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Recent data on abnormal grain growth are also considered.
Also, an abnormal grain growth is observed which is accompanied with the appearance of CG seats or centers absorbing their smaller neighbors as it is in Fig. 2.2 with possible formation of a new bimodal GS distri- bution.
Such abnormal grain growth is also characteristic in some NMs produced by
The numerical models of nanoparticle movement during GBs migration have revealed some dualism in a nanostructure evolution, which consists in the fact that the nanoparticles presence (depending on their volume content and total GBs migration) not only can decrease grain mobility, but also assists its increase leading to an abnormal grain growth [8, 9].
Let us notice that there are many situations when GG (in particular, an abnormal grain growth; see Fig. 2.2) in NMs cannot be prevented even at room temperature.
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