Abstract
Experimental evidence is presented, showing that gram boundary motion can be induced by changing the composition by means of grain boundary diffusion. The experiments were carried out by treating specimens of pure iron in an atmosphere of zinc or iron-zinc specimens in an atmosphere with a lower zinc potential. The reaction resembles the grain boundary migration in discontinuous precipitation and provides an experimental method of isolating grain boundary migration for study. The experimental results can be used to evaluate rather directly the grain boundary diffusivity and mobility. The diffusivities thus obtained are several orders of magnitude larzer than the values reported for stationary boundaries. It is concluded that the boundary diffusivity is greatly enhanced by grain boundary motion.
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