  A three-dimensional atomistic Kinetic Monte Carlo model was developed and
used to study the interaction between mobile solutes and a migrating interface.
While the model was developed with a simplified energetic and topological
description, it was also constructed to capture, in the absence of solute, the
Burke-Turnbull model for interface migration and, in the presence of solutes,
solute segregation to different types of interface sites. After parameterizing
the model, simulations were performed to study the relationship between average
interface velocity and imposed driving pressure for varying solute
concentration and solute diffusivity. While the effect of solute concentration
on solute drag pressure was found to be consistent with classical solute drag
models, the effect of solute diffusivity was found to give a response not
captured by either continuum or previously reported two-dimensional atomistic
models. The dependence of maximum drag pressure on solute diffusivity was
observed and attributed to the coupling between the structure of a migrating
interface and the ability for solute to remain segregated to the interface.
