Aspect ratio effects on the serration dynamics of a Zr-based bulk metallic glass

Abstract

Based on the constant strain rate compressive experiments to a Zr-based bulk metallic glass, the aspect ratio effects on the statistical properties of serration is systematically investigated. In the plastic deformation state, as the aspect ratio decreases, the stress drop magnitude increases dramatically and the reloading time in one serration event increases significantly. Moreover, distribution of the elastic energy density of each serration event is predicted, which obeys the squared exponential decay law. The size effect law is adopted to describe the serration dynamic-related parametric variation with different aspect ratios. It is noted that the scaling exponent reduces with the increase of the aspect ratio. In general, the effect of aspect ratio on the serration flow could be explained by the shear-band stability index.