Kinetics of interstitial segregation in Cottrell atmospheres and grain boundaries |
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| Authors: | J. Svoboda G.A. Zickler E. Kozeschnik |
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| Affiliation: | 1. Institute of Physics of Materials, Academy of Science of the Czech Republic, ?i?kova 22, 616 62 Brno, Czech Republic;2. Institute of Mechanics, Montanuniversit?t Leoben, Franz-Josef-Strasse 18, 8700 Leoben, Austria;3. Institute of Materials Science and Technology, Vienna University of Technology, Favoritenstrasse 9-11/E308, 1040 Vienna, Austria |
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| Abstract: | Trapping of interstitial (e.g. carbon) atoms is driven by the reduction in energy in the system. Diffusion of interstitials, together with their trapping in dislocation cores and/or grain boundaries, is studied by the thermodynamic extremal principle. In addition to the total Gibbs energy, a well-established formulation of the total dissipation is applied. Dimension-free evolution equations are derived, whose solution is well approximated by an easy to handle kinetic equation. Cottrell’s power law can be verified in the initial stage. |
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| Keywords: | segregation grain boundaries dislocations simulation thermodynamic extremal principle |
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