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Více informací o knize Morphological Evolution of Grain-boundary Grooving

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Anotace knihy

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.

Parametry knihy

• Plný název: Morphological Evolution of Grain-boundary Grooving
• Podnázev: Effects of Strong Surface Energy Anisotropy on Stationary and Migrating Grain-boundary Grooves
• Autor: Donghong Min
• Jazyk: Angličtina
• Vazba: Brožovaná
• Počet stran: 200
• EAN: 9783639177435
• ID: 06826007
• Nakladatelství: VDM Verlag Dr. Müller
• Hmotnost: 314 g
• Rozměry: 220 × 150 × 12 mm
• Rok vydání: 2009

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