This article is cited in 2 papers

Metals

Spinodal decomposition of an alloy with a strong concentration dependence of the mutual diffusion coefficient

I. K. Razumov

Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia

Abstract: It is shown that the kinetics of decomposition of an alloy with a strong concentration dependence of the mutual diffusion coefficient is qualitatively different from the widely known kinetics of spinodal decomposition, since it includes the formation of metastable (in the kinetic sense) precipitates of the intermediate composition. Concentration dependence of the mutual diffusion coefficient is particularly due to the difference in impurity diffusion coefficients, as well as component self-diffusion coefficients, and it increases as temperature decreases. The calculations use an expression for the flow of component atoms in the absence of the substance flow, obtained previously under the kinetic theory of vacancy diffusion (“hole gas method”).

Keywords: spinodal decomposition, mutual diffusion coefficient, precipitates of intermediate composition.

Received: 15.06.2021
Revised: 15.06.2021
Accepted: 09.09.2021

DOI: 10.21883/FTT.2022.01.51826.143

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