Abstract
The local atomic arrangements in gold-nickel alloys are determined as a function of composition by observations of diffuse X-ray scattering. Measurements are made at − 190°C on alloys quenched from above the solubility gap, there being experimental evidence to show that the high temperature atomic configurations can be retained on quenching. The X-ray data reveal that these alloys exhibit a preference for unlike neighbors above the solubility temperature and have short range order analogous to that in copper-gold alloys. The sizes of the atoms in the solid solutions are also measured from the diffuse scattering. The gold atom in solution is smaller than in the pure metal, but larger than the average atomic dimension calculated from the lattice parameter of the solution. Correspondingly, the nickel atom in solution is larger than in the pure metal, but smaller than the average atomic dimension of the solution. Moreover, the size of each atom varies with the composition of the solution.
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