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M: Metallphysik

M 6: Symposium: Phasenumwandlungen in Schmelzen IV

M 6.1: Vortrag

Montag, 24. März 2003, 16:30–16:45, IFW A

Scaling relations in binary alloys — •Heike Emmerich¹, Matthias Jurgk², and Ricardo da Silva Siquieri¹ — ¹Lehrstuhl für Thermodynamik, FB CT, Uni Dortmund, Emil Figge Str. 70, 44227 Dortmund — ²Max Planck Institut für Physik komplexer Systeme, Noethnitzer Str. 38, 01187 Dresden

Within this contribution a two scale model for a characteristic macroscopic domain of a binary alloy is introduced. This model is then employed to derive new scaling relations for the velocity of resulting morphologies in different regions of the phase diagram of a binary alloy. Their dependence on nucleation density and geometric constraints is investigated. Finally their impact on multi-scale approaches to treat a full solidifying sample is discussed.