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Role of transverse temperature gradients in the generation of lamellar eutectic solidification patterns

Perrut, Mikaël and Parisi, Andrea and Akamatsu, Silvère and Bottin-Rousseau, Sabine and Faivre, Gabriel and Plapp, Mathis (2010) Role of transverse temperature gradients in the generation of lamellar eutectic solidification patterns. Acta Materialia, 58 (5). pp. 1761-1769. ISSN 1359-6454

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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.

Item Type: Journal Article
Journal or Publication Title: Acta Materialia
Uncontrolled Keywords: Directional solidification ; Eutectic solidification ; Phase field modeling ; Solidification microstructure
Subjects:
Departments: Faculty of Health and Medicine > Medicine
ID Code: 124919
Deposited By: ep_importer_pure
Deposited On: 27 Apr 2018 10:04
Refereed?: Yes
Published?: Published
Last Modified: 15 Nov 2018 00:42
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/124919

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