| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy material to be formed at a high temperature and a high speed, which can provide a formed article having superior strength and fatigue characteristics after having been formed, and further has superior formability at the high temperature and the high speed; and to provide a manufacturing method therefor. SOLUTION: The aluminum alloy material to be formed at the high temperature and the high speed comprises 2.0-8.0% Mg, 0.05-1.5% Mn, 0.05-0.4% Cr, 0.4% or less Fe, 0.4% or less Si, and the balance Al; includes Cr-based intermetallic compounds with sizes of 20μm or smaller, which are formed in a melting and casting step; includes intermetallic compound particles in an amount of 350,000 pieces per square meter, which are Mn- and Cr-based precipitates and have sizes of 50 to 1,000 nm; and is formed at 200 to 550°C and a strain ratio of 10<SP>-2</SP>to 10/second, and immediately is cooled to room temperature at 20°C/minute or higher. COPYRIGHT: (C)2007,JPO&INPIT
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