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  Enhancement of vacancy diffusion by C and N interstitials in the equiatomic FeMnNiCoCr high entropy alloy

Lu, E., Zhao, J., Makkonen, I., Mizohata, K., Li, Z., Hua, M., et al. (2021). Enhancement of vacancy diffusion by C and N interstitials in the equiatomic FeMnNiCoCr high entropy alloy. Acta Materialia, 215: 117093. doi:10.1016/j.actamat.2021.117093.

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Enhancement of vacancy diffusion by C and N interstitials in the equiatomic FeMnNiCoCr high entropy alloy _ Elsevier Enhanced Reader.pdf (Publisher version), 6MB
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Enhancement of vacancy diffusion by C and N interstitials in the equiatomic FeMnNiCoCr high entropy alloy _ Elsevier Enhanced Reader.pdf
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2021
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The Authors. Published by Elsevier Ltd on behalf of Acta Materialia Inc.

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 Creators:
Lu, Eryang1, 2, Author              
Zhao, Junlei3, Author
Makkonen, Ilja1, 4, Author              
Mizohata, Kenichiro1, 2, Author              
Li, Zhiming5, 6, Author              
Hua, Mengyuan3, Author
Djurabekova, Flyura1, 4, Author
Tuomisto, Filip1, 4, Author              
Affiliations:
1Department of Physics, University of Helsinki, P.O. Box 43, FI-00014 Helsinki, Finland, ou_persistent22              
2Helsinki Institute of Physics, University of Helsinki, P.O. Box 43, FI-00014, Helsinki, Finland, ou_persistent22              
3Department of Electrical and Electronic Engineering, Southern University of Science and Technology, 518055 Shenzhen, China, ou_persistent22              
4Helsinki Institute of Physics, P.O. Box 64, FI-00014 Helsinki, Finland, ou_persistent22              
5High-Entropy Alloys, Project Groups, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_3010672              
6School of Materials Science and Engineering, Central South University, Changsha 410083, China, ou_persistent22              

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Free keywords: Chromium alloys; Chromium metallography; Cobalt alloys; Cobalt metallography; Entropy; High-entropy alloys; Iron alloys; Iron metallography; Irradiation; Manganese alloys; Nickel metallography; Positron annihilation spectroscopy, Atomic diffusions; Mechanical behavior; Migration barriers; Particle irradiation; Preferential localization; Solute strengthening; Theoretical calculations; Vacancy diffusion, Manganese metallography
 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. © 2021

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 Dates: 2021-08-15
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1016/j.actamat.2021.117093
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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
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Publ. Info: Kidlington : Elsevier Science
Pages: - Volume / Issue: 215 Sequence Number: 117093 Start / End Page: - Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100