Dresden 2009 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 27: Interfaces I
MM 27.4: Vortrag
Mittwoch, 25. März 2009, 12:15–12:30, IFW B
3D Vertex Dynamics Simulation of Grain Growth in Ceramics Including the Anisotropy of Grain Boundary Energy — •Melanie Syha1, Ling Yue1, Daniel Weygand1, and Peter Gumbsch1,2 — 1Universität Karlsruhe, Institut für Zuverlässigkeit von Bauteilen und Systemen — 2Fraunhofer IWM, Freiburg
A three dimensional (3D) vertex dynamics model for grain growth is presented, adapted to the study of grain growth in Strontium-Titanate-Oxide (STO) ceramics. The 3D vertex dynamics model for grain growth is an interface tracking model [1]. In this approach grain boundaries (GB) are discretized and their time evolution is derived from the minimization of the GB energy, which is dissipated by the motion of the GBs and triple lines. The original model [1,2] has been extended to handle misorientation and inclination dependent GB energies, mobilities and triple line drag. The improved model is compared to the 3D analogue of the Neumann-Mullins law [3].
The influence of structure dependent GB properties on statistical observables, e.g. grain size distribution function, grain growth dynamics and correlation function between grain size and number of neighboring grains is investigated. Cross sections through the grain structures are analyzed and compared to experimental observations on grain growth in STO ceramics
[1] D. Weygand, Y. Bréchet, J. Lépinoux, and W. Gust, Phil. Mag. B 79 (1999) 703. [2] D. Weygand, Y. Bréchet and J. Lépinoux, Interface Science 7 (1999) 285. [3] R. MacPherson and D. Srolovitz, Nature 446 (2007) 1053