Abstract
Electron micrographs of annealed Cu-15 at.% Al splats reveal strain contrasts which are assumed to be caused by internal strain fields due to short range order (SRO). A model is developed which characterizes the SRO structure of α-Cu-Al by a contiguous microdomain arrangement. The structure within the microdomains is assumed to be a two-dimensional antiphase shift structure with non-uniform and irregular shift spacings, based on the L1 2 superlattice structure. The domain size for short range ordered Cu-16 at.% Al was obtained to be 1.7 nm using diffuse X-ray scattering data by Borie and Sparks. Electron diffraction experiments confirmed the theoretical relation between the SRO diffuse scattering and the Fermi surface, established by Moss. For Al concentrations exceeding the solubility limit of α-Cu-Al, two different superlattice phases were found by electron diffraction. At 340°C, the known phase α 2 was found, the structure of which is a one-dimensional antiphase shift structure with a step length of 4 3 . At 250°C, a new one-dimensional antiphase shift structure with a step length of 7 5 was detected. The new phase was designated α 3.
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