| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet capable of high temp. forming at high speed and excellent in high speed superplastic formability and to shorten forming time and improve prcductivity by using the aluminum alloy sheet. SOLUTION: An alloy, having a composition which consists of, by weight, 3.0-8.0% Mg, 0.001-0.1% Ti, and the balance Al with inevitable impurities and in which Fe and Si as impurities are regulated to <=0.06% and <=0.06%, respectively, is used. Moreover, the number of Al-Fe-Si compounds of >=1μm grain size is <=2000pieces/mm<2> and average crystalline grain size is 25-200μm, and further, the elongation in the case where forming is done at 350-550 deg.C at (10<-2> to 10<0> )/s strain rate is regulated to >=350%. Small amounts of Cu, Mn, and Cr can be added, and forming is performed at 350-550 deg.C at (10<-3> to 10<0> )/s strain rate. |
