  Faceted grain boundaries exhibit unusual segregation and migration
tendencies. To gain a deeper understanding of how solute atoms interact with
faceted interfacial structures during migration, this study probes the
migration behavior of a faceted $\Sigma$11 boundary in Cu doped with Ag atoms.
The solutes are found to segregate to the facet with more free volume and
strongly reduce boundary velocity in one migration direction, but not the
other, due to the presence of a directionally-dependent motion mechanism that
can escape solute pinning and therefore speed up migration. Hence, a new
mechanism of chemically-induced anisotropy in grain boundary mobility is
uncovered by these simulations.
