The theoretical treatments of the solute drag effect are reviewed and the result of some calculations are compared. It is suggested that the result depends critically upon the details in the model used for describing the properties of the grain boundary. The introduction of atomistic features in the previous treatments which have been of a continuous nature is discussed. It is pointed out that sideways grain boundary diffusion of the solute can lead to a decrease of the drag and even provide a driving force for the grain boundary migration. Such an experiment indicates that the structure of a migrating boundary may be quite different from a stationary boundary.
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