1. Enhancement of vacancy diffusion by C and N interstitials in the equiatomic FeMnNiCoCr high entropy alloy.
- Author
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Lu, Eryang, Zhao, Junlei, Makkonen, Ilja, Mizohata, Kenichiro, Li, Zhiming, Hua, Mengyuan, Djurabekova, Flyura, and Tuomisto, Filip
- Subjects
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POSITRON annihilation , *ENTROPY , *ALLOYS , *DISTRIBUTION (Probability theory) - Abstract
We present evidence of homogenization of atomic diffusion properties caused by C and N interstitials in an equiatomic single-phase high entropy alloy (FeMnNiCoCr). This phenomenon is manifested by an unexpected interstitial-induced reduction and narrowing of the directly experimentally determined migration barrier distribution of mono-vacancy defects introduced by particle irradiation. Our observation by positron annihilation spectroscopy is explained by state-of-the-art theoretical calculations that predict preferential localization of C/N interstitials in regions rich in Mn and Cr, leading to a narrowing and reduction of the mono-vacancy size distribution in the random alloy. This phenomenon is likely to have a significant impact on the mechanical behavior under irradiation, as the local variations in elemental motion have a profound effect on the solute strengthening in high entropy alloys. [Display omitted] [ABSTRACT FROM AUTHOR]
- Published
- 2021
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