Defect annihilation in heavy ion irradiated polycrystalline gold
Defect annihilation in heavy ion irradiated polycrystalline gold
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DOI：
10.1016/j.matlet.2020.128694
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发表时间：
2021
影响因子：
3
通讯作者：
Zahabul Islam;C. Barr;K. Hattar;A. Haque
中科院分区：
文献类型：
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作者：
Zahabul Islam;C. Barr;K. Hattar;A. Haque
在透射电子显微镜下，我们研究了电子风力（EWF）与原位离子辐照缺陷的相互作用。采用5 × 1015ions/cm2（每原子45个位移）自离子辐照纳米晶金试样，产生高密度位移损伤。我们还开发了一个分子动力学模拟模型来了解相关的原子尺度机制。实验和模拟都表明，即使在低温下，EWF也能赋予缺陷显著的迁移率，从而在几分钟内实现缺陷的迁移和消除。我们提出EWF与缺陷相互作用产生高度可滑的肖克利部分位错，从而使缺陷快速和低温湮灭成为可能。
In this study, we explore the interaction of electron wind force (EWF) with defects originating from ion irradiation in-situ inside a transmission electron microscope. Nanocrystalline gold specimens were self-ion irradiated to a dose of 5 × 1015ions/cm2(45 displacement per atom) to generate a high density of displacement damage. We also developed a molecular dynamics simulation model to understand the associated atomic scale mechanisms. Both experiments and simulations show that the EWF can impart significant defect mobility even at low temperatures, resulting in the migration and elimination of defects in a few minutes. We propose that the EWF interacts with defects to create highly glissile Shockley partial dislocations, which makes the fast and low temperature defect annihilation possible.