A new approach for analysing interdiffusion in multicomponent alloys
Date
2021
Authors
Belova, I.V.
Afikuzzaman, M.
Murch, G.E.
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Journal article
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Scripta Materialia, 2021; 204:114143-1-114143-5
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Irina V. Belova, Mohammad Afikuzzaman, Graeme E. Murch
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Abstract
Analysis of interdiffusion in multicomponent alloys is addressed by developing a new and elegant math- ematical approach that is based on the fitting of composition profiles into a closed-form solution where interdiffusion coefficients are independent of composition. As examples, ternary metallic systems are analysed using one and two diffusion couples with the full set of interdiffusion coefficients being de- termined. Overall, the new fitting method gives excellent outcomes and allows the probing of multiple solutions (validated by back-testing) that exist when a single diffusion couple is used in multicomponent ( > 2) systems. Important findings of the present investigation show that small differences in composition profiles may lead to large differences in the interdiffusion coefficients. In addition, the newly developed approach is successfully applied to experimental results for the Cu-Ni-Zn alloys annealed at 775 °C for 48 h.
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©2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.