Hexagonal eutectic solidification patterns operating near a marginal stability point

Details Hexagonal eutectic solidification patterns operating near a marginal stability point Hexagonal eutectic solidification patterns operating near a marginal stability point

2008-09-11

arxiv.org/abs/0809.1920v1

Nonlinear Sciences

Pattern Formation and Solitons

Scientific paper

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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