INTRINSIC DEFORMATION PROPERTIES OF ICOSAHEDRAL AL-PD-MN SINGLE QUASI-CRYSTALS

Plastic deformation experiments were performed on icosahedral Al-Pd-Mn single-quasicrystals to determine the thermodynamic activation parame ters of the deformation process. The stress exponent and the strain-ra te sensitivity of the flow stress were obtained by means of stress rel axation experiments. The activation enthalpy of the deformation proces s was measured by temperature change experiments. In the range from 73 0 to 800-degrees-C a nearly constant value of about 7 eV was determine d.