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Mean-field model for the growth and coarsening of stoichiometric precipitates at grain boundaries
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SYSNO ASEP 0352138 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Mean-field model for the growth and coarsening of stoichiometric precipitates at grain boundaries Author(s) Kozeschnik, E. (AT)
Svoboda, Jiří (UFM-A) RID, ORCID
Radis, R. (AT)
Fischer, F. D. (AT)Number of authors 4 Source Title Modelling and Simulation in Materials Science and Engineering. - : Institute of Physics Publishing - ISSN 0965-0393
Roč. 18, č. 1 (2010), Art. No. 015011Number of pages 19 s. Language eng - English Country GB - United Kingdom Keywords precipitation ; growth ; grain boundary Subject RIV BJ - Thermodynamics R&D Projects OC10029 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000272791800011 DOI 10.1088/0965-0393/18/1/015011 Annotation In this paper, a model for growth and coarsening of precipitates at grain boundaries is developed. The concept takes into account that the evolution of grain boundary precipitates involves fast short-circuit diffusion along grain boundaries as well as slow bulk diffusion of atoms from the grain interior to the grain boundaries. The mathematical formalism is based on a meanfield approximation, utilizing the thermodynamic extremal principle. The model is applied to the precipitation of aluminum nitrides in microalloyed steel in austenite, where precipitation occurs predominately at the austenite grain boundaries. It is shown that the kinetics of precipitation predicted by the proposed model differs significantly from that calculated for randomly distributed precipitates with spherical diffusion fields. Good agreement of the numerical solution is found with experimental observations as well as theoretical treatment of precipitate coarsening. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2011
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