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Compressive creep of ice containing a liquid intergranular phase: Rate‐controlling processes in the dislocation creep regime
Author(s) -
De La Chapelle S.,
Milsch H.,
Castelnau O.,
Duval P.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1998gl900289
Subject(s) - creep , materials science , dislocation creep , anisotropy , intergranular corrosion , dislocation , slip (aerodynamics) , diffusion creep , wetting , composite material , crystallite , metallurgy , thermodynamics , microstructure , optics , grain boundary , physics
Experiments have been conducted to investigate the effect of melt on the creep behavior of polycrystalline ice deformed in the dislocation creep regime. The transition between a mode with a stress exponent n = 3 and a mode with n < 2 is observed for both melt‐free and melt‐added ice samples. The large influence of the melt phase is not related to the wetting characteristics of the liquid. Owing to the large plastic anisotropy of the ice crystal, the liquid phase would attenuate the internal stress field which develops during the primary creep. The contribution to the deformation of the basal slip (the weaker slip system) would increase with the melt content.