Displacements from Cu₄Ti in a Cu-Ti single crystal using small-angle and diffuse X-ray scattering: a synchrotron radiation study

Single crystals of Cu-2.5 at.% Ti have been studied by small-angle and large-angle X-ray scattering to determine the displacements induced by the formation and the coarsening of ordered Cu₄Ti precipitates. The variation of the atomic scattering factor of Cu near its absorption edge was used to confirm the nature of the precipitates and to show that the scattering appearing near Bragg peaks was due to the displacements of the atoms from their positions, induced by the formation of the precipitates, and not to the segregation of the Ti atoms.