The continuous formation and growth of voids induced by radiations in metallic materials may lead to significant microstructure damage and degradation of mechanical properties. In sharp contrast to the void swelling commonly observed in irradiated metallic materials, nanovoids in nanoporous metallic materials are found to shrink during radiation and thus nanovoids enhance the radiation tolerance of metallic materials. This article reviews recent studies on size-dependent void shrinkage in metallic materials subject to in situ heavy ion irradiation. Furthermore, we demonstrate the capability of machine learning in identifying and tracking the evolution of nanovoids. The physical mechanisms of radiation induced void shrinkage revealed by simulation studies are briefly summarized.

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原位重离子辐照金属材料空隙收缩的新研究

金属材料中由辐射引起的空隙的连续形成和增长可能导致显着的微观结构损伤和机械性能的退化。与通常在辐照金属材料中观察到的空隙膨胀形成鲜明对比的是，纳米多孔金属材料中的纳米空隙在辐射过程中会收缩，因此纳米空隙增强了金属材料的辐射耐受性。本文回顾了最近关于受原位重离子辐照的金属材料中尺寸相关的空隙收缩的研究。此外，我们展示了机器学习在识别和跟踪纳米空隙演变方面的能力。简要总结了模拟研究揭示的辐射诱导空隙收缩的物理机制。