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Role of transverse temperature gradients in the generation of lamellar eutectic solidification patterns / Mikaël Perrut in Acta materialia, Vol. 58 N° 5 (Mars 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 5 (Mars 2010) . - pp. 1761–1769 Titre : Role of transverse temperature gradients in the generation of lamellar eutectic solidification patterns Type de document : texte imprimé Auteurs : Mikaël Perrut, Auteur ; Andrea Parisi, Auteur ; Silvère Akamatsu, Auteur Année de publication : 2011 Article en page(s) : pp. 1761–1769 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Eutectic  solidification  Solidification  microstructure  Directional  solidification  Phase  field  modeling Résumé : In directional solidification, a sample is pulled in an externally imposed temperature gradient. When the pulling direction and the temperature gradient are not perfectly aligned, a transverse temperature gradient is generated in the sample. We investigate the dynamics of lamellar eutectic patterns, both by experimental observations and by numerical simulations, and find that it is dramatically affected by a transverse gradient. Whereas, in its absence, the labyrinth patterns that are formed in the initial stage of solidification persist over the entire duration of the experiments, a transverse temperature gradient induces a drift of the pattern which rapidly generates a regular array of lamellae. The drift speed is found to be consistently larger than expected from the normal growth hypothesis, both in simulations and experiments. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007976 [article] Role of transverse temperature gradients in the generation of lamellar eutectic solidification patterns [texte imprimé] / Mikaël Perrut, Auteur ; Andrea Parisi, Auteur ; Silvère Akamatsu, Auteur . - 2011 . - pp. 1761–1769. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 5 (Mars 2010) . - pp. 1761–1769 Mots-clés : Eutectic  solidification  Solidification  microstructure  Directional  solidification  Phase  field  modeling Résumé : In directional solidification, a sample is pulled in an externally imposed temperature gradient. When the pulling direction and the temperature gradient are not perfectly aligned, a transverse temperature gradient is generated in the sample. We investigate the dynamics of lamellar eutectic patterns, both by experimental observations and by numerical simulations, and find that it is dramatically affected by a transverse gradient. Whereas, in its absence, the labyrinth patterns that are formed in the initial stage of solidification persist over the entire duration of the experiments, a transverse temperature gradient induces a drift of the pattern which rapidly generates a regular array of lamellae. The drift speed is found to be consistently larger than expected from the normal growth hypothesis, both in simulations and experiments. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007976