您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 6    December 2004

[PDF Download]    [Flash Online]

    

Superplasticity of fine-grained AZ31 Mg alloy sheets
YIN De-liang(尹德良), ZHANG Kai-feng(张凯锋), 
WANG Guo-feng(王国峰), HAN Wen-bo(韩文波)

School of Material Science and Engineering, Harbin Institute of Technology,
Harbin 150001, China

Abstract: Superplastic mechanical properties of fine-grained AZ31 Mg alloy sheets in the temperature range of 250-450℃ and strain rate range of 0.7×10-3-1.4×10-1s-1 were investigated by uniaxial tensile tests. The microstructure evolution during the superplastic deformation of AZ31 Mg alloy was examined by means of metallurgical microscope and transmission electronic microscope(TEM). It is shown that, fine-grained AZ31 Mg alloy starts to exhibit superplasticity at 300℃ and the maximum elongation of 362.5% is obtained at 400℃ and 0.7×10-3s-1. The predominate superplastic mechanism of AZ31 Mg alloy in the temperature range of 300-400℃ is grain boundary sliding(GBS). Twinning caused by pile-up of dislocations during the early stage of superplastic deformation is the hardening mechanism, and dynamic continuous recrystallization (DCRX) is the important softening mechanism and grain stability mechanism during the superplastic deformation of the alloy.

 

Key words:  AZ31 Mg alloy; superplasticity; microstructure evolution; dynamic recrystallization

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn