Dresden 2014 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 23: Electron Microscopy I - Nanomaterials

MM 23.5: Talk

Tuesday, April 1, 2014, 11:15–11:30, IFW D

Density of Grain Boundaries — •Yulia Buranova, Sergiy Divinskiy, Harald Rösner, and Gerhard Wilde — Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany

In this work we present the results of atomic simulations of different Grain Boundaries (GB) and the corresponding excess free volume defined as a relative density. For this purpose, an image analysis tool was designed that allows analyzing the local mass density on the basis of simulated (or experimental) high-resolution transmission electron microscopy (HRTEM) images. Thereto the intensities of the GB areas were compared with that of the grain interiors and the difference was identified as the density change.

In total 24 different Symmetrical Tilt GB (STGB) were simulated. The density change in the STGB was estimated to be 5-6%. Experimentally, aluminum was investigated using HRTEM. Calculations showed that this method works for the pure samples with thicknesses up to 15nm including aluminum oxide layers. The correctness of the method is evaluated for different artificial configurations including chains of vacancies and solute atoms.The results and the method are discussed.