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Friction Stir Welding of Similar AZ91 Mg Alloy Sheets: Studies on Microstructure and Mechanical Properties

M. Yugandhar*, Rajay Vedaraj I. S.**

*-** Department of Mechanical Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, India.

Periodicity:May - July'2021
DOI : https://doi.org/10.26634/jme.11.3.17983

Abstract

Welding of Magnesium (Mg) alloys by fusion techniques is complex due to the highly reactive nature. Mg quickly oxidizes in the presence of oxygen. Therefore, solid state fusion welding processes is the best suitable technique to weld Mg alloys. In this work presently, AZ91 Mg alloy sheets were joined by Friction Stir Welding process (FSW) and the joint quality has been assessed by micro structural studies and micro hardness measurements. From the results, it has been observed that the joint has been free from defects and the large inter metallic which appeared in base alloy has been decreased in size. These observations suggest the dissolution of Al in Mg matrix. Micro hardness measurements also confirm the increased hardness in the weld zone which can be attributed to the effect of grain refinement and the development of super saturated grains in the weld zone.

Keywords

Joining, Magnesium Alloys, Friction Stir Welding, AZ91.

How to Cite this Article?

Yugandhar, M., and Vedaraj, I. S. R. (2021). Friction Stir Welding of Similar AZ91 Mg Alloy Sheets: Studies on Microstructure and Mechanical Properties. i-manager's Journal on Mechanical Engineering, 11(3), 10-19. https://doi.org/10.26634/jme.11.3.17983

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