Self-organized Criticality Behavior in Bulk Metallic Glasses

Abstract

Serrated flows are known as repeated yielding of bulk metallic glasses (BMGs) during plastic deformation under different loading conditions, which are associated with the operation of shear banding. According to the statistics of some parameters, the shear avalanches can display a self-organized critical state, suggesting a large ductility of BMGs. The emergence of the self-organized criticality (SOC) behavior in different BMGs is due to the temperature, strain rate, and chemical compositions. The SOC behavior is accompanied with the following phenomena: the interactions occur in the shear bands; the incubation time is longer than the relaxation time; the time interval is lacking of typical time scale; and the spatial or temporal parameters should display a power-law distribution.