2021-09-16T18:54:43Z
http://digital.csic.es/dspace-oai/request
oai:digital.csic.es:10261/190896
2019-09-27T10:58:03Z
com_10261_98
com_10261_3
col_10261_351
Manchón-Gordón, A. F.
Blázquez, J. S.
Conde, C. F.
Conde, A.
2019-09-17T10:21:50Z
2019-09-17T10:21:50Z
2016-08-05
Journal of Alloys and Compounds 675: 81-85 (2016)
0925-8388
http://hdl.handle.net/10261/190896
http://dx.doi.org/10.1016/j.jallcom.2016.03.087
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100003329
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.
eng
closedAccess
Nanocrystalline materials
Avrami exponent
Kinetics
Nanocrystallization kinetics understood as multiple microprocesses following the classical theory of crystallization
artículo