Dresden 2006 – wissenschaftliches Programm

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SYSS: Structure Formation and Self-Organization in non-equilibrium Systems

SYSS 3: Structure Formation and Self-Organization in non-equilibrium Systems - Poster

SYSS 3.2: Poster

Donnerstag, 30. März 2006, 16:00–18:00, P1

Dendritic and fractal patterns formation in non-equilibrium solidification — •Peter Galenko and Dieter Herlach — Institut für Raumsimulation, DLR, 51170 Köln, Germany

Results of computational modeling are synthesized for the forms of crystals growing in undercooled liquid. Solidification patterns are analyzed as a result of the first-order phase transformation controlled by the heat and mass diffusion, atomic kinetics, and interfacial anisotropy. It is shown that fractal patterns are observed at a vanishing anisotropy of surface energy and atomic kinetics of the solid-liquid interface. Simulated patterns are summarized into morphological spectrum which is considered as a sequence of growth shapes that forms versus undercooling (deviation from thermodynamic equilibrium) in solidifying system. A diagram “complexity of growth forms” as a function of “microscopic disorder and deviation from equilibrium” is presented. The work was supported by DFG under contract No. He 1601/13.