Electron diffraction investigation of diffuse reflections in AuFe alloys

Abstract

A transmission electron microscopy study was conducted to clarify the positions of the diffuse reflections and streaks in the reciprocal lattice of AuFe alloys. These features are described and discussed as a function of iron content, aging time and other factors. It is found that the diffuse streaks along 110 are produced by a strain effect and often smear out ( 1 1 2 0 ) reflections and 210 streaks. Various considerations, based on habit plane calculations and information from real and reciprocal lattices, preclude the possibility that the ( 1 1 2 0 ) reflections are produced by the intersectionof 210 streaks due to a shape effect from iron-rich platelets or Guinier-Preston (G-P) zones lying along {420} planes.