Trans.Nonferrous Met.Soc.China
Vol.11  No.2             (Sum 40)            Apr.2001

［Article ID］ 1003-6326(2001)02-0235-04

Effect of scandium on superplasticity of Al-Mg alloys

XIAO Yun-zhen(孝云祯)1, GAO Cai-ru(高彩茹)1,
MA Hong-sheng(马宏声)1, TIAN Shi-ping(田士平)2
(1. College of Metal Forming, Material and Metallurgy,
Northeastern University, Shenyang 110006, P.R.China;
2. The Capital Iron and Steel Company, Beijing 100083, P.R.China)

［Abstract］ The superplastic behavior of adding 0.22%Sc into the Al-6Mg alloy was studied by simple superplastic pretreatment process--warm rolling and cold rolling. The optimum superplastic temperature and strain rate of the alloys were defined and satisfactory results were obtained during the superplastic deformation at 811 K and initial strain rate ε0=1.67×10-3s-1. The average elongation of Al-6Mg-0.22Sc alloys reaches to 1 125%, and the maximum elongation is 1 200%, maximum m value (strain rate sensitive index) is 0.879. But under the same condition the elongation and maximum m value for Al-6Mg alloy were only 377% and 0.595, respectively. The superplastic deforming mechanism for Al-6Mg-0.22Sc alloys was also discussed.

［Key words］ Al-6Mg-0.22Sc alloy; Al-Mg alloy; superplasticity
［CLC number］ TG 135+.3
［Document code］ A

［Received date］ 2000-03-02； ［Accepted date］ 2000-09-06