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Abstract: The kinetics and microstructure of solid-phase crystallization undercontinuous heating conditions and random distribution of nuclei are analyzed.An Arrhenius temperature dependence is assumed for both nucleation and growthrates. Under these circumstances, the system has a scaling law such that thebehavior of the scaled system is independent of the heating rate. Hence, thekinetics and microstructure obtained at different heating rates differ only intime and length scaling factors.Concerning the kinetics, it is shown that theextended volume evolves with time according to alpha ex=expkappa Ct^m+1,where t- is the dimensionless time. This scaled solution not only represents asignificant simplification of the system description, it also provides newtools for its analysis. For instance, it has been possible to find ananalytical dependence of the final average grain size on kinetic parameters.Concerning the microstructure, the existence of a length scaling factor hasallowed the grain-size distribution to be numerically calculated as a functionof the kinetic parameters.



Autor: J. Farjas, P. Roura

Fuente: https://arxiv.org/







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