Neutron Irradiation Embrittlement in Fe-Based Model Alloys Studied by Magnetic Hysteresis Measurements

摘要

Effects of neutron irradiation on magnetic hysteresis loops have been studied in pure Fe, Fe-1wt% Mn, Fe-0.9wt% Cu, and Fe-0.9wt% Cu-lwt% Mn model alloys, which were irradiated at 290°C to a fluence of 3.32 × 1019 n/cm~2. Minor-loop coefficients which are obtained from scaling relations between minor-loop parameters and are indicators of internal stress, decrease in all model alloys. The decrease of the coefficients is larger for alloys including Cu and is enhanced by lwt% Mn addition. These changes are inversely proportional to yield stress changes. The results were qualitatively explained on the basis of nanoscale features of irradiation defects and were compared with our previous results of Fe-Cu-Mn-Ni model alloys.