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Structural damage and phase stability of cobalt-free FeCrNi medium-entropy alloy under high-fluence ion irradiation.
- Source :
-
Applied Surface Science . Jun2024, Vol. 657, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
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Abstract
- [Display omitted] • A cobalt-free fcc FeCrNi MEA was manufactured by powder metallurgy method. • The alloy maintains high structural stability even at a high irradiation fluence of 5 × 1016 Au ions/cm2. • The alloy shows excellent irradiation-hardening resistance. • Microstructural evolution under high-fluence irradiation was revealed by molecular dynamics simulation. A cobalt-free FeCrNi MEA was successfully synthesized and irradiated with 7.5 MeV Au ions at room temperature over a wide fluence from 5 × 1015 to 5 × 1016 Au ions/cm2. Microstructural characterization shows that the FeCrNi MEA exhibits low structural damage and high phase stability under high-fluence ion irradiation, and diffuse dislocations and defect clusters, especially dislocation loops and stacking-faults (SFs), are the main microstructural feature after irradiation. Limited elemental segregation at grain-boundaries and nanoscale Au clusters can be observed only in the specimen irradiated at the highest fluence. Meanwhile, void formation and phase instability are absent in any irradiation condition. Cascade-collision simulation reveals that large-size vacancy cluster collapses into the stacking fault tetrahedrons (SFTs) and abundant dislocation structures, especially the high-fraction movable Shockley dislocations at the high-energy ion irradiation, contributing to the absence of voids and the easily activated dislocation networks. Owing to these microstructural features, the irradiated specimens only exhibit a slight hardness increase (26 % at 210 dpa), indicating a superior resistance to irradiation hardening. Overall, this work supports that the FeCrNi MEA possesses an outstanding irradiation tolerance especially under high-fluence ion irradiation, thereby having good application prospects in the field of advanced nuclear reactors. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 657
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 176034071
- Full Text :
- https://doi.org/10.1016/j.apsusc.2024.159669