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Pseudo-binary and pseudo-ternary diffusion couple methods for estimation of the diffusion coefficients in multicomponent systems and high entropy alloys

Esakkiraja, N and Pandey, K and Dash, A and Paul, A (2019) Pseudo-binary and pseudo-ternary diffusion couple methods for estimation of the diffusion coefficients in multicomponent systems and high entropy alloys. In: Philosophical Magazine, 99 (18). pp. 2236-2264.

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Official URL: https://doi.org/10.1080/14786435.2019.1619027


The benefits of using the pseudo-binary and pseudo-ternary diffusion couple methods in multicomponent inhomogeneous systems are demonstrated by estimating different types of composition-dependent diffusion coefficients. These are important for understanding the basic atomic mechanism of diffusion and complex compositional evolutions. These were otherwise considered impossible during the last many decades. Without any options previously, sometimes the average values over a composition range of random choice were estimated, which are not the material constants but depend on the composition range and also the end member compositions. The steps and analyses for utilising the pseudo-binary and pseudo-ternary methods are first described in the Ni-Co-Fe-Mo system by producing the ideal diffusion profiles fulfilling the concepts behind these methods. Following, the discussion is extended to the systems related to medium (Ni-Co-Cr) and high (Ni-Co-Fe-Mn-Al) entropy alloys. In fact, this is the first report showing a correct experimental method that should be followed for the estimation of the interdiffusion and intrinsic diffusion coefficients in inhomogeneous high entropy alloys. In the end, the limitations of following these methods because of the generation of non-ideal diffusion profiles are discussed based on experimental results. The steps are also suggested to avoid such complications. These methods are easy to adopt for research engineers. Most importantly, these give an opportunity to validate the data estimated following newly proposed numerical methods by different groups with experimentally estimated diffusion coefficients, which were not possible earlier. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.

Item Type: Journal Article
Publication: Philosophical Magazine
Publisher: Taylor and Francis Ltd.
Additional Information: The copyright for this article belongs to Elsevier B.V.
Keywords: Aluminum alloys; Chromium alloys; Cobalt alloys; Entropy; High-entropy alloys; Iron alloys; Manganese alloys; Molybdenum alloys; Numerical methods; Ternary alloys, Composition ranges; Compositional evolution; Diffusion profiles; Experimental methods; Inhomogeneous system; Material constant; Multi-component systems; Research engineers, Diffusion
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 06 Jan 2023 05:20
Last Modified: 06 Jan 2023 05:20
URI: https://eprints.iisc.ac.in/id/eprint/78801

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