Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 510, Issue -, Pages 187-192Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2018.08.006
Keywords
High-entropy alloy; Helium bubbles; Faulted dislocation loops; Stacking fault energy
Funding
- Hong Kong Research Grant Council (RGC) [CityU 11212915]
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In the He+ irradiated FeCoNiCrTi0.2 high-entropy alloy (HEA), radiation-induced defects including helium bubbles and faulted dislocation loops were characterized by transmission electron microscopy. Compared with other face-centered cubic alloys irradiated in similar conditions, we found that the faulted loops in the FeCoNiCrTi0.2 HEA have a much large size, whereas the perfect loops were rarely detected. Our results reveal that the faulted-type defect structure is more energetically favorable in the FeCoNiCrTi0.2 HEA, whereas the transformation of the faulted to perfect dislocation loops was suppressed. For the underlying mechanism, we propose that the low stacking fault energy can stabilize the faulted planar defects during irradiation. (C) 2018 Elsevier B.V. All rights reserved.
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