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<p>The pinning phenomenon on the grain boundary of friction-stir-welded Al–Si alloy joints and the subsequent evolution of abnormal grain growth (AGG) are investigated and analyzed using a modified Humphreys’ model. The results demonstrate that when the pinning force (<i>P</i><sub><i>Z</i></sub>) is below the upper limit of pinning, the sizes of abnormally growing grains increase with <i>P</i><sub><i>Z</i></sub>, and the AGG process takes longer to complete. However, once <i>P</i><sub><i>Z</i></sub> exceeds the upper limit, AGG is suppressed effectively.</p>

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Influence of Pinning Force on Abnormal Grain Growth Evolution in Friction-Stir-Welded Al–Si Alloy Joints

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Li-Jia Tan,
  • Zhao Yang,
  • Jian-Qi Lu,
  • Kang-Hsien Fan,
  • Wen-Hao Gong

摘要

The pinning phenomenon on the grain boundary of friction-stir-welded Al–Si alloy joints and the subsequent evolution of abnormal grain growth (AGG) are investigated and analyzed using a modified Humphreys’ model. The results demonstrate that when the pinning force (PZ) is below the upper limit of pinning, the sizes of abnormally growing grains increase with PZ, and the AGG process takes longer to complete. However, once PZ exceeds the upper limit, AGG is suppressed effectively.