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<p>Friction stir welding (FSW) was conducted on 4&#xa0;mm-thick rolled 5083 aluminum alloy, and the superplastic behavior and deformation mechanisms of the weld nugget zone (WNZ) were investigated under various temperatures and strain rates. Microstructural analysis showed a highly refined equiaxed grain structure in the WNZ with an average grain size of 3.75&#xa0;μm. High-temperature tensile tests revealed a maximum post-fracture elongation of ~ 404% in this region under conditions of 450&#xa0;°C and a strain rate of 1 × 10<sup>− 3</sup> s<sup>− 1</sup>. The remarkable elongation is mainly attributed to the refined equiaxed grains and the pronounced prevalence of high-angle grain boundaries (accounting for 86.4%) within the WNZ. Grain boundary slip (GBS) is identified as the dominant mechanism governing the superplastic deformation in the WNZ of the 5083aluminum alloy FSW joint.</p>

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Investigation of superplastic behavior and deformation mechanisms in the nugget zone of 5083 aluminum alloy friction stir welded joints

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Yao Wang,
  • Yupeng Li,
  • Wenbiao Gong,
  • Jinxin Liu,
  • Yubo Wang,
  • Peng Lv,
  • Xizhen Wang,
  • Rui Zhang

摘要

Friction stir welding (FSW) was conducted on 4 mm-thick rolled 5083 aluminum alloy, and the superplastic behavior and deformation mechanisms of the weld nugget zone (WNZ) were investigated under various temperatures and strain rates. Microstructural analysis showed a highly refined equiaxed grain structure in the WNZ with an average grain size of 3.75 μm. High-temperature tensile tests revealed a maximum post-fracture elongation of ~ 404% in this region under conditions of 450 °C and a strain rate of 1 × 10− 3 s− 1. The remarkable elongation is mainly attributed to the refined equiaxed grains and the pronounced prevalence of high-angle grain boundaries (accounting for 86.4%) within the WNZ. Grain boundary slip (GBS) is identified as the dominant mechanism governing the superplastic deformation in the WNZ of the 5083aluminum alloy FSW joint.