminum alloy powder or a green compact thereof is prepared wherein: (1) the composition formula is Aℓ100-a-bFeaXb where a and b in atomic % are 4.0 ≦ a ≦ 6.0, 1.0 ≦ b ≦ 4.0, where X is at least one type of alloy element selected from Y and Mm (mish metal); or (2) the composition formula is Aℓ100-a-b-cFeaSibXc, where a, b and c in atomic % are 3.0 ≦ a ≦ 6.0, 0.5 ≦ b ≦ 3.0, and 0.5 ≦ c ≦ 3.0, where X is at least one type of alloy element selected from Ti, Co, Ni, Mn and Cr, and both (1) and (2) include an amorphous phase of at least 1% by volume. At least either the aluminum alloy powder or the green compact thereof is heated at an increasing temperature rate of at least 80°C/min. to a predetermined temperature of at least 560°C and not more than a temperature at which a liquid phase is contained 10% by volume. At least the aluminum alloy powder or the green compact thereof is powder forged at the predetermined temperature. As a result, an aluminum alloy superior in static strength and dynamic strength can be produced.