Abstract
The models that are suggested to describe precipitation reactions and phase transformations are almost always on the atomic scale, but the experimental techniques that can be used to examine the phenomena often either integrate the information from many events or operate at somewhat lower resolution. However, phase-contrast lattice imaging and possibly weak beam (Yoshida et al. 1976) techniques of transmission electron microscopy and field-ion microscopy (FIM) (e.g. Boyes et al. 1975 and 1977) can be useful. In principle the images can be interpreted to yield microanalytical data about individual planes or layers of atoms.Images of (200) lattice planes, or more correctly fringes, have been produced from a rolled high purity Aluminium 4.3% Copper alloy containing GP2 or θ" zones. The polycrystalline material is used since the composition is more representative of the applications of this alloy. It was more difficult to produce images of this material than, for example of the visual gold test specimens: it is suggested that this may be due to the increased inelastic cross-sections.
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