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The heterogeneous nature of slip in ice single crystals deformed under torsion

Abstract : Ice single crystals were deformed under torsion and dislocation arrangements were analyzed by synchrotron topography at ESRF (European Synchrotron Radiation Facility). Profile analysis of the topographs revealed the scale-invariant character of the dislocation arrangement with long-range correlations. Dislocation density gradients are shown to be slightly anti-correlated as the intensity profile is similar to an anti-persistent random walk-like signal. This analysis reveals the influence of internal stresses on dislocation arrangement up to the sample scale. Similar observations in reversed torsion experiments, together with strong hardening behaviour, allow a mechanism of cross-slip of basal dislocations on prismatic planes to be suggested for interpretation of local dislocation interaction behaviour.
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Submitted on : Thursday, April 16, 2009 - 8:41:14 AM
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Maurine Montagnat, Jérôme Weiss, J. Chevy, Paul Duval, H. Brunjail, et al.. The heterogeneous nature of slip in ice single crystals deformed under torsion. Philosophical Magazine, Taylor & Francis, 2006, 86 (27), pp.4259 à 4270. ⟨10.1080/14786430500452602⟩. ⟨insu-00375732⟩

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