|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Enhanced Irradiation Resistance Through Phase Transformation in NiFeCoCrCu HEA Film
||Li Jiang, Yuan Peng Xiu, Wen Yan Zhang, Min Lu Wang
|On-Site Speaker (Planned)
Nanocrystalline high entropy alloy (HEA) film with the composition of NiFeCoCrCu was irradiated by 3 MeV Ni ions to fluences of 4.7 × 1014, 2.8 × 1015, 1.5 × 1016, 8.0 × 1016 and 2.4 × 1017 cm-2 respectively, reaching a peak dose over 600 dpa. Microstructure analysis results reveal that a high density of nanotwins with an average thickness of 1.1 nm exist in the as-deposited film. After irradiation, FCC phase partially transforms into BCC phase, and no obvious radiation damage can be observed. Besides the large amount of grain boundaries in the HEA film, the phase boundaries also serve to effectively alleviate radiation damage by acting as defect sinks. Over all, our results not only present a promising candidate for nuclear material, but also provide science-based design and optimization of radiation-tolerant HEAs by introducing high-density nano-sized phase transformation.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume