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http://dx.doi.org/10.7782/JKSR.2016.19.4.417

Evaluation of Mechanical Properties and Analysis of Microstructure of AZ61 Magnesium Alloy Butt Joints by Friction Stir Welding  

Sun, Seung-Ju (Department of Railway System Engineering, University of Science and Technology)
Kim, Jung-Seok (Advanced Materials Research Team, Korea Railroad Research Institute)
Lim, Jae-Yong (Department of Mechanical Engineering)
Lee, Woo-Geun (Department of Railway System Engineering, University of Science and Technology)
Go, Yo-Han (Department of Advanced Materials Engineering, University of Science and Technology)
Kim, Young-Min (Implementation Research Division, Korea Institute of Materials Science)
You, Bong-Sun (Implementation Research Division, Korea Institute of Materials Science)
Publication Information
Journal of the Korean Society for Railway / v.19, no.4, 2016 , pp. 417-426 More about this Journal
Abstract
In this study, the optimal welding condition of an extruded AZ61 magnesium alloy plate was investigated through evaluation of the mechanical properties and microstructure in the friction stir welding zones. The friction stir welding conditions considered in this study were the tool rotation speeds of 400, 600, and 800rpm and the welding speeds of 200, 300, and 400mm/min. To evaluate the welding strength, tensile and hardness tests were carried out. Microstructures of the welded regions were examined using optical microscopes. Under a tool rotation speed of 800rpm and welding speed of 200mm/min, the joint showed the best joining properties. The UTS, yield strength, and elongation of the welded region showed values of 79.0%, 65.4%, and 30.1%, respectively, of those of the base metal.
Keywords
Magnesium alloy; Friction stir welding; Tensile test; Hardness test; Microstructure;
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Times Cited By KSCI : 5  (Citation Analysis)
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