Abstract
4 MeV Ni ion irradiation was performed for pure Fe up to 50 dpa between 350°C and 500°C with and without simultaneous He ion injection to simulate and understand the fundamental irradiation behaviour of ferritic stainless steels in the fusion environment. Results were compared with those from electron (HVEM), neutron and proton irradiated pure Fe specimens. Voids were observed in Ni ion irradiated Fe at 450°C and 500°C for both single and dual beam irradiation, but no voids were observed at 350°C and 400°C. A number of small vacancy type dislocation loops were observed at 350°C and 400°C especially along dislocation lines. It is considered that these small loops are closely associated with cascade formation and contribute to suppression of void formation at low temperatures.
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