Effects of thermomechanical treatments on the microstructures and mechanical properties of GTA-welded AZ31B magnesium alloy

Thermomechanical treatments were carried out to improve the properties of AZ3 IB joints prepared by gas tungsten arc welding. The microstructures of the joints were studied by optical microscopy and scanning electron microscopy with energy-dispersive spectrometry. Tensile tests and hardness tests we...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2012-10, Vol.19 (10), p.945-950
Main Authors: Chu, Ya-Jie, Chen, Man, Li, Xiao-Quan, Wu, Shen-Qing, Yang, Zong-Hui
Format: Article
Language:English
Subjects:
Gas tungsten arc welding
Grains
Hardness tests
Magnesium base alloys
Mechanical properties
Microstructure
Segregations
Spectrometry
Thermomechanical treatment
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Summary:Thermomechanical treatments were carried out to improve the properties of AZ3 IB joints prepared by gas tungsten arc welding. The microstructures of the joints were studied by optical microscopy and scanning electron microscopy with energy-dispersive spectrometry. Tensile tests and hardness tests were performed to investigate the effects of thermomechanical treatments on the mechanical properties of the joints. It is found that the thermomechanical-treated joints show superior mechanical properties against the as-welded joints, and their ultimate tensile strength can reach more than 92% of the base material. This mainly attributes to the formation of fine equiaxed grains in the fusion zone. After thermomechanical treatments the dendrites are transformed to fine spherical grains, and the dendritic segregation can be effectively eliminated.
ISSN:1674-4799
DOI:10.1007/812613-012-0652-9