True absolute grain boundary mobility: motion of specific planar boundaries inBi-bicrystals under magnetic driving forces
✍ Scribed by D.A Molodov; G Gottstein; F Heringhaus; L.S Shvindlerman
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 219 KB
- Volume
- 46
- Category
- Article
- ISSN
- 1359-6454
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✦ Synopsis
AbstractÐThe migration of planar 908h112i tilt grain boundaries with the same misorientation but dierent boundary inclination in Bi-bicrystals was investigated. The driving force for grain boundary motion was created by the action of a magnetic ®eld on bicrystals of bismuth, which is magnetically anisotropic with dierent susceptibilities parallel and perpendicular to the trigonal axis. The driving force dependency of boundary velocity was measured and the absolute value of grain boundary mobility was determined. The grain boundary mobility was found to strongly depend on grain boundary inclination. The mobility parameters (activation enthalpy and preexponential factor) for a symmetrical 908h112i tilt grain boundary were much smaller than for an asymmetrical (c = 458) boundary. The mobility of the asymmetrical grain boundary depended on the direction of motion. For the given crystallography the boundary moved faster, if the trigonal axis in the growing grain was parallel rather than perpendicular to the direction of motion.