Article Dans Une Revue Philosophical Magazine a Année : 2005

Stability of lamellar eutectic growth in thick samples.

Silvère Akamatsu
Gabriel Faivre
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Résumé

The growth front of a transparent non-faceted eutectic (CBr4–C2Cl6) is observed from the top in real time in thick samples during directional solidification. We study the stability of the lamellar patterns at near-eutectic concentrations as a function of the spacing λ and the pulling velocity V. The domain of stability of the symmetrical (straight) lamellar patterns is limited by an Eckhaus instability followed by eliminations of lamellae at λ/λ m  ≈ 0.7, where λ m   V −0.5 is the minimum-undercooling spacing, and a zigzag bifurcation at λ/λ m  ≈ 0.85. A lamella break-up instability occurs at λ/λ m  ≈ 1.1. Wall effects and topological defects play a major role during transients. No important anisotropy effect is observed, except near eutectic grain boundaries.

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Dates et versions

hal-00008945 , version 1 (21-09-2005)

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Silvère Akamatsu, Sabine Bottin-Rousseau, Gabriel Faivre. Stability of lamellar eutectic growth in thick samples.. Philosophical Magazine a, 2005, Frontiers in Solidification Science, 86 (24), pp.3703-3715. ⟨10.1080/14786430500157003⟩. ⟨hal-00008945⟩
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