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Hexagonal eutectic solidification patterns operating near a marginal stability point

Abstract : We study the long-time dynamics of hexagonal directional-solidification patterns in bulk samples of a transparent eutectic alloy using an optical method which permits real-time observation of the growth front. A slow dilatation of the patterns due to a slight curvature of the isotherms drives the system into a permanent regime, close to the threshold for the rod splitting instability. Thus an apparently minor instrumental imperfection suffices to maintain the system near a marginal stability point. This answers the long-standing question of spacing selection in bulk eutectic growth.
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https://hal.archives-ouvertes.fr/hal-00320260
Contributor : Silvère Akamatsu Connect in order to contact the contributor
Submitted on : Wednesday, September 10, 2008 - 3:22:29 PM
Last modification on : Friday, January 14, 2022 - 9:36:05 AM
Long-term archiving on: : Friday, June 4, 2010 - 11:10:23 AM

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  • HAL Id : hal-00320260, version 1
  • ARXIV : 0809.1920

Citation

Mikael Perrut, Silvère Akamatsu, Sabine Bottin-Rousseau, Gabriel Faivre. Hexagonal eutectic solidification patterns operating near a marginal stability point. 2008. ⟨hal-00320260⟩

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