Abstract
An attempt is made to analyse mathematically current theories of primary and secondary grain growth in sintered bodies, when pores act as grain-growth inhibitors. It is confirmed that the mechanism recently proposed by Kuczynski is quite possible, but in the light of existing knowledge such a mechanism should lead to a temporary suppression and subsequent resumption of primary recrystallization, rather than to primary and secondary recrystallization. The fact that primary and secondary recrystallization differ phenomenologically is emphasized and a strict similarity between impure crystalline metals and porous sintered bodies is suggested. This view is in good agreement with data recently obtained on uranium oxide.
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