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

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

doi:10.1557/s43578-020-00071-8

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

Journal Article · Thu Feb 04 00:00:00 EST 2021 · Journal of Materials Research

DOI:https://doi.org/10.1557/s43578-020-00071-8· OSTI ID:1787316

^[1]; Zhong, Weicheng ^[1]; Jin, Ke ^[1]; Bei, Hongbin ^[1]; Osetsky, Yuri N. ^[1]; Zhang, Yanwen ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1787316

Journal Information:: Journal of Materials Research, Vol. 36, Issue 1; ISSN 0884-2914

Publisher:: Materials Research SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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