Promotion mechanism of the pulse current on the superplastic deformation of AZ31 magnesium alloy

被引：4
|
作者：
Li, Chao [1 ,2 ]
Jiang, Shaosong [1 ]
Zhang, Kaifeng [1 ]
Zhao, Zhipeng [1 ]
机构：
[1] Harbin Inst Technol, Natl Key Lab Precis Heat Proc Met, Harbin 150001, Peoples R China
[2] Harbin Univ Sci & Technol, Sch Mat Sci & Engn, Harbin 150040, Peoples R China
来源：
ACTA METALLURGICA SINICA-ENGLISH LETTERS | 2012年 / 25卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Metal forming and shaping; Microstructure; AZ31 magnesium alloy; Cavitation; Pulse current;
D O I：
10.11890/1006-7191-122-153
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The effects of pulse current on the superplastic deformation of AZ31 magnesium alloy with different microstructures were examined. The results of TEM analysis showed that the dislocation movement was mainly glide, and the dislocation lines were approximate parallel with few dislocation tangles observed, which indicated that the dislocation movement was promoted during the deformation, and therefore the formability of the coarse-grained AZ31 magnesium alloy was enhanced by the pulse current. This effect was also indicated by the asymmetrical contour of the free bulging sample, which was observed in the unidirectional pulses auxiliary equi-biaxial tensile test of coarse-grained alloy. In addition, the phenomenon of the restrained cavity growth caused by the thermoelectrical effect of the pulse current was discovered and studied.
引用
收藏
页码：153 / 159
页数：7
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