Abstract Due to virtually no solubility, He atoms implanted or created inside materials tend to form bubbles, which are known to damage material properties through embrittlement. Higher He density in nano-sized bubbles was observed both experimentally and computationally in Ni ( 100 − x ) Fex-alloy samples compared to Ni. The bubbles in the Ni ( 100 − x ) Fex-alloys were observed to be faceted, whereas in elemental Ni they were more spherical. Molecular dynamics simulations showed that stacking fault structures formed around bubbles at maximum He density. Higher Fe concentrations stabilize stacking fault structures, suppress evolution of dislocation network around bubbles and suppress complete dislocation emission, leading to higher He density.

中文翻译：

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Ni(1-x)Fe合金气泡内氦密度增加的原因

摘要 由于几乎没有溶解性，注入或在材料内部产生的氦原子往往会形成气泡，众所周知，气泡会通过脆化破坏材料特性。与 Ni 相比，在 Ni ( 100 - x ) Fex 合金样品中通过实验和计算均观察到纳米级气泡中更高的 He 密度。观察到 Ni ( 100 - x ) Fex 合金中的气泡是多面的，而元素 Ni 中的气泡更呈球形。分子动力学模拟表明，在最大 He 密度下，气泡周围形成了堆垛层错结构。较高的 Fe 浓度稳定堆垛层错结构，抑制气泡周围位错网络的演化并抑制完全位错发射，导致更高的 He 密度。