Evolution of ice crystal microstructure during creep experiments

Authors: Hamann, Ilka; Weikusat, Christian; Azuma, Nobuhiko; Kipfstuhl, Sepp

Source: Journal of Glaciology, Volume 53, Number 182, July 2007 , pp. 479-489(11)

Publisher: International Glaciological Society

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Abstract:

Results of laboratory uniaxial compression tests over the stress range 0.18-0.52 MPa and the strain range 0.5-8.6% at approximately -5 and -20°C are presented. Grain-size analysis and comparisons with annealing tests confirm that grain-growth reducing processes are active during deformation. Microstructural observations reveal that sub grain-rotation re crystallization and grain shape changes due to strain-induced grain-boundary migration are the causes of the grain-growth deceleration. Further results from microstructural observations show that obstacle formation by dislocation walls and sub grain boundaries is the reason for isotropic hardening during creep. Sub grain boundary types that are likely to be relevant for studies on the activity of different dislocation types are described.

Document Type: Research article

DOI: 10.3189/002214307783258341

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