Microstructural characterisation and liquation behaviour of laser welded joint of fine grained AZ91 magnesium alloy thin sheets

Z. M. YangCollege of Material Science and Engineering, Hunan University, Changsha410082, China;Hunan Provincial Key Laboratory of Spray Deposition Technology and Application, Hunan University, Changsha410082, China

H. G. YanCollege of Material Science and Engineering, Hunan University, Changsha410082, China;Hunan Provincial Key Laboratory of Spray Deposition Technology and Application, Hunan University, Changsha410082, ChinaCorrespondence[email protected]

J. H. ChenCollege of Material Science and Engineering, Hunan University, Changsha410082, China;Hunan Provincial Key Laboratory of Spray Deposition Technology and Application, Hunan University, Changsha410082, China

B. SuCollege of Material Science and Engineering, Hunan University, Changsha410082, China;Hunan Provincial Key Laboratory of Spray Deposition Technology and Application, Hunan University, Changsha410082, China

G. H. ZhangCollege of Material Science and Engineering, Hunan University, Changsha410082, China;Hunan Provincial Key Laboratory of Spray Deposition Technology and Application, Hunan University, Changsha410082, China

Q. ZhaoCollege of Material Science and Engineering, Hunan University, Changsha410082, China;Hunan Provincial Key Laboratory of Spray Deposition Technology and Application, Hunan University, Changsha410082, China

Abstract

Fine grained AZ91 sheets of 1 mm in thickness were successfully welded by autogenous laser beam welding and laser beam welding with filler strip. Both welded joints are characterised by fine equiaxed dendrites in the fusion zones and free from significant grain coarsening in the heat affected zones. There are two kinds of liquation reactions in the partially melted zone of the autogenous laser beam welding joint, which are associated with the melting of residual bulky β-Mg₁₇Al₁₂ phase and the constitutional liquation of submicrometre β-Mg₁₇Al₁₂ precipitates. No liquation reaction is detected in the welded joint obtained by laser beam welding with filler strip. The laser beam welding joint with filler strip for AZ91 thin sheets is free from evident collapse.

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Acknowledgements

The research is supported by the Natural Science Foundation Project of China (grant no. 51274092) and the Natural Research Foundation for the Doctoral Program of Higher Education of China (grant no. 20120161110040).

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Microstructural characterisation and liquation behaviour of laser welded joint of fine grained AZ91 magnesium alloy thin sheets

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Microstructural characterisation and liquation behaviour of laser welded joint of fine grained AZ91 magnesium alloy thin sheets

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