Abstract
Low activation ferritic or martensitic alloys must have certain alloying elements either absent or in trace quantities, namely niobium, molybdenum, nickel, nitrogen and aluminum. Given these restrictions, nine bainitic and martensitic alloys have been designed as low activation materials covering the composition range Fe-2.25Cr to 12Cr and incorporating tungsten and/or vanadium additions for strengthening. The alloys have been fabricated, irradiated, tensile tested, and examined using transmission electron microscopy. The results demonstrate that low activation ferritic alloys are feasible. However, Fe-2.25Cr-V alloys are prone to carbide precipitation and irradiation hardening during irradiation at 420°C. Fe-2.25Cr-V and Fe-9Cr alloys are significantly weakened by irradiation at 585°C due to precipitate coarsening and dislocation recovery. The Fe-12Cr compositions appear to be the most interesting alloy class, showing negligible irradiation hardening at 420°C and only a moderate decrease in strength at 585°C.
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