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Materials Science and Technology Volume 33, 2017 - Issue 4
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Original Articles

Fatigue fracture behaviour and thermographic analysis of friction stir-welded AZ31

X. ZhangCollege of Materials Science and Engineering, Taiyuan University of Technology, 79# West Yingze Street, Taiyuan030024, PR China
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H. ZhangCollege of Materials Science and Engineering, Taiyuan University of Technology, 79# West Yingze Street, Taiyuan030024, PR China;Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan University of Technology, 79# West Yingze Street, Taiyuan030024, PR ChinaCorrespondence[email protected]
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Z. YanCollege of Materials Science and Engineering, Taiyuan University of Technology, 79# West Yingze Street, Taiyuan030024, PR China;Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan University of Technology, 79# West Yingze Street, Taiyuan030024, PR China
,
G. WangCollege of Materials Science and Engineering, Taiyuan University of Technology, 79# West Yingze Street, Taiyuan030024, PR China
,
F. LiuCollege of Materials Science and Engineering, Taiyuan University of Technology, 79# West Yingze Street, Taiyuan030024, PR China
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W. WangCollege of Materials Science and Engineering, Taiyuan University of Technology, 79# West Yingze Street, Taiyuan030024, PR China;Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan University of Technology, 79# West Yingze Street, Taiyuan030024, PR China
Pages 464-471 | Received 31 May 2016, Accepted 13 Aug 2016, Published online: 01 Sep 2016
 
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Abstract

The fatigue fracture behaviour and thermographic analysis of friction stir-welded (FSW) AZ31 was studied. It showed that fatigue fracture at the advancing side (AS). Heat-affected zone (HAZ) contained a greater fraction of coarse grains and a small amount of twins. The grains in the thermo-mechanically affected zone were smaller, indicating that grains may originate from incompletely dynamic recrystallisation during the FSW. The nugget zone is composed of equiaxed grains caused by the dynamic recrystallisation. During cyclic deformation, hysteresis loops from the AS of the FSW joints with the stain amplitude were higher than the retreating side of the FSW joints, the temperature of HAZ at AS is higher than other regions.

Acknowledgement

The work was supported by the Natural Science Foundation of China [Grant Numbers 51175364, 51505322]; and Natural Science Foundation of Shanxi Province [Grant Number 2013011014-3].

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