Abstract
The interfacial energy of coherent and incoherent deformation twin boundaries in alpha aluminum oxide was measured relative to several crystallographic surfaces. Using thermal grooving and interferometer measurement techniques, the relative interfacial energy obtained for coherent twins was 0.31 (standard deviation = 0.03) with no significant measureable variation relative to different surface planes. The energy of incoherent twin boundaries relative to a {101̄0} plane was 0.58 (standard deviation = 0.03). Observations of crack nucleation from twin-twin intersections, migration of twin boundaries and the interaction of twin boundaries with sub-grain boundaries are reported.
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