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Zigzag diffusion paths in multiphase diffusion couples

Authors
Journal
Acta Metallurgica et Materialia
0956-7151
Publisher
Elsevier
Publication Date
Volume
42
Issue
11
Identifiers
DOI: 10.1016/0956-7151(94)90454-5

Abstract

Abstract The diffusion path in a multiphase diffusion couple is predicted to follow a zigzag course when the following conditions are met: the concentration differences between the diffusion couple alloys are small, the alloys contain the same phases, there is one more component in the alloys than the number of phases, and all diffusion takes place in one continuous phase that has a constant diffusivity. An analytical model for the general case of n components and p phases is given that consists of both Heaviside and error functions. The model is consistent with a proposal made by Roper and Whittle concerning “composite diffusion paths” in two-phase ternary systems.

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