The nature of the interface formed between TIN particles and Ni in an internally nitrided Ni-0.1 wt% Ti alloy has been studied by conventional transmission electron microscopy. The TiN particles were observed to be highly faceted, bounded by {010}(TiN) faces, and they displayed a variety of cuboid, lath or plate morphologies. Five different orientation relationships of TiN were found with the Ni matrix. O-lattice, coincident-site lattice and plane-matching models were used to rationalize why this system chooses a select, but discrete, number of orientation relationships between the two phases. The results of this analysis suggest that all three models can help to explain many of the observations, but no single model explains all the results. Sets of parallel misfit-compensating dislocations were observed at two of the plate-shaped variants. The line directions and spacings of these dislocations were compatible with Burgers vectors b = (a/2)[100](TiN), lying in the (010)(TiN) habit plane of the TIN plates.
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