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Research Article

Effect of tool plunge depth on the microstructure and fracture behavior of AZ91 magnesium alloy refill friction stir spot welded joints

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  • Received: 7 January 2020Revised: 9 March 2020Accepted: 18 March 2020Available online: 20 March 2020
  • Refill friction stir spot welding (RFSSW) was applied to join the 2-mm-thick AZ91D-H24 magnesium alloy sheets successfully, and the effect of tool plunge depth on the microstructure and fracture behavior of the joints were investigated in detail. The sound surface formation of the joints can be obtained as the plunge depths were 2.0 mm and 2.5 mm. The plunge depth significantly affected the height of hook, and the higher plunge depth corresponded to the more severe upward bend of hook whose morphology compromised the tensile-shear properties of the joints. The hardness reached a minimum at the TMAZ due to the precipitation phases of this zone dissolved into the α-matrix during the welding process. The fracture modes of RFSSW joints can be divided into three types: shear fracture, plug fracture and shear-plug fracture. Among them, the joint under shear-plug fracture had the best tensile-shear load of 6400 N.
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Effect of tool plunge depth on the microstructure and fracture behavior of AZ91 magnesium alloy refill friction stir spot welded joints

  • 1. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
  • 2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

Abstract: Refill friction stir spot welding (RFSSW) was applied to join the 2-mm-thick AZ91D-H24 magnesium alloy sheets successfully, and the effect of tool plunge depth on the microstructure and fracture behavior of the joints were investigated in detail. The sound surface formation of the joints can be obtained as the plunge depths were 2.0 mm and 2.5 mm. The plunge depth significantly affected the height of hook, and the higher plunge depth corresponded to the more severe upward bend of hook whose morphology compromised the tensile-shear properties of the joints. The hardness reached a minimum at the TMAZ due to the precipitation phases of this zone dissolved into the α-matrix during the welding process. The fracture modes of RFSSW joints can be divided into three types: shear fracture, plug fracture and shear-plug fracture. Among them, the joint under shear-plug fracture had the best tensile-shear load of 6400 N.

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