Dislocation densities and arrangement parameters, and crystallite sizes and size distributions, were determined in tensile or cyclically deformed polycrystalline Cu specimens by means of X-ray diffraction peak profile analysis. The Fourier coefficients of profiles measured by using a special high-resolution X-ray diffractometer, with negligible instrumental broadening, were fitted by using Fourier transforms of ab initio size and strain profiles. It was found that, in the fatigued samples, the dislocations were mainly of edge-type, with a strong dipole character. The dislocation densities in the fatigued specimens were found to be higher than those in tensile-deformed samples, for given saturation and flow-stress levels.

Dislocation Structure and Crystallite Size Distribution in Plastically Deformed Metals Determined by Diffraction Peak Profile Analysis. T.Ungár, G.Ribárik, J.Gubicza, P.Hanák: Journal of Engineering Materials and Technology, 2002, 124[1], 2-6