Free volume simulation for severe plastic deformation of metallic glasses

Evolution of internal parameters of metallic glasses subjected to high pressure torsion was simulated using a free volume based thermo-mechanical model. Steady state has been predicted in the whole, plastically sheared volume for large strains irrespectively from the applied revolution rate. Based on the simplification of the model equations in steady state, simple methods were obtained to determine the in situ temperature increase and stress distribution from external torque measurements.

► Thermo-mechanical simulation for the severe plastic deformation of metallic glasses.
► Steady state is reached for large strains.
► Free volume evolution of metallic glass sample in high pressure torsion.
► External torque measurements can determine variation of glass parameters in situ.