Study of Bending Strength and Fracture Behavior of ZK60 Mg Alloy Welded by Friction Stir Welding
WANG Xiangjie1, FENG Lei2, WU Jingting3, XIAO Xinhua1, SU Beibei1
1 Department of Electromechanical Engineering, Hubei Polytechnic University, Huangshi 435003, China; 2 Department of Traffic Engineering, Hubei Engineering Institute, Huangshi 435000, China; 3 Aerospace Products Center, Tianjin Institute of Aerospace Mechanical and Electrical Equipment, Tianjin 300301, China
Abstract: Severe plastic deformation is occurred in weld zone during friction stir welding, which causes significant changes of microstructure and mechanical properties of the joints. But few studies are found on the bending properties of friction stir welded Mg alloys. In this paper, casting ZK60 Mg alloy in solid solution state was used as the research object. Two types of three-point bending tests, including surface test and root test, were used to explore the effect of microstructure evolution of ZK60 Mg alloy during friction stir welding on the bending strength and fracture beha-vior. It is found that significant grain refinement is observed in weld zone, and the average grain size is reduced from ~59 μm to ~4 μm. Friction stir welded ZK60 Mg alloy presents higher bending properties than that of the base metal sample. And the bending strength of surface test sample is higher than that of the root test sample. After a large deflection-strain bending test, both the base metal and surface test samples are cracked. But crack initiation and expansion is not observed in the root test sample. It is considered that abrupt change of texture at the boundary of transition zone/stir zone has little effect on the fracture behavior of friction stir welded ZK60 Mg alloy during bending tests.
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2020, Vol. 34 
