Abstract
The irradiation behavior of a NiMoCrFe alloy, of the type currently being considered for use in future molten salt cooled reactors, has been investigated in situ using 1MeV Kr ions at temperatures of 723 and 973K. When irradiated to 5 dpa, experimental observations reveal the instantaneous formation and annihilation of point defect clusters, with such processes attributed to the long range elastic interactions that occur between defects through multiple intra-cascade overlap. Corresponding differences in the defect cluster density and size distribution suggest that changes to the microstructure were dependent upon temperature and dose, affecting the growth, accumulation and mobility of irradiationinduced defect clusters under these conditions. [doi:10.2320/matertrans.MD201311]
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