The nature of the interface which formed between nitride particles and Ni, in an internally nitrided Ni-0.1wt%Ti alloy, was studied by means of transmission electron microscopy. The TiN particles were highly faceted, were bounded by {010}TiN faces, and exhibited various cuboid, lath or plate morphologies. Five different orientation relationships of the TiN with respect to the Ni matrix were found, and O-lattice, coincident-site lattice and plane-matching models were used to determine why the system chose certain orientation relationships between the 2 phases. The results suggested that all 3 models could explain some of the observations, but no single model could explain all of the results. Sets of parallel misfit-compensating dislocations were observed for two of the plate-shaped variants. The line directions and spacings of these dislocations were compatible with a Burgers vector of (a/2)[100]TiN; lying in the (010)TiN habit plane of the TiN plates.

G.C.Savva, J.S.Kirkaldy, G.C.Weatherly: Philosophical Magazine A, 1997, 75[2], 315-30