Huang diffuse scattering from dislocation loops and cobalt precipitates in copper

High-resolution measurements of the Huang diffuse scattering from dislocation loops in neutron-irradiated copper and cobalt precipitates in Cu:1-wt%-Co crystals have been carried out close to the (200) and (111) reflections using a three-axis x-ray diffractometer. These measurements have been compiled in the form of diffuse intensity contours and compared with calculations based on the dipole-force model for dislocation loops and spherical precipitates. Good agreement was found between the measured and calculated contours and it was shown that the symmetry of the defects could be determined from these measurements. The necessity of considering the elastic anisotropy of the lattice in the calculations was also demonstrated.