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Evolution of specific surface area with solid fraction during solidification / L. Ratke in Acta materialia, Vol. 58 N° 12 (Juillet 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4207–4211 Titre : Evolution of specific surface area with solid fraction during solidification Type de document : texte imprimé Auteurs : L. Ratke, Auteur ; A. Genau, Auteur Année de publication : 2011 Article en page(s) : pp. 4207–4211 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Fraction  solid  Specific  surface  area  Growth  Coalescence Résumé : The specific surface area varies with solid fraction during phase transformation from liquid to solid. The few measurements available show a non-linear dependence of the specific surface area on the solid fraction, with an initial increase as the amount of solid increases, followed by a decrease as the system moves toward complete transformation. We derive a simple model for this behaviour assuming a combination of growth and coalescence. We obtain a relation exhibiting an increase with the square root of fraction solid at low volume fractions, independent of a growth law, and a decrease at higher volume fractions which depends on the model chosen to describe the coalescence of dendrites. By choosing an appropriate constant, the model accurately describes recent data presented by Limodin and co-workers. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002181 [article] Evolution of specific surface area with solid fraction during solidification [texte imprimé] / L. Ratke, Auteur ; A. Genau, Auteur . - 2011 . - pp. 4207–4211. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4207–4211 Mots-clés : Fraction  solid  Specific  surface  area  Growth  Coalescence Résumé : The specific surface area varies with solid fraction during phase transformation from liquid to solid. The few measurements available show a non-linear dependence of the specific surface area on the solid fraction, with an initial increase as the amount of solid increases, followed by a decrease as the system moves toward complete transformation. We derive a simple model for this behaviour assuming a combination of growth and coalescence. We obtain a relation exhibiting an increase with the square root of fraction solid at low volume fractions, independent of a growth law, and a decrease at higher volume fractions which depends on the model chosen to describe the coalescence of dendrites. By choosing an appropriate constant, the model accurately describes recent data presented by Limodin and co-workers. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002181