Plastic bending of diamond plates

Abstract

Type I and type II diamond plates have been plastically deformed by three-point loading at 1800°c in an inert atmosphere. The type I specimens deformed at significantly higher stresses than did type II specimens. Electron microscope results indicated that the impurity platelets found in type I diamonds acted as efficient obstacles to the movement of dislocations. In type I diamonds where the platelets were not homogeneously distributed in the specimen the deformation was produced primarily by dislocation movement in regions where there were no platelets.