Dresden 2011 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 36: Topical Session Electron Theory V

MM 36.1: Topical Talk

Thursday, March 17, 2011, 14:00–14:30, IFW A

Thermodynamics and Kinetics of Grain Boundary Junctions — •Guenter Gottstein, Luis Barrales, Lasar S. Shvindlerman, and Bingbing Zhao — RWTH Aachen University, Institute of Physical Metallurgy and Metal Physics, 52056 Aachen, Germany

Grain Boundaries in polycrystals are connected by grain boundary junctions, which coordinate the kinetic behavior of grain boundary systems, like migration or segregation. Therefore, grain boundary networks are likely to behave differently from solitary grain boundaries. We show that grain boundary junctions are crystal defects on their own with specific thermodynamic and kinetic properties and that these properties affect microstructural evolution during grain growth. Novel experimental methods will be introduced on how to determine the thermodynamic and kinetic properties of junctions, and theoretical approaches will be proposed how to modify existing theories of polycrystal kinetics to account for junction effects. Finally, computer simulations of grain boundary motion and grain growth will be presented to demonstrate the effect of junctions on kinetics, grain size, and texture.