Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 17    Special 1    November 2007

[PDF Download]        

    

High strain rate superplasticity of AZ31 alloy
ZHOU Hai-tao(周海涛), JIANG Yong-feng(蒋永锋),
ZHONG Jian-wei(钟建伟), ZHAO Zhong-kai(赵仲恺), LI Qing-bo(李庆波)

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract:The superplasticity of coarsed grain AZ31 magnesium alloy was investigated in the temperature range of 623−723 K at strain rates from 10−3 to 10−1 s−1. It is found that with increasing strain rates, the elongation increases firstly, and then reaches the maximum value of 278% nearly at the strain rate of 5×10−2 s−1. The best superplastic conditions are at 723 K and at the strain rate of 5×10−2 s−1. During superplastic deformation, it is found that the mean grain size decreases from original 30 μm to 18 μm, indicating grain refinement is the dominant process at the initial stage of the superplastic deformation, meanwhile the grains become more homogenous and most of the grains are still equiaxed. However, the size and distribution of deformation cavity vary with deformation conditions at the last stage of deformation. At best superplastic condition, the cavity exhibits homogenous and ball-like. It is indicated that the dominant superplastic deformation mechanism at high strain rate is both grain refinement and grain boundary sliding.

 

Key words: AZ31 magnesium alloy; high strain rate superplasticity; cavity

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com