Nonlinear effects on impurity segregation in edge dislocation strain fields

Elastic field coupling to solute concentration is known to produce dislocation-driven impurity segregation. Recent reports detailing the distribution of boron around edge dislocations in B2-ordered FeAl indicate that nonlinear coupling of species concentration and elastic strain to the chemical potential must be considered to assess the magnitude of boron segregation around edge dislocations. One type of nonlinear coupling spatially shifts the solute distribution relative to the dislocation strain field, while another maintains the centers of the respective distributions.