| 摘要 |
PURPOSE:To manufacture a superplastic Al alloy having a microcrystalline structure by subjecting an Al-Mg alloy ingot having a specified composition to homogenization, hot working, holding under heating, cooling and cold working in order under specified conditions. CONSTITUTION:An ingot consisting of, by weight, 2-7% Mg, one or more a among 0.05-1.5% Mn, 0.05-0.5% Cr, 0.05-0.5% Zr, 0.05-0.5% V and <=0.15% Ti, and the balance Al with impurities is homogenized at 400-550 deg.C, hot worked at 300-550 deg.C, held under heating at 350-550 deg.C, cooled at >=100 deg.C/hr cooling rate, and cold worked at >=30%. |
