A fractional model of viscoelastic relaxation

The fractional model of viscoelastic relaxation was applied for the analysis of the high temperature internal friction background in two materials: a γ-TiAl-based alloy and a tetragonal polycrystalline zirconia ceramic (ZrO2–2.8 mol% Y2O3). In both cases, the fractional model offers a consistent description of the experimental data showing that the high temperature internal friction background exhibits viscoelastic behaviour. The fractional parameter q increases with increasing temperature, which reflects the increasing role of a Newtonian fluid component in the viscoelastic relaxation.