Relationships Between Grain Boundary Structure and Migration Kinetics

Relationships between grain boundary structure and mobility are briefly outlined and possible mechanisms for low-angle, random high-angle and special high-angle grain boundary migration are suggested. Specifically, displacement of low-angle tilt boundaries is analyzed in terms of likely dislocation...

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Bibliographic Details
Published in:Transactions of the Japan Institute of Metals 1985-11, Vol.27, p.411-418
Main Authors: Bauer, C L, Lanxner, M
Format: Article
Language:English
Online Access:Get full text
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Summary:Relationships between grain boundary structure and mobility are briefly outlined and possible mechanisms for low-angle, random high-angle and special high-angle grain boundary migration are suggested. Specifically, displacement of low-angle tilt boundaries is analyzed in terms of likely dislocation glide and climb mechanisms. In addition, mobilities of (001), (110) and (111) tilt boundaries in bicrystalline thin films of Au have been measured directly by transmission electron microscopy. By comparison of calculated and measured values, it is concluded that mobility of low-angle tilt boundaries is controlled by transfer of vacancies between individual dislocations by a bulk diffusion mechanism, whereas mobility of both random and special high-angle tilt boundaries is controlled by random or coordinated atomic movement by short-circuit diffusion mechanisms. 7 ref.--AA
ISSN:0021-4434