Abstract
A phenomenological mathematical model of the formation and growth of phases in a binary multiphase system with allowance for factors influencing the process of diffusion in a binary system is presented. It is shown that phases can grow for a certain time at different ratios between diffusion parameters according to a parabolic law that depends on the duration of isothermic annealing. They then slow their growth after successor phases appear at their interface with one component and can completely disappear from a diffusion layer or begin to grow again, but only at a rate slower than during their initial formation. The dependence of the thickness of each phase layer in a multiphase diffusion zone on the duration of isothermic annealing and the ratio between the diffusion parameters in neighboring phases is obtained. It is established that a certain ratio between the phase growth and rates of dissolution with allowance for the coefficients of diffusion in each phase and the periods of incubation can result in the complete disappearance of one phase as early as the onset of the growth of phase nuclei and be interpreted as a process of reaction diffusion.
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Original Russian Text © L.A. Molokhina, V.E. Rogalin, S.A. Filin, I.A. Kaplunov, 2017, published in Zhurnal Fizicheskoi Khimii, 2017, Vol. 91, No. 9, pp. 1468–1475.
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Molokhina, L.A., Rogalin, V.E., Filin, S.A. et al. Mathematical model for the growth of phases in binary multiphase systems upon isothermic annealing. Russ. J. Phys. Chem. 91, 1635–1641 (2017). https://doi.org/10.1134/S0036024417090217
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DOI: https://doi.org/10.1134/S0036024417090217