Berlin 2005 – wissenschaftliches Programm

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M: Metallphysik

M 49: Grenzfl
ächen I

M 49.1: Vortrag

Dienstag, 8. März 2005, 14:45–15:00, TU H2038

TRANSITION FROM LOW ANGLE TO HIGH ANGLE GRAIN BOUNDARIES — •Myrjam Winning — Institut für Metallkunde und Metallphysik, RWTH Aachen, Kopernikusstr. 14, 52056 Aachen

Recent experiments showed a sharp transition from low angle grain boundary to high angle grain boundary behaviour. The transition is marked by a clear change in the activation enthalpy for the grain boundary motion without any extended range. It was found that the transition angle is at the same misorientation angle for the motion of curved as well as planar grain boundaries. We would like to present an overview about the existing experimental results and theoretical considerations of the structure of grain boundaries at the transition. Especially the observation that the transition depends on the rotation axis of the grain boundary is very important, because this will influence the Brandon criterion which is often used in experiments and simulations of grain growth and recrystallization processes.