Abstract
The microstructure of NbC ≈0.88 single crystals has been studied by means of conventional transmission electron microscopy (TEM) and high resolution electron microscopy (HREM) assisted by “Multislice” calculations. The general characterization of ordering effects, i.e. short-range ordering and long-range ordering induced by long term annealing, is reported and discussed in relation to the literature on the NbC and VC systems. The structure of a 2 〈110〉 dislocations is also examined: at the resolution of the weak-beam dark-field technique, there is no evidence for a splitting of the perfect dislocations; at the atomic resolution of direct lattice imaging, a narrow glissile dissociation of about 8 Å has been resolved for a screw dislocation; this observation brings some credit to the commonly accepted model for glide of dislocations in the cubic transition metal carbides.
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