Properties of mass transport in liquid Al80Cu20 were measured over a broad temperature range of more than 500K by means of oscillating cup viscometry and quasi-elastic neutron scattering. The shear viscosity and the coefficient of the Cu self-diffusion exhibited an Arrhenius-type temperature dependence. The activation energy for the viscous flow was 2.4 times smaller than that for Cu self-diffusion. Below 1400K, the Cu self-diffusion became increasingly smaller than expected from the viscosity data; re-scaled via the Stokes–Einstein relationship.

Liquid Al80Cu20 - Atomic Diffusion and Viscosity. J.Brillo, S.M.Chathoth, M.M.Koza, A.Meyer: Applied Physics Letters, 2008, 93[12], 121905