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Título: | Nanocrystallization kinetics understood as multiple microprocesses following the classical theory of crystallization |
Autor: | Manchón-Gordón, Alejandro F.; Blázquez, J. S.; Conde, C.F.; Conde del Campo, Ana | Palabras clave: | Nanocrystalline materials Avrami exponent Kinetics |
Fecha de publicación: | 5-ago-2016 | Editor: | Elsevier | Citación: | Journal of Alloys and Compounds 675: 81-85 (2016) | Resumen: | In 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. | Versión del editor: | https://doi.org/10.1016/j.jallcom.2016.03.087 | URI: | http://hdl.handle.net/10261/190896 | DOI: | 10.1016/j.jallcom.2016.03.087 | ISSN: | 0925-8388 |
Aparece en las colecciones: | (ICMS) Artículos |
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