Tungsten holds immense promise as a plasma-facing material in fusion reactors. However, helium bubble formation and the resulting structural changes raise concerns about its long-term performance. To address these issues, it is crucial to have a detailed understanding of the changes that occur within tungsten during the fusion process. A significant change is the helium pressure-induced phase transformation in tungsten from its body-centered cubic α phase to the face-centered cubic γ phase. This study investigates helium clustering behavior within both the α and γ phases of tungsten using density functional theory. Our calculations suggest that helium clustering is less favorable in the transformed γ phase compared to the α phase, indicating that the γ phase is more resistant to helium-induced degradation.

中文翻译：

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与原始 α 相相比，探索钨辐照诱导γ相中的氦行为


钨作为聚变反应堆中面向等离子体的材料具有巨大的前景。然而，氦气气泡的形成和由此产生的结构变化引发了对其长期性能的担忧。为了解决这些问题，详细了解熔合过程中钨内部发生的变化至关重要。一个显着的变化是钨中氦压诱导的相变，从其体心立方α相转变为面心立方γ相。本研究使用密度泛函理论研究了钨 α 相和 γ 相中的氦聚集行为。我们的计算表明，与α相相比，转化γ相中的氦聚集不太有利，这表明γ相对氦诱导的降解更具抵抗力。