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Type: Artigo de periódico
Title: The application of computational thermodynamics and a numerical model for the determination of surface tension and Gibbs-Thomson coefficient of aluminum based alloys
Author: Jacome, PAD
Landim, MC
Garcia, A
Furtado, AF
Ferreira, IL
Abstract: In this paper, a solution for Butler's formulation is presented permitting the surface tension and the Gibbs-Thomson coefficient of Al-based binary alloys to be determined. The importance of Gibbs-Thomson coefficient for binary alloys is related to the reliability of predictions furnished by predictive cellular and dendritic growth models and of numerical computations of solidification thermal variables, which will be strongly dependent on the thermophysical properties assumed for the calculations. A numerical model based on Powell hybrid algorithm and a finite difference Jacobian approximation was coupled to a specific interface of a computational thermodynamics software in order to assess the excess Gibbs energy of the liquid phase, permitting the surface tension and Gibbs-Thomson coefficient for Al-Fe, Al-Ni, Al-Cu and Al-Si hypoeutectic alloys to be calculated. The computed results are presented as a function of the alloy composition. (C) 2011 Elsevier B.V. All rights reserved.
Subject: Numerical modeling
Aluminum alloys
Thermophysical properties
Country: Holanda
Editor: Elsevier Science Bv
Citation: Thermochimica Acta. Elsevier Science Bv, v. 523, n. 41671, n. 142, n. 149, 2011.
Rights: fechado
Identifier DOI: 10.1016/j.tca.2011.05.015
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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