Solute trapping in rapid solidification of a binary dilute system: A phase-field study

P. K. Galenko, E. V. Abramova, D. Jou, D. A. Danilov, V. G. Lebedev, D. M. Herlach

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Abstract

The phase-field model of Echebarria, Folch, Karma, and Plapp is extended to the case of rapid solidification in which local nonequilibrium phenomena occur in the bulk phases and within the diffuse solid-liquid interface. Such an extension leads to the fully hyperbolic system of equations given by the atomic diffusion equation and the phase-field equation of motion. This model is applied to the problem of solute trapping, which is accompanied by the entrapment of solute atoms beyond chemical equilibrium by a rapidly moving interface. The model predicts the beginning of complete solute trapping and diffusionless solidification at a finite solidification velocity equal to the diffusion speed in bulk liquid. © 2011 American Physical Society.
Original languageEnglish
Article number041143
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume84
DOIs
Publication statusPublished - 31 Oct 2011

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