Anomalous behaviour of the previously irradiated Fe₃Al alloy at phase transitions

Results are summarized of X-ray investigations of the ordered Fe3Al alloy structure change after neutron irradiation (E>0.1 MeV) by 2 × 1023 and 5 × 1023 n m−2 fluences and during post-radiation annealing. It was found that the process of Fe3Al alloy radiation disordering at neutron irradiation is accompanied by production of submicroregions enriched and impoverished by Al. While heating the previously irradiated alloy the newly formed submicroregions serve like nuclei to form new BCC phases unknown earlier which have been enriched and impoverished by Al. Anomalies have been found in the process of high-temperature phase transitions on heating previously irradiated alloy samples versus non-irradiated ones. It has been shown that the previous alloy irradiation results in the significant decrease of critical temperature of its “order-disorder” phase transition.

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