A mechanism of surface blistering on metals irradiated with helium ions

摘要: Abstract The formation of surface blisters on metals bombarded with high doses helium ions is explained by the coalescence equilibrium bubbles, condition for being satisfied when bubbles are large enough to touch. At normal temperatures it shown that once this threshold reached, successive events virtually spontaneous and lead rapidly excess internal bubble pressure necessary deform metal surface. However, at bombardment build-up could be prevented presence thermal vacancies. This appears explain observed transition from a blistered pinhole between 0.4 0.5 absolute melting point. paper includes quantitative treatment mechanism comparison experimental results. Although there not exact agreement, consistent form variation critical dose ion energy. In an appendix, problem growth sub-vacancy migration briefly discussed.