Demystifying the sluggish diffusion effect in high entropy alloys

Juliusz Dąbrowa , Marek Zajusz , W. Kucza , Grzegorz Cieślak , Katarzyna Berent , T. Czeppe , Tadeusz Kulik , Marek Danielewski

Abstract

Interdiffusion studies in Co-Cr-Fe-Mn-Ni, Co-Fe-Mn-Ni, Co-Cr-Fe-Ni, and Co-Cr-Mn-Ni, as well as a reevaluation of the previous results obtained for Al-Co-Cr-Fe-Ni, were conducted. In the experimental part, diffusion couples were annealed at four different temperatures: 1230, 1270, 1310 and 1350 K for each system. Then, the results were evaluated with use of the optimization-based technique, combined with the Miedema's thermodynamic description, what allowed obtaining of tracer diffusion coefficients for all elements in all considered systems. The correctness of the applied approach was tested on the example of Co-Cr-Fe-Mn-Ni system, showing very good agreement of determined tracer diffusivities with the values obtained by other authors. Obtained values of diffusivities were compared with the available data for a number of conventional binary and ternary systems. No signs of diffusion retardation were observed in the absolute temperature scale. In the case of temperature scale normalized with respect to the melting point, an abnormal behavior, previously attributed to the HEAs' sluggish diffusion effect was observed. However, it occurred only for alloys with prominent manganese content and was completely independent of the number of components, being just as likely to occur in binary systems as in HEAs. Therefore, the alleged sluggishness of diffusion in HEAs should be treated just as a result of specific compositions of the previously studied alloys and cannot be generalized for all high entropy systems.
Author Juliusz Dąbrowa - AGH University of Science and Technology (AGH)
Juliusz Dąbrowa,,
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, Marek Zajusz
Marek Zajusz,,
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, W. Kucza
W. Kucza,,
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, Grzegorz Cieślak (FMSE / DCFM)
Grzegorz Cieślak,,
- Division of Construction and Functional Materials
, Katarzyna Berent - Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie (AGH)
Katarzyna Berent,,
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, T. Czeppe
T. Czeppe,,
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, Tadeusz Kulik (FMSE / DCFM)
Tadeusz Kulik,,
- Division of Construction and Functional Materials
, Marek Danielewski - AGH University of Science and Technology (AGH)
Marek Danielewski,,
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Journal seriesJournal of Alloys and Compounds, ISSN 0925-8388, (N/A 100 pkt)
Issue year2019
Vol783
Pages193-207
Publication size in sheets0.7
Keywords in EnglishHigh entropy alloys, Diffusion, Computer simulations, Thermodynamic modeling
ASJC Classification2505 Materials Chemistry; 2506 Metals and Alloys; 2210 Mechanical Engineering; 2211 Mechanics of Materials
DOIDOI:10.1016/j.jallcom.2018.12.300
URL https://www.sciencedirect.com/science/article/pii/S0925838818348576?via%3Dihub
Languageen angielski
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Demystifying the sluggish diffusion effect in high entropy alloys.pdf 3.34 MB
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 20-10-2019, ArticleFromJournal
Publication indicators WoS Citations = 5; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.321; WoS Impact Factor: 2017 = 3.779 (2) - 2017=3.315 (5)
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