Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 14: Topical Session Bulk Nanostrucured Materials III - Microstructure and Characterization I

MM 14.5: Vortrag

Montag, 26. März 2012, 16:45–17:00, H 0107

Self-similarity in junction controlled grain growth — •Dana Zöllner and Peter Streitenberger — Abteilung Materialphysik, Institut für Experimentelle Physik, Otto-von-Guericke-Universität, 39106 Magdeburg

The question of self-similarity in normal grain growth and particle coarsening has been a topic of research for decades, where statistical self-similarity was either found as an observation in experiments and simulations or used as an assumption for theoretical considerations. In the present work we show that self-similarity is also a feature of junction limited grain growth as it can be found in nanocrystalline materials. To that aim we analyse the influence of the various grain boundary junctions on grain growth kinetics by attributing to each type of boundary junctions an own specific energy and mobility resulting in nine types of growth kinetics each characterised by a self-similar scaling form of the growth law and corresponding self-similar grain size distribution function. In particular, for the cases of grain boundary, triple line and quadruple point mobility controlled grain growth the analytical model is in excellent agreement with the results of a modified Monte Carlo Potts model simulation based on a limited mobility of the boundary junctions.