Role of transverse temperature gradients in the generation of lamellar eutectic solidification patterns |
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Authors: | Mikaël Perrut Andrea Parisi Silvère Akamatsu Sabine Bottin-Rousseau Gabriel Faivre Mathis Plapp |
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Affiliation: | 1. Institut des Nanosciences de Paris, CNRS UMR 7588, Université Pierre-et-Marie-Curie, Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France;2. CNRS-CEA, IRAMIS, Laboratoire Léon Brillouin, F-91191 Gif-sur-Yvette, France;3. Centro de Física Teórica e Computacional, Complexo Interdisciplinar da Universidade de Lisboa, Av. Prof. Gama Pinto 2, 1649-003 Lisboa, Portugal;4. Physique de la Matière Condensée, École Polytechnique, CNRS, 91128 Palaiseau, France |
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Abstract: | 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. |
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