Impact of severe plastic deformation on the relaxation of glassy and supercooled liquid states of amorphous Pd40Ni40P20

Hassanpour Afrouz, Hilke Sven, Rösner Harald, Divinski Sergiy V, Wilde Gerhard

Abstract

The impact of severe plastic deformation by high-pressure torsion on the relaxation of the glassy and supercooled liquid states of Pd40Ni40P20 was investigated using a combination of differential scanning calorimetry, low-temperature heat capacity, and fluctuation electronmicroscopy. The changes in the calorimetric signals due to deformation and subsequent heat treatments were analyzed and a correlationbetween deformation (rejuvenation) and annealing (relaxation) was found in relation to medium-range order (MRO). Moreover, acoupling between the occurrence of an exothermic peak in the supercooled liquid state and specific changes in the MRO types were identified.These findings are comprehended in a potential energy landscape scheme offering a new approach for MRO engineering of glasses.