Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 21: Microstructure and Phase Transformations II
MM 21.3: Vortrag
Dienstag, 27. März 2012, 10:45–11:00, H 0106
A phase-field study of morphology effects in heterogeneous nucleation — •Henning Hörstermann, Julia Kundin, and Heike Emmerich — Material- und Prozesssimulation, Universität Bayreuth, 95448 Bayreuth, Germany
The effect of the morphology of the primary phase on heterogeneous nucleation in peritectic materials is studied using a quantitative phase-field method on an example of an Al-Ni peritectic alloy based on the refined thermodynamic data related to the Gibbs energies of the phases. The nucleation energy barrier of the peritectic Al3Ni2 phase is estimated by determining the critical nucleus radius in three dimensions for different shapes and curvatures of the primary Al3Ni seed. The undercooling of the peritectic reaction used in the simulations was taken from DSC experiments. The nucleation energy and the contact functions calculated from the phase-field simulations are compared to predictions from classical nucleation theory.