Morphological Evolution of Grain-boundary Grooving | Effects of Strong Surface Energy Anisotropy on Stationary and Migrating Grain-boundary Grooves

Donghong Min

ISBN 10: 3639177436 / ISBN 13: 9783639177435

Verlag: VDM Verlag Dr. Müller, 2009

Morphological Evolution of Grain-boundary Grooving | Effects of Strong Surface Energy Anisotropy on Stationary and Migrating Grain-boundary Grooves | Donghong Min | Taschenbuch | Englisch | VDM Verlag Dr. Müller | EAN 9783639177435 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu. Bestandsnummer des Verkäufers 101507191

Inhaltsangabe:

Grain-boundary migration controls grain growth and is important in materials processing and synthesis. When a grain boundary ends at a free surface, a groove will develop at the tip to reduce the combined surface and grain-boundary energies. The tilting effect is included into the "quarter-loop" and Sun-Bauer methods of measuring grain-boundary mobility and better agreement with the measured grain-boundary profiles is obtained. A newly developed delta-function facet model is used to prescribe the surface energy. Though most bicrystals show faceted grooves, a few anisotropic bicrystals can form smooth grooves. A migrating groove profile measured on a polycrystalline alumina surface can be well fitted by our model. When a vertical grain boundary that ends at a horizontal free surface, the anisotropic surface energy is asymmetric about the grain boundary. The author shows that the asymmetric groove grows with time t as t1/4. It is found that the asymmetric surface energy tilts the grain-boundary tip sideways, which induces migration of the grain boundary. This asymmetry induced migration is revealed for the first time.

Bibliografische Details

Titel: Morphological Evolution of Grain-boundary ...
Verlag: VDM Verlag Dr. Müller
Erscheinungsdatum: 2009
Einband: Taschenbuch
Zustand: Neu