ZM5镁合金TIG焊接接头组织与力学性能

doi:10.11868/j.issn.1001-4381.2016.06.014

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Abstract The ZM5 magnesium alloy plates were welded by TIG welding method. The microstructural characteristics and mechanical properties of ZM5 magnesium alloy joint were studied by optical microscopy, microhardness and tensile testers. The results show that the TIG weld joint of ZM5 magnesium alloy is composed of heat affected zone, partially melted zone and weld metal. The heat affected zone is consisted of primary α-Mg phase and eutectic phase that is composed of eutectic α-Mg and eutectic β-Mg₁₇Al₁₂ phase and mainly precipitated at grain boundaries. In the partially melted zone, the eutectic phase is not only increasingly precipitated at grain boundaries, but also dispersed in grains, and the growth of the β-Mg₁₇Al₁₂ phase is obviously observed. The microstructure in the weld is the typical dendritic morphology. The dendrites are considered as primary α-Mg phase, and the interdendritic regions are α+β eutectic phase. The difference in the microstructure of the heat affected zone, partially melted zone and weld results in their various microhardness values, and leads to the smaller tensile strength and ductility in the ZM5 alloy weld joint than parent metal.

Key words： magnesium alloy TIG weld microstructure mechanical property

Received: 23 June 2015 Published: 13 June 2016

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	Articles by authors
	QIN Ren-yao
	SUN Bing-bing
	ZHAO Heng-yue
	GUO Shao-qing
	TANG Si-yi
	ZHANG Xue-jun

Cite this article:

QIN Ren-yao,SUN Bing-bing,ZHAO Heng-yue, et al. Microstructure and Mechanical Properties of TIG Weld Joint of ZM5 Magnesium Alloy[J]. Journal of Materials Engineering, 2016, 44(6): 92-97.

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http://jme.biam.ac.cn/EN/10.11868/j.issn.1001-4381.2016.06.014 OR http://jme.biam.ac.cn/EN/Y2016/V44/I6/92

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