A flow model in bulk metallic glasses

Based on the microscopic mechanisms applicable to bulk metallic glasses (BMGs), such as free-volume theory and fracture of brittle solids, a constitutive equation for crack-like propagation velocity shear bands in BMGs is deduced, νSBcl=ν0a0exp(−ES/kT). Furthermore, flow model monolithic successfully established, logνSB=log(ν0a0)+logeES/(kTl)−logeES/(kT). The explains clearly fundamental deformation at temperature far below liquidus temperature, i.e., mechanism serrated flows. Not only does accurately predict transition between non-serrated flows, but Arrhenius activation energy received by current most are consistent with experimental results. study paves way plastically process BMGs, avoiding catastrophic plasticity instability.