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Modelling for hydrogen diffusion in metals with traps revisited
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SYSNO ASEP 0369684 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Modelling for hydrogen diffusion in metals with traps revisited 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. 60, č. 3 (2012), s. 1211-1220Number of pages 10 s. Language eng - English Country GB - United Kingdom Keywords Hydrogen ; Effective diffusivity ; Trapping Subject RIV BJ - Thermodynamics R&D Projects GAP204/10/1784 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000301157900042 DOI 10.1016/j.actamat.2011.11.025 Annotation A rigorous concept for diffusion of hydrogen is presented that allows for the role of trapping and/or hydrostatic stress. Nonlinear partial differential equations for the concentration of freely diffusing hydrogen in the lattice and for the total concentration of hydrogen both in the lattice and traps are derived. A generalized chemical diffusion coefficient can be deduced and is compared with reported relations from the literature. Simulation results are presented for different amounts of traps and their different energetic levels (depths), both for hydrogen concentration profiles and the total amount of hydrogen in the case of charging or discharging a cylindrical specimen. A significant charging/discharging asymmetry occurs for high hydrogen concentrations and high amounts of traps of sufficient depth. Comparisons of the chemical diffusion coefficient with experimental results from the literature are also presented. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2012
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