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Título:	On the validity of Avrami formalism in primary crystallization
Autor/a:	Bruna Escuer, Pere; Crespo Artiaga, Daniel; González Cinca, Ricardo; Pineda Soler, Eloi
Otros autores:	Universitat Politècnica de Catalunya. Departament de Física Aplicada; Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials
Abstract:	Calorimetric data of primary crystallization is usually interpreted in the framework of the Kolmogorov Dokl. Akad. Nauk SSSR 1, 355 1937 , Johnson and Mehl Trans. AIME 135, 416 1939 , and Avrami J. Chem. Phys. 7, 1103 1939 ; 8, 212 1940 ; 9, 177 1941 KJMA theory. However, while the KJMA theory assumes random nucleation and exhaustion of space by direct impingement, primary crystallization is usually driven by diffusion-controlled growth with soft impingement between the growing crystallites. This results in a stop of the growth before the space is fully crystallized and induces nonrandom nucleation. In this work, phase-field simulations are used to check the validity of different kinetic models for describing primary crystallization kinetics. The results show that KJMA theory provides a good approximation to the soft-impingement and nonrandom nucleation effects. Moreover, these effects are not responsible of the slowing down of the kinetics found experimentally in the primary crystallization of glasses.
Abstract:	Peer Reviewed
Materia(s):	-Àrees temàtiques de la UPC::Física::Termodinàmica::Canvis d'estat -Crystallization -cristallization -Cristal·lització
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Tipo de documento:	Artículo - Versión publicada Artículo
Editor:	American Institute of Physics
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