| 摘要 |
To provide an aluminum alloy forged material having excellent high temperature characteristics such as heat resistance and high temperature strength as well as excellent high temperature fatigue strength. The aluminum alloy forged material excellent in high temperature fatigue strength comprises 4.0 to 7.0 wt.% of Cu, 0.2 to 0.4 wt.% of Mg, 0.05 to 0.7 wt.% of Ag, and 0.05 to 0.15 wt.% of V, wherein a distribution density of Al-V based precipitates in structure of the forged material is 1.5 or more Al-V based precipitates/(mum)^3. The aluminum alloy forged material excellent in high temperature fatigue strength is manufactured by a method comprising the steps of homogenization heat treating an aluminum alloy casting material comprising 4.0 to 7.0 wt.% of Cu, 0.2 to 0.4 wt.% of Mg, 0.05 to 0.7 wt.% of Ag, and 0.05 to 0.15 wt.% of Vat a temperature of 500 to 535 deg.C for 15 hours or more, hot forging the homogenization heat treated aluminum alloy at a temperature of 280 to 430 deg.C, solution treating the hot forged aluminum alloy at a temperature of 510 to 545 deg.C, and quenching the solution treated aluminum alloy.
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