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

doi:10.11890/1006-7191-122-153

Acta Metallurgica Sinica (English Letters) ›› 2012, Vol. 25 ›› Issue (2): 153-159.DOI: 10.11890/1006-7191-122-153

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

Chao LI^1,2, Shaosong JIANG¹, Kaifeng ZHANG¹, Zhipeng ZHAO¹

1. National Key Laboratory for Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
2. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China

Received:2011-08-25 Revised:2012-01-08 Online:2012-04-25 Published:2012-04-11
Contact: Shaosong JIANG

Abstract

Abstract: 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 he 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.

Key words: Metal forming and shaping, Microstructure, AZ31 magnesium alloy, Cavitation, Pulse current

Chao LI, Shaosong JIANG, Kaifeng ZHANG, Zhipeng ZHAO. Promotion mechanism of the pulse current on the superplastic deformation of AZ31 magnesium alloy[J]. Acta Metallurgica Sinica (English Letters), 2012, 25(2): 153-159.

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

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