Neutron Irradiation Effects in a Copper-Aluminum Alloy

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Abstract
Diffuse x‐ray scattering and peak intensities were measured for a polycrystalline alloy of copper‐14.5 atomic percent aluminum before and after irradiation. It was shown that the average short‐range order configuration in the first five neighboring shells was somewhat enhanced as a result of the irradiation. In addition, a temperature independent rise was observed in the diffuse scattering. This was interpreted in terms of static atomic displacements arising from the localized volume changes associated with neutron damage. The absence of line broadening or significant line shifts after irradiation is further confirmation of the localized nature of the damage. Defect models of radiation damage involving short range effects which average out over larger distances in the lattice are discussed.

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