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Regensburg 2013 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 40: Topical Session: TEM-Symposium - In-Situ I

MM 40.4: Talk

Wednesday, March 13, 2013, 16:00–16:15, H25

Real-time observation of grain boundary migration in graphene with atomic resolution — •Carl Krill1, Simon Kurasch2, Dana Zöllner3, Ossi Lehtinen4, Jani Kotakoski4, Arkady Krasheninnikov4,5, and Ute Kaiser21Institute of Micro and Nanomaterials, Ulm University, Germany — 2Group of Electron Microscopy of Materials Science, Ulm University, Germany — 3Institute of Experimental Physics, University of Magdeburg, Germany — 4Department of Physics, University of Helsinki, Finland — 5Department of Applied Physics, Aalto University, Finland

Grain growth in polycrystalline solids is a materials science manifestation of survival of the fittest, with individual grains seizing every opportunity to steal atoms away from their neighbors. What fate befalls an atom caught in this bitter struggle, subject to the nefarious desires of two or even three neighboring grains? Until now, it has been impossible to answer this question definitively, as experimental techniques lack the spatial and temporal resolution needed to capture atomic-level dynamics during grain growth. By irradiating polycrystalline graphene with electrons in an aberration-corrected TEM, however, we show that grain growth can be studied for the first time experimentally on an atom-by-atom basis. We can watch configurational fluctuations in the boundary core region average out over time, resulting in mesoscopic translation in the direction of local curvature. The extreme case of a small graphene grain completely embedded within a larger one represents an ideal model system for testing the validity of atomic-scale computational models for grain growth.

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