Author(s): Fuping Liu; Ian Baker; Michael Dudley; Gongda Yao
Linked Author(s):
Keywords: No Keywords
Abstract: Dislocations and grain boundaries in 2mm thick specimens of columnar-grained polycrystalline ice have been studied by white beam synchrotron X-ray topography. Clear images of dislocation structures in several grains were recorded simultaneously. Numerous stacking faults were observed after rapid cooling, but a stacking-fault-free zone was found near grain boundaries. The size of this depleted zone in a particular grain is a function of the angle between the basal plane and the grain boundary. Prismatic punching of dislocations around inclusions was also observed. In situ straining experiments clearly revealed grain boundary generation of dislocations. The dislocations once generated as semi-hexagonal loops slipped on the basal plane.
Year: 1992