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Microstructures and mechanical properties of AZ91 alloys prepared by multi-pass friction stir processing

Published online by Cambridge University Press:  15 May 2018

Fang Chai ,
Fei Yan ,
Wei Wang ,
Qichen Lu  and
Xiang Fang
Fang Chai
Affiliation:
Hubei Key Laboratory of Advanced Technology (Wuhan University of Technology), Wuhan 430070, China; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China; and School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China
Fei Yan
Affiliation:
Hubei Key Laboratory of Advanced Technology (Wuhan University of Technology), Wuhan 430070, China; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China; and School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China
Wei Wang*
Affiliation:
Hubei Key Laboratory of Advanced Technology (Wuhan University of Technology), Wuhan 430070, China; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China; and School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China
Qichen Lu
Affiliation:
Hubei Key Laboratory of Advanced Technology (Wuhan University of Technology), Wuhan 430070, China; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China; and School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China
Xiang Fang
Affiliation:
Hubei Key Laboratory of Advanced Technology (Wuhan University of Technology), Wuhan 430070, China; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China; and School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China
*
a)Address all correspondence to this author. e-mail: wei.wang@whut.edu.cn
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Abstract

AZ91 magnesium plates with a thickness of 6 mm were subjected to one- and two-pass friction stir processing (FSP). Microstructures and mechanical properties of the experimental materials were investigated. The results show that FSP can significantly refine the microstructures of magnesium alloys, and two-pass FSP can prepare slightly finer grains in comparison with one-pass FSP. Some coarse β-Mg17Al12 phases existed in the first pass FSP break and dissolve into the matrix under the action of the second pass FSP. Microhardness distribution of the two-pass FSP AZ91 alloy exhibits no too much difference with that of the one-pass FSP AZ91 alloy. Due to further finer microstructures, the tensile properties of the two-pass FSP alloy are slightly higher than those of the one-pass FSP alloy. Both FSP AZ91 alloys show typical ductile fracture characteristics, while the dimples on the two-pass FSP specimen are much deeper and increase in quantity.

Keywords

multi-pass friction stir processingAZ91 magnesium alloymicrostructuremechanical properties
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 12 , 28 June 2018 , pp. 1789 - 1796
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Copyright
Copyright © Materials Research Society 2018 

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