Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session
MM 18.16: Poster
Montag, 31. März 2014, 18:00–20:00, P4
Modeling phase transformations in binary alloys for eutectic systems — •Muhammad Ajmal Choudhary1, Julia Kundin1, Martin Oettel2, and Heike Emmerich1 — 1Lehrstuhl für Material- und Prozesssimulation, Universität Bayreuth, D-95440 Bayreuth. — 2Institut für Angewandte Physik, Universität Tübingen, D-72076 Tübingen.
Phase-field crystal (PFC) modeling has emerged as a promising technique to address the crystal growth phenomena on atomistic length and diffusive time scales. We use a 2D PFC model for a binary alloy system based on Elder et al. [Phy. Rev. B 75, 064107 (2007)] to investigate the size effects on the equilibrium properties of the liquid-solid interface. We analyze the equilibrium properties of liquid-solid interface by stabilizing the circular solid crystal of various radii in the surrounding liquid phase and the liquid droplets of various radii in the solid phase in a finite system size. In particular, we propose the method of determining interfacial energies for a curved liquid-solid interface as function of radius by integrating the grand potential density over the simulation domain. Furthermore, we also derive the free energy barriers for the nucleation and compare the results with the prediction based on the classical nucleation theory.