Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster Session

MM 15.18: Poster

Montag, 11. März 2013, 18:00–20:00, Poster E

Time dependent development of decorated grain boundaries of severely plastically deformed Al by liquid Ga — •mehrnoosh naderi, martin peterlechner, gerhard wilde, and sergiy divinskiy — Institute of Material Physics, University of Muenster, Germany

Fast liquid penetration into the grain boundary network of a polycrystalline solid is observed for different metallic or ceramic couples. Yet, the detailed mechanism as well as morphological features or the kinetics of the penetration process are not well understood. Recent models relate the liquid penetration process to the mechanical properties of the grain boundaries. In order to investigate the importance of defect structures and residual stresses at grain boundaries for the liquid penetration kinetics, the penetration behavior of liquid Ga along fine grains of polycrystalline Aluminum produced by High Pressure Torsion was studied at room temperature. Scanning Electron Microscopy (SEM) and the so-called Automated Crystal Orientation Mapping (ACOM) technique that measures the orientations in a transmission electron microscope (TEM) have been used for this study. The development of decorated grain boundaries was investigated by SEM and the thickness of Ga layer at grain boundaries was obtained less than 1.5 nm from ACOM data as well. The results are discussed with respect of the underlying mechanism that drives liquid penetration into the grain boundary network.