Synchrotron X-ray topography was used to study dislocation behavior around notches in single crystals during in situ deformation at a constant strain-rate. During deformation at -8C, a dislocation-depleted zone formed above the notch while a vertical array of dislocations formed below it. Modeling of the interaction between basal-plane dislocation loops and notch stress-fields suggested that the dislocation-depleted zone arose from dislocations that glided completely through the specimen. The dislocation activity around the notch at -8C was much greater than that at -40C and -60C.

Dislocation Motion around Loaded Notches in Ice Single Crystals. D.Cullen, X.Hu, I.Baker, M.Dudley: Cold Regions Science and Technology, 2000, 31[2], 103-17