Abstract

Abstract A quantitative model was developed to describe displacement fringes on the faces of γ′ precipitate plates using two-beam dynamical theory. It is shown that theoretical intensity profiles agree with experimentally observed profiles from transmission electron microscope images obtained under identical conditions. It is also shown that, contrary to the suggestions of other investigators, the displacement vector at the precipitate–matrix interfaces does not have to be introduced phenomenologically when the crystallography is known, and segregation of Ag to stacking faults cannot be determined by analysing the fringe spacing.

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