Abstract
The high – and low-temperature relaxations in Zr – based bulk metallic glasses (BMGs) were investigated in terms of volume relaxation. Both relaxations exhibited the decrease of volume during the relaxation, and their behaviors were well described with a stretched exponential relaxation function. The kinetics of high-temperature relaxation was represented by a Vogel-Fulcher-Tammann equation for the relaxation time and by Kohlrausch indices linearly increased with temperature. On the other hand, the kinetics of low-temperature relaxation for respective Zr55Cu30Ni5Al10 BMG was characterized by an Arrhenius type temperature dependence of the relaxation time, and by almost constant value of Kohlrausch index. Consequently, the high – and low-temperature relaxations were regarded as α – relaxation and slow β – relaxation reported for dynamical measurements of the structural relaxation, respectively.
