氦离子辐照钨的膨胀和起泡的主要机理特征
Key mechanistic features of swelling and blistering of helium-ion-irradiated tungsten
摘要：
采用氦离子显微镜对单晶钨进行特定剂量控制辐照（25 keV），并通过氦离子显微镜、原子力显微镜和透射电子显微镜（聚焦离子束铣削截面）进行分析，研究了氦离子诱导的单晶钨膨胀和起泡。我们的测量结果表明，在氦峰的深度处形成泡状腔，并且纳米气泡聚结以在离子停止范围的包络内形成纳米裂纹，从而引起泡状壳的膨胀。这些结果提供了第一个直接的实验证据的气泡破裂机制的框架内提出的气泡形成的气体压力模型。
英文摘要：
Helium-ion-induced swelling and blistering of single-crystal tungsten is investigated using a Helium Ion Microscope for site-specific dose-controlled irradiation (at 25 keV) with analysis by Helium Ion Microscopy, Atomic Force Microscopy and Transmission Electron Microscopy (cross-sectioning by Focused Ion Beam milling). Our measurements show that the blister cavity forms at the depth of the helium peak and that nanobubbles coalesce to form nanocracks within the envelope of the ion stopping range, causing swelling of the blister shell. These results provide the first direct experimental evidence for the interbubble fracture mechanism proposed in the framework of the gas pressure model for blister formation.
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