| 摘要 |
PROBLEM TO BE SOLVED: To provide rolled parts of an airplane which are formed of 7000 aluminum alloy and make high strength and excellent corrosion resistance compatible by performing aging treatment in three stages after stretching, and optimizing heat treatment conditions in each stage (in heat treatment temperature and time, and temperature raising/dropping rales). SOLUTION: A sheet-like coil of 7000 aluminum alloy is rolled by taper rolling, and subjected to the solution heat treatment. The rolled work after the solution heat treatment is subjected to the aging treatment in three stages. After the first aging treatment for 5 to 50 hours at 100 to 145°C, the temperature is not dropped in proceeding to the second aging treatment at 100 to 145°C, but raised at a rate of 50 to 150°C/hour. Then, the work is subjected to coexistent aging treatment for 0.5 to 30 hours at 140 to 195°C. The coexistent aging treatment is performed while maintaining the predetermined temperature and time. Then, the temperature is dropped at a rate of 50 to 150°C/hour to a temperature close to the temperature of the first aging treatment, and the re-aging treatment is performed for 5 to 50 hours at 100 to 145°C. COPYRIGHT: (C)2003,JPO
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