Determination of Average Ternary Interdiffusion Coefficients Using Moments of Interdiffusion Flux and Concentration Profiles

Abstract:

We developed a method of rigorous solution of the Onsager’s flow equations using moments of the interdiffusion-parameter integrands for the determination of average ternary interdiffusion coefficients. The analysis developed by Dayananda and Sohn [1] is the basis for this refined approach. Average main and cross interdiffusion coefficients are determined over selected regions in the diffusion zone using the diffusion-distance moments of the interdiffusion flux flow equations. Thermodynamic stability of solid solutions in the light of interdiffusion phenomenon is taken as validation criteria to identify accurate and reliable values of the ternary interdiffusion coefficients. Regulations are proposed for successful application of the analysis method to various ternary diffusion couples in Ni- and Fe-based intermetallics.

• Periodical: Defect and Diffusion Forum (Volumes 297-301)
• Pages: 1328-1333
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.297-301.1328
• Online since: April 2010
• Authors: N. Garimella, H.J. Choi, Yong Ho Sohn
• Keywords: Diffusion Couple, Interdiffusion Coefficient, Ternary Alloy

References

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