Abstract
The resolution of lattice fringes in ordered and partially ordered Cu 3Au has been calculated using the dynamical theory of electron diffraction, taking into consideration the effects of such variables as foil thickness and orientation, objective lens defocus, degree of order and, for partially ordered alloys, the position of small ordered domains in the foil. The experimental observations were found to be in excellent agreement with these calculations. Lattice defects in ordered Cu 3Au have been studied using this technique. Thus, the domain wall thickness at translational antiphase domain boundaries has been shown to be one or two atomic diameters and the antiphase boundary separating the pair of fundamental lattice dislocations which constitute a superdislocation has been revealed. A clear distinction exists between the lattice image contrast of predominantly ordered and disordered regions and this has been utilized to study partial long-range order and short-range order. Short-range order in this system is characterised by a dispersion of small highly ordered domains, ~15 Å dia., in a predominantly disordered matrix.
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