Abstract
TEM observations and hardness measurements were conducted on model Fe-25Ni-15Cr alloy irradiated in the Fast Flux Test Facility at 465°C to 0.42 dpa. Half of the alloys in both solution-annealed and cold-worked conditions were doped with isotope 59Ni to enhance the production rate of helium. Data showed that the production of dot clusters was suppressed at high He dpa ratio (62 appm/dpa). The cluster density was increased with dose for cold-worked alloys, while it was decreased in solution-annealed alloys. Hardness in solution-annealed alloys was mainly correlated to the density and size of the clusters, whereas hardness in cold-worked alloys was understood as a competitive process of softening by dislocation annihilation and hardening by cluster formation during irradiation.
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