Articles liés à Morphological Evolution of Grain-boundary Grooving:...

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

Min, Donghong

 
9783639177435: Morphological Evolution of Grain-boundary Grooving: Effects of Strong Surface Energy Anisotropy on Stationary and Migrating Grain-boundary Grooves
Couverture souple
ISBN 10 : 3639177436 ISBN 13 : 9783639177435
Editeur : VDM Verlag, 2009

Synopsis

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.

Les informations fournies dans la section « Synopsis » peuvent faire référence à une autre édition de ce titre.

Présentation de l'éditeur

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.

Biographie de l'auteur

Dr. Donghong Min got her Ph. D in Mechanical Engineering from Louisiana State University in 2005 with work on morphological evolution of grain-boundary grooving. She is active member in American Association for Cancer Research, American Chemical Society, American Heart Association, Materials Research Society.

Les informations fournies dans la section « A propos du livre » peuvent faire référence à une autre édition de ce titre.

Éditeur
VDM Verlag
Date d'édition
2009
Langue
anglais
ISBN 10 
3639177436
ISBN 13 
9783639177435
Reliure
Broché
Nombre de pages
200
Coordonnées du fabricant
non disponible
Personne responsable
non disponible