| 摘要 |
PROBLEM TO BE SOLVED: To obtain an Al-Mg-Cu alloy plate for fabrication with a high yield strength which shows little shape distortion at quenching after a solution treatment and little spring back at fabrication due to a low initial yield strength. SOLUTION: In a solution treatment of a rolled sheet of an Al-Mg-Cu aluminum alloy containing 2.0-5.0% Mg and 0.5-1.8% Cu, the sheet is heated to 460-560°C, kept at this temperature for 0 sec to 2 hr, cooled at a cooling rate of 3-30°C/sec to a temperature range Ta of 300-410°C and subsequently cooled at a cooling rate of 80-2,000°C/sec from the temperature range Ta to a temperature range Tb of≤70°C. While cooling, a tensile stress of≥2 MPa is applied to the sheet in at least one direction parallel to the sheet surface. COPYRIGHT: (C)2003,JPO
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