Abstract
The treatment of grain growth as a diffusion-drift process in time size space has recently received renewed attention. In the present paper we emphasize that the grains move in only one dimension in time-size space, while in the diffusion-drift model introduced by Pande and Dantsker [ Acta metall. mater. 38, 945 (1990)], the grains are allowed to move in 1, 2 and 3 dimensions. We also demonstrate that their theory predicts grain size distribution functions that do not satisfy all the requirements normally attributed to such functions.
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