The purpose was to investigate the secondary defects distribution to test the influence of the irradiation mode on the microstructure in Eurofer97 and a model alloy (Fe–9 wt% Cr). Two modes were experimented at the same damage (3 dpa) at 350 and 550C. The first was a long-time continuous irradiation and the second was a short-time irradiation. The materials studied were irradiated by krypton ions. The first step consists in qualitative characterization of the secondary defects. Post irradiation in situ annealing experiments show that accumulated defects condense at temperature higher than 550C in Eurofer. In the investigated conditions, the irradiation mode does not induce a major difference: the morphologies, sizes and densities of loops were quite similar.

Dislocation Loops in Eurofer and a Fe–Cr Alloy Irradiated by Ions at 350 and 550C at 3dpa - Effect of Dose Rate. L.Boulanger, Y.Serruys: Journal of Nuclear Materials, 2009, 386-388, 441-4