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MM: Fachverband Metall- und Materialphysik

MM 27: Phase Transformations II

MM 27.3: Talk

Wednesday, March 16, 2011, 15:00–15:15, IFW D

Phase-field simulation of dendritic growth in the system Al-Si — •Sebastian Schulz, Abhik Choudhury, and Britta Nestler — Institute of Materials and Processes, Karlsruhe, Germany

The strength of the phase-field method to simulate material alloy systems has been demonstrated over the years. The method however, requires the knowledge of the Gibbs-free energy of the phases involved in the transition which can be derived via the Calphad method. In the present study, we build the methodology for the direct use of thermodynamic databases in the simulation of material alloys, using the phase-field method. Using this set-up, we investigate the effect of small additions of a third component on dendritic growth in the cast Al-Si system. In particular, we study the effect of these additions on the dendritic arm spacing, in a directional solidification setup and attempt to derive relationships between the amount of additions of the third component and the physical parameters like interfacial surface tensions, through systematic parameter studies and comparison with experiments.