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Aluminum alloy board and its production manner null for cold estimate formation possible super plastic formation
Aluminum alloy board and its production manner null for cold estimate formation possible super plastic formation
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机译：铝合金板及其生产方式为冷估算成型无效可能的超塑性成型
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摘要
PURPOSE: To produce an Al alloy sheet capable of superplastic forming, at the time of working an AN-Mg alloy having a specified compsn. into a sheet material, by subjecting a rolled sheet after final cold rolling to final annealing under specified conditions. ;CONSTITUTION: At the time of subjecting the ingot of an Al alloy having a compsn. contg., by wt., 2.0 to 8.0% Mg, 0.0001 to 0.01% Be and one or two kinds among 0.3 to 2.5% Mn, 0.1 to 0.5% Cr, 0.1 to 0.5% Zr and 0.1 to 0.5% V, in which the contents of Fe and Si are respectively regulated to ≥0.2% and Na to 3ppm and Ca to 5 ppm, and the balance Al to rolling to a final sheet thickness, the final mold rolling ratio is regulated to ≥50%. Furthermore, the rolled sheet is subjected to final annealing treatment in which it is teated to the temp. range of 70 to 150°C at ≥10°C/min temp. rising rate, is held to the same temp. for 0.5 to 12 hr and is thereafter cooled at ≤10°C/min cooling rate. The Al alloy sheet for superplastic forming in which the crystalline structure is constituted of an unrecrystallized one, the 90 degree limit bend radius is regulated to 7.5 times that of the sheet thickness or below and the proof stress ratio before and after the final annealing is regulated to ≥70% can be obtd.;COPYRIGHT: (C)1995,JPO
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