Quasi-elastic cold neutron scattering experiments on molten Al1−xCux alloys (x = 0.10, 0.17 and 0.25) were performed at 3 different temperatures by using a time-of-flight spectrometer and a neutron spallation source. As the main part of the scattering at small Q was incoherent and originated from Cu, self-diffusion coefficients, D, for the Cu ions (table 1) could be determined from the widths of the quasi-elastic peaks. The deduced values were considerably larger than those found using capillary tube measurements. Even if the accuracy of determination of D was better than about 4%, it could not be decided whether the temperature variation of D obeyed an Arrhenius law or a power law.

Diffusion of Cu in AlCu Alloys of Different Composition by Quasielastic Neutron Scattering. U.Dahlborg, M.Besser, M.Calvo-Dahlborg, S.Janssen, F.Juranyi, M.J.Kramer, J.R.Morris, D.J.Sordelet: Journal of Non-Crystalline Solids, 2007, 353[32-40], 3295-9

Table 1

Self-Diffusivity of Cu in Al-Cu