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A microscopic model for solidification

Conti, M ; Marconi, U. Marini Bettolo ; Crisanti, A

Europhysics letters, 1999-08, Vol.47 (3), p.338-344 [Periódico revisado por pares]

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Título:
A microscopic model for solidification
Autor: Conti, M ; Marconi, U. Marini Bettolo ; Crisanti, A
Assuntos: 64.60.-i ; 64.60.Cn
É parte de: Europhysics letters, 1999-08, Vol.47 (3), p.338-344
Notas: istex:B3A63C1BBCF0E7DE58D078014811EA09EE3B80D4
publisher-ID:47310
ark:/67375/80W-XVRJSXRQ-4
Descrição: We present a novel picture of a non-isothermal solidification process starting from a molecular level, where the microscopic origin of the basic mechanisms and of the instabilities characterizing the approach to equilibrium is rendered more apparent than in existing approaches based on coarse-grained free-energy functionals à la Landau. The system is composed of a lattice of Potts spins, which change their state according to the stochastic dynamics proposed some time ago by Creutz. Such a method is extended to include the presence of latent heat and thermal conduction. Not only the model agrees with previous continuum treatments, but it allows to introduce in a consistent fashion the microscopic stochastic fluctuations. These play an important role in nucleating the growing solid phase in the melt. The approach is also very satisfactory from the quantitative point of view since the relevant growth regimes are fully characterized in terms of scaling exponents.
Editor: IOP Publishing
Idioma: Inglês

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