Numéro
J. Phys. I France
Volume 2, Numéro 2, February 1992
Page(s) 193 - 205
DOI https://doi.org/10.1051/jp1:1992133
DOI: 10.1051/jp1:1992133
J. Phys. I France 2 (1992) 193-205

Interface dynamics and anisotropy effects in directional solidification

S. de Cheveigné and C. Guthmann

Groupe de Physique des Solides, Tour 23, 2 Pl. Jussieu, 75251 Paris Cedex 05, France


(Received 6 May 1991, revised 4 October 1991, accepted 28 October 1991)

Abstract
A study of the dynamics of the cellular solid-liquid interface in directional solidification of dilute CBr 4 alloy has allowed us to observe a number of secondary instabilities (travelling states, optical modes, anomalous cells, etc.) some of which were well known and traditionally attributed to the effect of crystalline anisotropy. However, most of these instabilities are also observed in a hydrodynamic analog of directional solidification, directional viscous fingering (M. RABAUD, S. MICHALLAND and Y. COUDER, Phys. Rev. Lett. 64 (1990) 184). This analogy enables us to discuss the interplay of crystalline anisotropy and of the dynamics generic to one-dimensional systems in directional solidification.

Résumé
Une étude de la dynamique de l'interface cellulaire en solidification directionnelle d'un alliage binaire dilué de CBr 4 nous a permis d'observer un certain nombre d'instabilités secondaires (propagation de cellules inclinées, modes optiques, cellules anormales, etc.) dont certaines étaient bien connues et traditionnellement attribuées à des effets de l'anisotropie cristalline. Cependant, la plupart de ces instabilités sont observables dans une expérience qui est l'analogue hydrodynamique de la solidification directionnelle, la digitation visqueuse dirigée ou instabilité de l'imprimeur (M. RABAUD, S. MICHALLAND and Y. COUDER, Phys. Rev. Lett. 64 (1990) 184). Cette analogie va nous permettre de discuter les rôles respectifs de l'anisotropie cristalline et de la dynamique propre aux systèmes uni-dimentionnels.



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