On the dislocation structure of low angle (110) twist boundaries and its relationship to the O-lattice

Abstract

Several (110) twist boundaries in gold were examined by transmission electron microscopy. Thin film bicrystal specimens were used which were prepared by welding together single crystal epitaxial (110) gold films. Twist angles, theta, of 1/sup 0/ to 5/sup 0/ were used. The dislocation arrays were examined at 125 kV and imaged using (anti 1 11), (1 anti 1 1), (002) and (2 anti 2 0) reflections. The results emphasize the fact that the O-Lattice approach to the structure of grain boundaries may not be straightforward. In general, both simple homogeneous transformations and inhomogeneous transformations must be considered and there is no simple way to predict which may actually apply. Such procedures are equivalent, of course, to searching for the dislocation network of minimum energy.