Scale-Bridging Thermodynamic and Kinetic Simulation (STKS)
Probing the degree of heterogeneity within a shear band of a model glass
M. R. Hassani, A. Lagogianni, F. Varnik.
Physical Review Letters, 123, 195502, (2019)
Recent experiments provide evidence for density variations along shear bands in metallic glasses with a length scale of a few hundred nanometers. Via molecular dynamics simulations of a generic binary glass model, here we show that this is strongly correlated with variations of composition, coordination number, viscosity, and heat generation. Individual shear events along the shear band path show a mean distance of a few nanometers, comparable to recent experimental findings on medium range order. The aforementioned variations result from these localized perturbations, mediated by elasticity.
Keyword(s): plasticity; amorphous materials; metallic glasses; condensed matter