Accessible Requires Authentication Published by De Gruyter November 29, 2018

The influence of twinning on plastic constitutive description of a magnesium alloy

Heng Li, Zhao Liu, Zhen Zhang, Jinhua Peng, Yaozu Li, Peng Guo and Yucheng Wu

Abstract

During uniaxial compression tests of a twin-roll cast AZ31 alloy, the orientation induced anisotropy only lay in the initial strain range, which was attributed to the different twinning systems that were involved. Regardless of the initial orientation, contraction twinning always played an important role at higher strain range, especially with higher strain rate and lower temperature. At temperature higher than 300 °C, dynamic recrystallization would dominate. A single modified Arrhenius equation ˙=[sinh(ασ)]nexp(Q/RT) was used to describe the flow behavior for all experimental conditions. The n value was found to be higher at lower temperature when compression twinning was prevalent. Meanwhile the deformation activation energy was somewhat lower, which was attributed to the twinning induced softening effect.


*Correspondence address, Zhen Zhang, School of Materials Science and Engineering, Hefei University of Technology, Tunxi Road, Hefei 230001, P.R. China, Tel.: +860551-62901362, E-mail: , Web: http://mse.hfut.edu.cn/

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Received: 2018-03-28
Accepted: 2018-07-20
Published Online: 2018-11-29
Published in Print: 2018-12-10

© 2018, Carl Hanser Verlag, München