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Unraveling the nature of room temperature grain growth in nanocrystalline materials

✍ Scribed by Markus Ames; Jürgen Markmann; Rudolf Karos; Andreas Michels; Andreas Tschöpe; Rainer Birringer

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
1010 KB
Volume
56
Category
Article
ISSN
1359-6454

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✦ Synopsis

We report on the observation of real-time-resolved room temperature grain growth in nanocrystalline metals. We find that neither the time evolution of size can be modeled by standard growth theories nor are there any other systems aware to us that manifest a similar growth behaviour. We detect a transition from an initially self-similar slow growth to abnormal grain growth. Its onset seems to be associated with the simultaneous decrease of microstrain with increasing grain size. Abnormal grain growth is considered as a generic feature of nanocrystallinity but is a transient state since we observed in the late stage of coarsening, using orientational imaging microscopy, a monomodal grain size distribution. We empirically find a nonlinear-response-type of growth law which is in agreement with the observed coarsening kinetics.

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