Dynamic Recrystallization of Ice in Polar Ice Sheets

P. Duval , O. Castelnau

The deformation and recrystallization mechanisms which control the viscoplasticity of ice from polar ice sheets have been investigated. The high plastic anisotropy of ice crystals is responsible for the development of a non uniform intemal stress field within the polycrystal. Strain-shadows produced by sub-grain are observed in polarized light when the rotation recrystallization regime is dominant. Migration recrystallization occurs for a temperature higher than -10°C. and is characterized by a unique relationship between recrystallized grain size and stress. The role of dynamic recrystallization in the development of lattice preferred orientations is discussed. Lattice rotation by intracrystalline slip is the dominant mechanism when grain growth or rotation recrystallization occurs.

Domaines: Articles anciens

P. Duval, O. Castelnau. Dynamic Recrystallization of Ice in Polar Ice Sheets. J. Phys. IV, 1995, 05 (C3), pp.C3-197-C3-205. ⟨10.1051/jp4:1995317⟩. ⟨jpa-00253683⟩