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Modelling of the Influence of Sources and Sinks for Vacancies and Stress State on Diffusion in Crystalline Solids
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SYSNO ASEP 0363693 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Modelling of the Influence of Sources and Sinks for Vacancies and Stress State on Diffusion in Crystalline Solids Author(s) Svoboda, Jiří (UFM-A) RID, ORCID
Fischer, F. D. (AT)Number of authors 2 Source Title Acta Materialia. - : Elsevier - ISSN 1359-6454
Roč. 59, č. 3 (2011), s. 1212-1219Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords Substitutional diffusion ; Vacancies ; Annihilation Subject RIV BJ - Thermodynamics R&D Projects GAP204/10/1784 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000286690100036 DOI 10.1016/j.actamat.2010.10.054 Annotation Diffusion in solids is a well-known phenomenon that has many consequences in technology and material science. Modelling of diffusion- controlled processes requires both a reliable theory of diffusion and reliable kinetic coefficients, as well as other thermodynamic data. Often the classical Darken theory, valid for stress-free systems with ideal vacancy source and sink activity, is generalized to multicomponent systems with ideal vacancy source and sink activity. Nazarov and Gurov presented a theory for stress-free systems with no vacancy source and sink activity. Recently we published a general theory of diffusion that accounted for the role of non-ideal vacancy source and sink activity, as well as the stress state. Since diffusion theories are tested and diffusion coefficients measured usually on diffusion couples, this paper presents evolution equations based on that general theory for a diffusion couple. In the limit, the equations of the Darken theory and the Nazarov and Gurov theory are valid for ideal vacancy source and sink activity and no vacancy source and sink activity, respectively. Simulations for binary and ternary diffusion couples demonstrate the influence of the vacancy source and sink activity and the stress state on evolution of site fraction profiles of components and vacancies, and on the Kirkendall effect. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2012
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