Entropy model for flow behavior in metallic glasses

A model based on configurational entropy is proposed to interpret phenomenologically the flow behavior in metallic glasses. From available thermal and viscosity measurements, the effect of temperature, strain rate, pressure and composition on flow stress of metallic glasses have been evaluated. The values calculated agree fairly well with experimental data. The failure of atomic rearrangements to relieve the imposed strain results in stress concentrations and local structural disorder at deformed regions. This leads to inhomogeneous flow and softening of the metallic glasses.