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Colloque Promenade dans la physique d’aujourd’hui / A Stroll through Today’s Physics

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Growth direction and morphology of crystalline dendrites in directional solidification
Alain Pocheau (univ. Aix-Marseille)

28 juin 2007

Growth direction and morphology of crystalline dendrites in directional solidification: the mesoscopic implications of anisotropy in a growth system
The solidification of a material from a melt usually involves the growth of dendritic interfaces. In directional solidification, two directions compete for setting the growth direction of their dendrites: the heat flow direction and a preferred crystalline orientation. As the growth velocity increases, it appears that dendrite growth directions turn from the former direction to the latter direction. Meanwhile, the dendrite morphology changes with important implications regarding the formation of microstructures in the resulting solid. After having exhaustively documented these issues experimentally, we show evidence of an internal symmetry in the date base from which the form of the evolution of dendrite growth directions with parameters can be selected. This reveals an unexpected universality of the implications of anisotropy at mesoscopic scales in this growth system.

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Alain Pocheau Alain Pocheau (univ. Aix-Marseille)