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Phase-field modeling of solute trapping: comparative analysis of parabolic and hyperbolic models.

Lebedev, Vladimir and Abramova, Ekaterina and Danilov, Denis and Galenko, Peter (2010) Phase-field modeling of solute trapping: comparative analysis of parabolic and hyperbolic models. International Journal of Materials Research, 101 (4), pp. 473-479.

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Abstract

The phase-field model of Wheeler, Boettinger and McFadden is extended to the case of fast solidification in which local non-equilibrium phenomena occur in the bulk phases and within the diffuse solid–liquid interface. Such an extension leads to the characteristic diffusion speeds of atoms (both within the diffuse interface and inside the bulk phases) and to the speed of the interface propagation. As a result, the model is described by a system of hyperbolic equations for the atomic diffusion transport as well as for the phase-field. 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.

Document Type:Article
Title:Phase-field modeling of solute trapping: comparative analysis of parabolic and hyperbolic models.
Authors:
AuthorsInstitution or Email of Authors
Lebedev, VladimirUdmurt Ste University, Izhevsk
Abramova, EkaterinaICAMS Bochum
Danilov, DenisKIT Karlsruhe
Galenko, Peterpeter.galenko@dlr.de
Date:2010
Journal or Publication Title:International Journal of Materials Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:101
Page Range:pp. 473-479
Status:Published
Keywords:Undercooling of Materials
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialwissenschaftliche Forschung
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Dieter Herlach
Deposited On:28 Jul 2011 14:56
Last Modified:26 Mar 2013 13:30

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