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Grain refining and improving mechanical properties of AZ31 Mg alloy sheets by multi-pass warm rolling with falling temperature

Published online by Cambridge University Press:  03 September 2018

Yanchun Zhao ,
Hua Zhang ,
Jianfeng Fan ,
Lifei Wang ,
Qiang Zhang ,
Cheng Peng ,
Hongbiao Dong  and
Bingshe Xu
Yanchun Zhao
Affiliation:
Department of Materials Science and Engineering, Yangze Normal University, Chongqing 408100, China
Hua Zhang*
Affiliation:
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China
Jianfeng Fan
Affiliation:
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China
Lifei Wang
Affiliation:
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China
Qiang Zhang*
Affiliation:
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China
Cheng Peng
Affiliation:
Department of Materials Science and Engineering, Yangze Normal University, Chongqing 408100, China
Hongbiao Dong
Affiliation:
Department of Engineering, University of Leicester, Leicester LE1 7RH, U.K.
Bingshe Xu
Affiliation:
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China
*
a)Address all correspondence to this author. e-mail: zhanghua2009@126.com
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Abstract

Multi-pass warm rolling with falling temperature was proposed and investigated to obtain AZ31 Mg alloy sheets with a fine-grained microstructure. The results indicated that the grain microstructure of AZ31 alloy sheets was successfully refined from 22.1 to 4.5 μm after multi-pass warm rolling with falling temperature and annealing. Compared to the as-received sheet, the multi-pass warm rolled sheets in annealed condition exhibited weaker (0001) basal texture intensity, which resulted in the significantly increased Schmid factor of 〈a〉 basal slip. After multi-pass warm rolling with falling temperature, the rolled sheets in annealed condition also exhibited much better mechanical properties, e.g., higher tensile strength, larger fracture elongation, and higher Erichsen value, especially the IE of 8-pass warm rolled sheet in annealed condition was significantly increased by ∼33% under the same thickness, which could be attributed to the refined grain microstructure and the weakened basal texture.

Keywords

AZ31 Mg alloymulti-pass warm rollingmicrostructuregrain refiningmechanical property
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 18 , 28 September 2018 , pp. 2827 - 2834
Copyright
Copyright © Materials Research Society 2018 

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