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<p>Irradiation-induced defects such as helium bubbles and dislocation loops degrade the performance of nuclear materials. Post-irradiation thermal annealing for damage repair often leads to microstructural coarsening. Here, we demonstrate a recovery pathway using high-current-density electropulsing in a nickel-based alloy. Electropulsing significantly reduces the density of bubbles and loops. Multi-scale simulations reveal that the healing mechanism involves current-enhanced bubble dissociation and the sweep-out of loops by electropulsing-activated gliding dislocations. This defect evolution mitigates irradiation hardening without the drawbacks of thermal treatment, establishing electropulsing as a viable physical strategy for repairing irradiation damage of nuclear components.</p><p></p>

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Electropulsing-assisted repair of irradiation damage in a Nickel-based alloy

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月15日

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  • Jie Gao,
  • Zhenbo Zhu,
  • Yuqiao Mao,
  • Ruikun Wang,
  • Hefei Huang

摘要

Irradiation-induced defects such as helium bubbles and dislocation loops degrade the performance of nuclear materials. Post-irradiation thermal annealing for damage repair often leads to microstructural coarsening. Here, we demonstrate a recovery pathway using high-current-density electropulsing in a nickel-based alloy. Electropulsing significantly reduces the density of bubbles and loops. Multi-scale simulations reveal that the healing mechanism involves current-enhanced bubble dissociation and the sweep-out of loops by electropulsing-activated gliding dislocations. This defect evolution mitigates irradiation hardening without the drawbacks of thermal treatment, establishing electropulsing as a viable physical strategy for repairing irradiation damage of nuclear components.