True absolute grain boundary mobility: Motion of specific planar boundaries in Bi-bicrystals under magnetic driving forces

Journal Article · Fri Oct 09 00:00:00 EDT 1998 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(98)00258-4· OSTI ID:289518

Molodov, D A; Gottstein, G ^[1]; Heringhaus, F ^[2]; Shvindlerman, L S ^[3]

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1. RWTH Aachen (Germany). Inst. fuer Metallkunde und Metallphysik
2. National High Magnetic Field Lab., Tallahassee, FL (United States)
3. Russian Academy of Sciences, Chernogolovka (Russian Federation). Inst. of Solid State Physics

The migration of planar 90{degree}{l_angle}112{r_angle} tilt grain boundaries with the same misorientation but different boundary inclination in Bi-bicrystals was investigated. The driving force for grain boundary motion was created by the action of a magnetic field on bicrystals of bismuth, which is magnetically anisotropic with different 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 90{degree}{l_angle}112{r_angle} tilt grain boundary were much smaller than for an asymmetrical ({psi} = 45{degree}) 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.

• OSTI ID: 289518
• Journal Information: Acta Materialia, Vol. 46, Issue 16; Other Information: PBD: 9 Oct 1998
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GRAIN BOUNDARIES
BISMUTH
BICRYSTALS
MAGNETIC FIELDS
MOBILITY
GRAIN ORIENTATION
TEMPERATURE DEPENDENCE