| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high strength Al-Cu-Mg alloy extruded material in which the formation of a coarse recrystallized structure is suppressed even if solution treatment is performed, and which can obtain high strength. Ž<P>SOLUTION: The extruded material of an aluminum alloy has a composition containing 3.0 to 6.0% Cu, 0.3 to 2.5% Mg and 0.2 to 1.0% Mn, wherein, as impurities, the content of Si is regulated to ≤1.0%, Fe to ≤1.0%, Cr to ≤0.20%, Zn to ≤0.25% and Ti to ≤0.20%, and the balance Al with inevitable impurities, and has a mixed structure where the surface of the extruded material includes a recrystallized structure, and the inside thereof includes a fibrous structure, wherein the maximum value of the thickness of the recrystallized structure in the surface is ≤4/1 of the minimum thickness of the extruded material. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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