期刊
JOURNAL OF NUCLEAR MATERIALS
卷 548, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jnucmat.2021.152807
关键词
electron microscopy; atom probe tomography; ion irradiation; solute effect; radiation-induced segregation/precipitation
资金
- ANR [ANR-10-EQPX-37]
- French Network EMIR
- SOTERIA (Safe long-term operation of light water reactors based on improved understanding of radiation effects in nuclear structural materials)
- 'defiNEEDS' (CNRS-CEA-EDF-ANDRA-AREVA-IRSN-BRGM) within the project SAFETY
- GENESIS EQUIPEX Program [PIA, ANR] [ANR-11-EQPX-0020]
- GENESIS EQUIPEX Program [Normandie region]
The effects of Mn and Ni on microstructure evolution under irradiation in Fe-based alloys were investigated. Irradiation promoted the formation of dislocation loops in both FeNi and FeMn alloys. Radiation-induced segregation and precipitation of a FCC phase were observed in FeNi alloy, while highly enriched decorated dislocation loops with a higher Mn segregation were observed in FeMn alloy.
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 was revealed, highly enriched decorated dislocation loops are observed, with a higher Mn segregation at radiation defects than Ni. (C) 2021 Elsevier B.V. All rights reserved.
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