Diffusion-mediated chemical concentration variation and void evolution in ion-irradiated NiCoFeCr high-entropy alloy

Zhe Fan*, Weicheng Zhong, Ke Jin, Hongbin Bei, Yuri N. Osetsky, Yanwen Zhang

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

5 引用 (Scopus)

摘要

High-entropy alloys (HEAs) are proposed as potential structural materials for advanced nuclear systems, but little is known about the response of matrix chemistry in HEAs upon irradiation. Here, we reveal a substantial change of matrix chemical concentration as a function of irradiation damage (depth) in equiatomic NiCoFeCr HEA irradiated by 3 MeV Ni ions. After ion irradiation, the matrix contains more Fe/Cr in depth shallower than ∼900-1000 nm but more Ni/Co from ∼900-1000 nm to the end of the ion-damaged region due to the preferential diffusion of vacancies through Fe/Cr. Preferential diffusion also facilitates migration of vacancies from high radiation damage region to low radiation damage region, leading to no void formation below ∼900-1000 nm and void formation around the end of the ion-damaged region at a fluence of 5 × 1016 cm-2 (∼123 dpa, displacements per atom, peak dose under full cascade mode). As voids grow significantly at an increased fluence (8 × 1016 cm-2, 196 dpa), the matrix concentration does not change dramatically due to new voids formed below ∼900-1000 nm.

源语言英语
页(从-至)1-13
页数13
期刊Journal of Materials Research
DOI
出版状态已接受/待刊 - 2020
已对外发布

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Fan, Z., Zhong, W., Jin, K., Bei, H., Osetsky, Y. N., & Zhang, Y. (已接受/印刷中). Diffusion-mediated chemical concentration variation and void evolution in ion-irradiated NiCoFeCr high-entropy alloy. Journal of Materials Research, 1-13. https://doi.org/10.1557/jmr.2020.262