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Tracer diffusion under a concentration gradient: A pathway for a consistent development of mobility databases in multicomponent alloys

Gaertner, D and Kundin, J and Esakkiraja, N and Berndt, J and Durand, A and Kottke, J and Klemme, S and Laplanche, G and Eggeler, G and Wilde, G and Paul, A and Steinbach, I and Divinski, SV (2023) Tracer diffusion under a concentration gradient: A pathway for a consistent development of mobility databases in multicomponent alloys. In: Journal of Alloys and Compounds, 930 .

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Official URL: https://doi.org/10.1016/j.jallcom.2022.167301


Diffusion in the CoCrFeMnNi high-entropy alloy is investigated using an augmented tracer / interdiffusion couple approach. The tracer diffusion coefficients are measured along the diffusion path developed between the Co17Cr20Fe20Mn20Ni23 and Co23Cr20Fe20Mn20Ni17 end-members allowing an elaboration of a consistent composition-dependent diffusion database. Both tracer and chemical concentration profiles are successfully reproduced to a tolerable level using a pair-diffusion model avoiding the reference element concept. Up-hill diffusion of Co in the experimental profile is not reproduced by the existing kinetic and thermodynamic databases. The reasons for this mismatch are discussed. The calculation of intrinsic and interdiffusion coefficients from the estimated tracer diffusion coefficients utilizing the thermodynamic parameters is demonstrated. The calculated values of the interdiffusion coefficients produced a reasonable match with the interdiffusion flux profiles developed in the multicomponent diffusion couple. The calculation of the vacancy wind effect indicates its strong influence on several intrinsic cross diffusion coefficients.

Item Type: Journal Article
Publication: Journal of Alloys and Compounds
Publisher: Elsevier Ltd
Additional Information: The copyright for this article belongs to the Author(s).
Keywords: Chromium alloys; Cobalt alloys; Database systems; Diffusion; Iron alloys, Concentration- gradients; Diffusion model; Diffusion paths; High entropy alloys; Interdiffusion; Interdiffusion coefficients; Multi-component alloy; Pair-wise diffusion model; Tracer diffusion; Tracer diffusion coefficients, Manganese alloys
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 14 Nov 2022 05:48
Last Modified: 14 Nov 2022 05:48
URI: https://eprints.iisc.ac.in/id/eprint/77755

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