| 摘要 |
PURPOSE:To produce an Al alloy forged material excellent in strength and toughness by subjecting the extruded material of an Al alloy having a specified compsn. to hot forging under specified temp. conditions at a specified draft. CONSTITUTION:The ingot of an Al alloy having a compsn. contg., by weight, 0.6 to 1.4% Si, 0.8 to 1.2% Mg, 0.4 to 1.2% Cu, 0.15 to 0.30% Mn, 0.1 to 0.2% Zr, 0.1 to 0.3% Fe and <0.05% Cr or that obtd. by executing heating and the subsequent homogenizing treatment to the same ingot is made into an extruded material and is subjected to hot forging in the temp. range of 300 to 400 deg.C at >=30% draft, by which the Al alloy forged material excellent in both strength and toughness and suitable as the material for automotive parts can be produced.
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