Effects of Helium Implantation and Subsequent Electron Irradiation on Microstructures of Fe-11 wt.％ Cr Model Alloy

摘要

Helium effects on dislocation and cavity formation of Fe-11 wt.％ Cr model alloy are investigated.Single-beam (electron) and dual-beam (He+ /e-) irradiations are performed at 350℃ and 400℃ using an ultra-high voltage electron microscope combined with ion accelerators.In-situ observation shows that the growth rate of dislocation loops is reduced in the helium pre-injected specimen.The mean size of cavities decreased in the helium preinjected specimen.The possible mechanisms are discussed.