Kinetics of structural relaxation in bulk metallic glasses by mechanical spectroscopy: Determination of the stretching parameter βKWW

► Structural relaxation in BMG leads to an increase of G′ and a decrease of the loss factor. ► The Kohlrausch exponent βKWW does not depend on annealing temperature and so on the microstructure. ► Decrease in the loss factor is due to a decrease in the atomic mobility.