Measurement of Disconnection Mobility via Generalized Interfacial Fault Energies

Barrett, C. D., & El Kadiri, H. (2016). Measurement of Disconnection Mobility via Generalized Interfacial Fault Energies. International Journal of Plasticity. IJP International Conference on Plasticity, Damage, and Fracture. Keauhou Bay, HI.

The generalized stacking fault energy has provided a robust and accurate atomic scale metric for dislocation mobility. However, this method is inapplicable to twinning dislocations and other grain boundary disconnections which provide boundary mobility in addition to mediating shear. Here we present a new metric which is conceptually similar to the generalized stacking fault energy, but applicable to grain boundary defects. The mobilities of common hexagonal close-packed twin boundaries are compared to demonstrate the viability of the new metric, novelly demonstrating quantitatively why {10-12} disconnections are significantly more mobile than {10-11} disconnections