![](bg1.png)
Experimental Investigation on Pulsed Current Influence on
U-bending of AZ31B Magnesium Alloy
H Li
1
, L Wang
2
, D W Ao
1
, X R Chu
1, *
and J Gao
1
1
School of Mechanical, Electrical&Information Engineering, Shandong University,
Weihai, Weihai 264209, Shandong, China
2
Weifang GeorTek Electronics Co., Ltd. Weifang 261205, China
Corresponding author and e-mail: X R Chu, xrchu@sdu.edu.cn
Abstract. The electropulse effect (EPE) is combined with the bending forming of magnesium
alloy sheet. Through electropulse assisted (EPA) magnesium alloy U-bending test, the
influence of current parameters on the U-bending properties of magnesium alloy sheet was
studied. Through the analysis of the microstructure of magnesium alloy sheet, the mechanism
of EPE on the bending forming performance of magnesium alloy sheet was explored. It was
found that the pulse current promotes the occurrence of dynamic recrystallization of the
magnesium alloy, improves the forming ability of the magnesium alloy sheet, and reduces the
springback angle of the magnesium alloy sheet bending.
1. Introduction
Magnesium and magnesium alloys are known as “green material” in the 21st Century for their
excellent mechanical properties. Magnesium and magnesium alloys are widely used in aerospace,
automotive, electronics, communications, and other fields due to their good performance [1].
However, due to the hexagonal crystal structure of magnesium alloys, magnesium alloys have poor
plastic forming ability at room temperature, which limits the application of magnesium alloys in the
industrial field and has become a major factor restricting the development of magnesium alloys in the
industry [2].
Guoyi Tang et al. [3-5] studied the electropulse drawing and rolling of magnesium alloys found
that pulsed current can promote the movement and climbing of movable dislocations, open the
dislocation tangles, change the dislocation density, reduce the flow stress of the material, and find
that the pulse current can promote dynamic recrystallization of magnesium alloys at lower
temperatures. Perkin [6] studied the forming properties of aluminum alloys and other metals through
electropulsing upsetting experiments, and found that the electropulsing significantly improved the
plastic forming ability of aluminum alloys. The deformation before fracture was significantly
improved, and the deformation resistance decreased significantly. Bao et al. [7] studied the
electropulsing assisted(EPA)magnesium alloy incremental forming experiments found that the
parameters of the electropulse have a significant influence on the progressive forming limit of the
sheet. With the increase of the pulse current, the forming limit is significantly improved, and the
forming ability is significantly enhanced. It proved the existence of pure EPE. Conrad [8] proposed
that the pulsed current can increase the internal energy of the material and thus promote the thermal
604
Li, H., Wang, L., Ao, D., Chu, X. and Gao, J.
Experimental Investigation on Pulsed Current Influence on U-bending of AZ31B Magnesium Alloy.
In Proceedings of the International Workshop on Materials, Chemistry and Engineering (IWMCE 2018), pages 604-609
ISBN: 978-989-758-346-9
Copyright © 2018 by SCITEPRESS – Science and Technology Publications, Lda. All rights reserved