A new approach to the interpretation of edge facets was presented. The orientations and dislocation structures of the edge facets of α-precipitates in a β-matrix in this alloy were investigated by using a near-coincidence-site model, combined with an analysis of Moiré planes based upon O-lattice theory. The distribution of near-coincidence-site clusters exhibited 2 orders of modulated periodicities, which could be defined by the approximate intersections between several sets of Moiré planes. Two possible edge facets were suggested, based upon the near-coincidence-site distribution. By using the misfit analysis, dislocation structures in the edge facets were calculated. The calculated orientations and dislocation structures of the edge facets were consistent with experimental observations.

Near-Coincidence-Sites Modeling of the Edge Facet Dislocation Structures of α Precipitates in a Ti–7.26wt%Cr Alloy. F.Ye, W.Z.Zhang, D.Qiu: Acta Materialia, 2006, 54[20], 5377-84