Radiation-induced segregation/precipitation in Fe-Ni and Fe-Mn model alloys: Dose rate and solute effects

L.T. Belkacemi-Rebrab (1) , E. Meslin (1) , J-P. Crocombette (1) , Bertrand Radiguet (2) , F. Leprêtre (3) , B. Decamps (4)

1 SRMP - Service de recherches de métallurgie physique
2 GPM - Groupe de physique des matériaux
3 Lab JANNUS
4 IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

The evolution of radiation damage in steels is a major issue for the safe operation of Nuclear Power Plants. Mn and Ni contribution to the formation and evolution of microstructural features remains a controversial issue. The present study aims at investigating their effects on microstructure by irradiating undersaturated BCC Fe-3.3at.%Ni and Fe-2.8at.%Mn model alloys. Two different ion irradiation conditions have been applied to study the effect of irradiation dose rate in both of these Fe-based alloys at a temperature of 673 K. In all cases, irradiation promotes the formation of dislocation loops. In the FeNi alloy, radiation-induced segregation is observed on loops, leading to precipitation of a FCC phase in the low dose rate irradiation condition only. In the case of FeMn, even if no precipitation occurred, highly enriched decorated dislocation loops are observed, leading to a higher Mn segregation at radiation defects than Ni.

Mots clés: electron microscopy; atom probe tomography; ion irradiation; solute effect; radiation-induced segregation/precipitation

Domaines: Science des matériaux [cond-mat.mtrl-sci]

L.T. Belkacemi-Rebrab, E. Meslin, J-P. Crocombette, Bertrand Radiguet, F. Leprêtre, et al.. Radiation-induced segregation/precipitation in Fe-Ni and Fe-Mn model alloys: Dose rate and solute effects. Journal of Nuclear Materials, 2021, 548, pp.152807. ⟨10.1016/j.jnucmat.2021.152807⟩. ⟨hal-03127358⟩