|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Phenomenology of Viscosity and Transport in a Model Fragile Metallic Glass
||Peter Derlet, Hugo Bocquet, Robert Maass
|On-Site Speaker (Planned)
How thermally activated structural excitations quantitatively mediate transport and micro-plasticity in a model binary glass at the micro-second time-scale is revealed using atomistic simulation. It is found that such local excitations admit a far-field shear-stress signature and underlie the transport of free volume and bond geometry. Viscosity estimates are obtained giving a relaxation time-scale that is comparable to the strain recovery timescales seen in the micro-plasticity simulations. The transport is found to correspond to the evolution of a disclination network describing the spatial connectivity of topologically distinct bonding environments, demonstrating the important role of geometrical frustration in both glass structure and its underlying dynamics.
||Modeling and Simulation, Mechanical Properties, Computational Materials Science & Engineering