HR: 0830h
AN: C11C-0833    [PDF]
TI: Temperature dependence of the grain boundary migration in ice bicrystals
AU: * Nasello, O B
EM: nasello@roble.fis.uncor.edu
AF: Facultad de Matem tica Astronom¡a y F¡sica de la Universidad Nacional de C¢rdoba, Medina Allende s/n, Ciudad Universitaria, Cordoba, 5000 Argentina
AU: Guzman, P G
EM: pgguzman@roble.fis.uncor.edu
AF: Facultad de Matem tica Astronom¡a y F¡sica de la Universidad Nacional de C¢rdoba, Medina Allende s/n, Ciudad Universitaria, Cordoba, 5000 Argentina
AB: The grain boundary (GB) migration plays a very important role in the texture and fabrics in the glacier and polar ice (Gow A. et al 1997). The study of the GB migration in bicrystalline samples permits the investigation of this complex phenomenon with more details. In this work, the GB movement under the influence of surface was studied in pure bicrystalline ice samples. The bicrystals having a $<1010>$/$60^0$ crystalline misorientation were annealed at -$5^0$C, -$10^0$C, -$15^0$C, -$20^0$C in a silicone oil bath for 170 days. The results obtained were analyzed using the GB movement equation with the Sun and Bauer configuration (Sun and Bauer 1972), driven by capillarity under the retarding effect produced by a diffusion-generated groove at the GB-surface intersection (Di Prinzio y Nasello 1998). Different temperatures GB mobility and the activation energy of the migration process were determined. The results were compared with the results obtained in grain growth in glacier ice.
DE: 1827 Glaciology (1863)
DE: 1863 Snow and ice (1827)
SC: Cryosphere [C]
MN: 2003 Fall Meeting