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Nanocrystallization kinetics understood as multiple microprocesses following the classical theory of crystallization

AuthorsManchón-Gordón, A. F.; Blázquez, J. S.; Conde, C. F.; Conde, A.
KeywordsNanocrystalline materials
Avrami exponent
Issue Date5-Aug-2016
CitationJournal of Alloys and Compounds 675: 81-85 (2016)
AbstractIn this work, we propose a model for using the classical Johnson-Mehl-Avrami-Kolmogorov (JMAK) crystallization theory to analyze nanocrystallization processes as a set of multiple microprocesses. This model is based on the well-known microstructure observations of nanocrystalline systems for which, although the number of crystallites increases along the process, the growth of each crystallite is limited to a much shorter time than the needed one for completing the process. The very low values of the Avrami exponent, n∼1, are well reproduced assuming a set of multiple classical JMAK processes with constant nucleation rate and diffusion controlled growth, n = 2.5 for each i individual microprocess. It is shown that the values of Avrami exponent experimentally observed and lying out of the theoretical range can be assumed as effective values derived from a complex process consisting of multiple microprocesses, which can be individually treated as classical ones.
Publisher version (URL)https://doi.org/10.1016/j.jallcom.2016.03.087
Appears in Collections:(ICMS) Artículos
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