Abstract
A model of grain boundary (GB) diffusion along an isolated moving GB is proposed based on the Fisher model. The GB is assumed to move with a constant velocity v. Analytical solutions of the model are obtained, and methods of GB diffusion parameters determination in different experimental conditions are discussed. Application of conventional methods, like the 6 5 - method , to moving GBs results in essentially (by a factor of about 1 2 vt( Dt) − 1 2 underestimated values of the product D′ δ. For more correct estimation of D′ δ, the proposed exponential solution should be used in such cases. A detailed classification of kinetic regimes in a bicrystal, containing stationary and moving GBs, is introduced. A kinetic diagram, useful in designing GB diffusion experiments, is proposed.
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