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Jou D, Galenko PK. Coarse-graining for fast dynamics of order parameters in the phase-field model. Philos Trans A Math Phys Eng Sci. 2018;376(2113)doi: 10.1098/rsta.2017.0203.
Jou, D., & Galenko, P. K. (2018). Coarse-graining for fast dynamics of order parameters in the phase-field model. Philosophical transactions. Series A, Mathematical, physical, and engineering sciences, 376(2113), . https://doi.org/10.1098/rsta.2017.0203
Jou, D, and Galenko, P K. "Coarse-graining for fast dynamics of order parameters in the phase-field model." Philosophical transactions. Series A, Mathematical, physical, and engineering sciences vol. 376,2113 (2018). doi: https://doi.org/10.1098/rsta.2017.0203
Jou D, Galenko PK. Coarse-graining for fast dynamics of order parameters in the phase-field model. Philos Trans A Math Phys Eng Sci. 2018 Feb 28;376(2113). doi: 10.1098/rsta.2017.0203. PMID: 29311202; PMCID: PMC5784094.
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Philos Trans A Math Phys Eng Sci. 2018 Feb 28;376(2113). doi: 10.1098/rsta.2017.0203.

Coarse-graining for fast dynamics of order parameters in the phase-field model.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

D Jou, P K Galenko

Affiliations

  1. Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia, Spain [email protected].
  2. Physikalisch-Astronomische Fakultät, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany.

PMID: 29311202 PMCID: PMC5784094 DOI: 10.1098/rsta.2017.0203

Abstract

In standard descriptions, the master equation can be obtained by coarse-graining with the application of the hypothesis of full local thermalization that is equivalent to the local thermodynamic equilibrium. By contrast, fast transformations proceed in the absence of local equilibrium and the master equation must be obtained with the absence of thermalization. In the present work, a non-Markovian master equation leading, in specific cases of relaxation to local thermodynamic equilibrium, to hyperbolic evolution equations for a binary alloy, is derived for a system with two order parameters. One of them is a conserved order parameter related to the atomistic composition, and the other one is a non-conserved order parameter, which is related to phase field. A microscopic basis for phenomenological phase-field models of fast phase transitions, when the transition is so fast that there is not sufficient time to achieve local thermalization between two successive elementary processes in the system, is provided. In a particular case, when the relaxation to local thermalization proceeds by the exponential law, the obtained coarse-grained equations are related to the hyperbolic phase-field model. The solution of the model equations is obtained to demonstrate non-equilibrium phenomenon of solute trapping which appears in rapid growth of dendritic crystals.This article is part of the theme issue 'From atomistic interfaces to dendritic patterns'.

© 2018 The Author(s).

Keywords: coarse-graining; fast transition; phase-field model

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