Grain Boundary Sliding in Alumina Bicrystals
A technique has been developed for forming bicrystals of alumina with controlled grain boundary orientation by pressure-sintering in vacuo. Bicrystals with tilt misorientations prepared by this technique have been tested in compressive shear and the stress-strain relationship determined. Bicrystal fracture strengths at several temperatures are reported. The microstructural features of the fractured crystal boundaries were examined and related to the observed mechanical behavior.
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