Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 57: Surface dynamics II

O 57.9: Vortrag

Mittwoch, 24. März 2010, 17:00–17:15, H40

Mechanically induced grain boundary motion in Al-bicrystalls — •Tatiana Gorkaya, Dmitri A. Molodov, and Günter Gottstein — Institut für Metallkunde und Metallphysik der RWTH Aachen, Aachen, Deutschland,

The mechanically induced migration of planar grain boundaries in Al-bicrystals was experimentally measured. The novel tensile/compression module for scanning electron microscope was utilized for in-situ measurements of grain boundary motion at elevated temperatures. From the measured temperature dependence of boundary mobility the migration activation parameters for investigated boundaries were determined. Normal boundary motion was observed to be coupled to a shear of the crystal in the region traversed by the grain boundary during its motion. The measured ratios of the normal grain boundary motion to the lateral translation of grains were compared with geometrical models of stress induced boundary migration.