Dresden 2009 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 23: Topical Session Heterogeneous Nucleation and Initial Evolution of Microstructure - Poster
MM 23.7: Poster
Dienstag, 24. März 2009, 14:45–16:30, P4
Numerical Simulation of Heterogeneous Nucleation and Microstructure Formation in Al-Ni Alloy System — •Ricardo Siquieri1, Evelyn Doernberg2, Heike Emmerich1, and Rainer Schmid-Fetzer2 — 1Computational Materials Engineering, Center of Computational Engineering Science and Institute of Minerals Engineering, RWTH Aachen, Mauerstrasse 5, D-52064 Aachen, Germany — 2Institut für Metallurgie, Robert-Koch-Straße 42, 38678 Clausthal-Zellerfeld, Germany
Many important technological materials including magnetic and super-conducting alloys are produced through solidification in peritectic systems. Although this class of materials is very important for the industry, many aspects of its solidification process are still unclear. To help with gaining a comprehensive and reliable understanding of this process, we will present numerical investigation of peritectic solidification for the system Al-Ni alloy in this contribution. For this purpose, recent developments of phase-field field techniques will be combined with thermodynamic precision data aiming a systematic investigation of all stages of peritectic solidification: Heterogeneous nucleation, peritectic reaction, peritectic transformation, and direct growth of the peritectic phase. This model approach allows us to make conclusions based on its comparison with experimental measurements as well as employ it to obtain new relations between processing parameters and the resulting kinetics and dynamics of the phase-transformation process during all of the four stages above.