Studies of “sluggish diffusion” effect in Co-Cr-Fe-Mn-Ni, Co-Cr-Fe-Ni and Co-Fe-Mn-Ni high entropy alloys; determination of tracer diffusivities by combinatorial approach

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

Abstract

Experimental and theoretical studies of diffusion in quinary Co-Cr-Fe-Mn-Ni and quaternary Co-Cr-Fe-Ni and Co-Fe-Mn-Ni FCC-structured high entropy alloys were performed. The diffusion couples, with thorium dioxide markers placed at initial joint positions, were annealed at temperature of 1350 K for 72 or 73 h. The concentration profiles obtained from the quinary system were used to determine tracer diffusivities of all components, by using a combinatorial approach, i.e. the Darken method with thermodynamic description provided by Miedema's scheme combined with the optimization method. The results showed good qualitative agreement with the tracer data from radiotracer experiments. The calculated thermodynamic factor, ranged from tens to hundreds of %, show importance of mixing enthalpy on interdiffusion kinetics. The values determined for 5-component system were then used a priori to simulate the concentration profiles for 4-component ones, showing very good agreement with the experimental data. The results indicate that change of components number did not influence the diffusion kinetics in the investigated systems and do not support existence of the sluggish diffusion effect.
Author W. Kucza
W. Kucza,,
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, Juliusz Dąbrowa - AGH University of Science and Technology (AGH)
Juliusz Dąbrowa,,
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, Grzegorz Cieślak ZMKF
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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, Tadeusz Kulik ZMKF
Tadeusz Kulik,,
- Division of Construction and Functional Materials
, Marek Danielewski - Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie (AGH)
Marek Danielewski,,
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Journal seriesJournal of Alloys and Compounds, ISSN 0925-8388
Issue year2018
Vol731
Pages920-928
Publication size in sheets0.5
Keywords in PolishMetale i ich stopy, Dyfuzja, Właściwości termodynamiczne, Modelowanie komputerowe
Keywords in EnglishMetals and alloys, Diffusion, Thermodynamic properties, Computer simulations
DOIDOI:10.1016/j.jallcom.2017.10.108
URL http://www.sciencedirect.com/science/article/pii/S0925838817335442#kwrds0010
Languageen angielski
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Studies of “sluggish diffusion”.pdf 1.84 MB
Score (nominal)35
ScoreMinisterial score [Punktacja MNiSW] = 35.0, 13-12-2017, ArticleFromJournal
Ministerial score (2013-2016) [Punktacja MNiSW (2013-2016)] = 35.0, 13-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor [Impact Factor WoS]: 2016 = 3.133 (2) - 2016=2.919 (5)
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