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The microstructureMicrostructure characteristics of different zones in 7075-T6 aluminum alloyAluminum alloys (AlZnMgCu1.5) joints produced by impulse friction stir welding (IFSWImpulse Friction Stir Welding (IFSW)) and conventional friction stir weldingFriction stir welding (FSW) were investigated by means of electron backscatter diffraction (EBSDElectron Backscatter Diffraction (EBSD)) analysis. A fine-grained equiaxed microstructureMicrostructure was formed in the stir zones (SZ) of the joints. The grain size range of SZ-IFSWImpulse Friction Stir Welding (IFSW) is 5.78–22.74 μm, the grain size range of SZ-FSW is 6.04–27.54 μm. The additional plastic deformation caused by the impulses is beneficial to grain refinement. The distribution ratios of low-angle grain boundaries (LAGBs) and high-angle grain boundaries (HAGBs) in the SZ of the studied joints were calculated. The addition of impulses promotes continuous dynamic recrystallization in SZ, which allows the LAGBs to transform into HAGBs more effectively. The SZ and thermo-mechanically affected zone (TMAZ) of IFSWImpulse Friction Stir Welding (IFSW) become wider under the additional plastic deformation. The results of microhardness distribution and tensile tests are presented and analyzed.

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EBSD Analysis of AA7075-T6 Thin Sheets Butt Joints Obtained by Impulse Friction Stir Welding

  • 会议论文

  • 发表日期：

    2025年

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  • Keqi Wang,
  • Anton Naumov,
  • Qibao Li,
  • Baiyang Chen,
  • Peihu Gao

摘要

The microstructureMicrostructure characteristics of different zones in 7075-T6 aluminum alloyAluminum alloys (AlZnMgCu1.5) joints produced by impulse friction stir welding (IFSWImpulse Friction Stir Welding (IFSW)) and conventional friction stir weldingFriction stir welding (FSW) were investigated by means of electron backscatter diffraction (EBSDElectron Backscatter Diffraction (EBSD)) analysis. A fine-grained equiaxed microstructureMicrostructure was formed in the stir zones (SZ) of the joints. The grain size range of SZ-IFSWImpulse Friction Stir Welding (IFSW) is 5.78–22.74 μm, the grain size range of SZ-FSW is 6.04–27.54 μm. The additional plastic deformation caused by the impulses is beneficial to grain refinement. The distribution ratios of low-angle grain boundaries (LAGBs) and high-angle grain boundaries (HAGBs) in the SZ of the studied joints were calculated. The addition of impulses promotes continuous dynamic recrystallization in SZ, which allows the LAGBs to transform into HAGBs more effectively. The SZ and thermo-mechanically affected zone (TMAZ) of IFSWImpulse Friction Stir Welding (IFSW) become wider under the additional plastic deformation. The results of microhardness distribution and tensile tests are presented and analyzed.