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SynopsisThe interaction between solute atoms and radiation induced defects was studied by means of tensile test and transmission electron microscopy. The defects were produced by neutron irradiation at 473 K to a fluence of 6.4 x 1022 of m2 (E n> 1 MeV) and electron irradiation at 650 kV electron microscope to a fluence of 7 x 1025 of m2.Radiation hardening and radiation embrittlement occurred by neutron irradiation. The yield stress increased and the total elongation decreased with the increase of manganese content. Dislocation loops were observed in the i ron but not detected in manganese alloys. Therefore, it will be considered that the defects would be trapped by manganese atoms and then formed complexes with carbon. Defects produced by electron irradiation were not observed by electron microscopy in the manganese alloys, however, after annealing above 598 K the defect clusters, presumably interstitial type, appeared and grew. The annealing behaviors were similar for both the neutron and electron irradiated specimens.The radiation hardening could be explained by the mechanism in which manganese atoms trap carbon and interstitial atoms during irradiation and then form fine complexes, which would act as the obstacles for dislocation motion.