Experimental data on the plastic deformation of icosahedral single quasicrystals were explained in terms of dislocation models. The occurrence of a yield drop, followed by a range of steady-state deformation, was attributed to the effects of dislocation multiplication and recovery upon both the mobile dislocation density and the internal stress. The activation volume for deformation was a unique function of the stress. The activation enthalpy and the Gibbs free energy, as calculated using Schoeck's formula, exhibited approximately constant values above 700C, but decreased strongly below this temperature. In the temperature range where steady-state deformation was possible, the flow stress was thought to be controlled by both the friction of moving dislocations and the recovery processes which took place during deformation.

Plastic Deformation of Icosahedral Al-Pd-Mn Single Quasicrystals - Interpretation of the Experimental Results. U.Messerschmidt, M.Bartsch, B.Geyer, M.Feuerbacher, K.Urban: Philosophical Magazine A, 2000, 80[5], 1165-81