Kinetics of grain boundary segregation in multicomponent systems – The example of a Mo-C-B-O system. (June 2018)

• Record Type: Journal Article
• Authors: Scheiber, D.; Romaner, L.; Fischer, F.D.; Svoboda, J.
• Is Part Of: Scripta materialia. Number 150(2018)
• Page Start: 110
• Page End: 114
• Publication Date: 2018-06
• Subjects: Segregation -- Grain boundaries -- Diffusion -- Thermodynamics -- Kinetics; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.03.011
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A model for kinetics of segregation of several interstitial and substitutional components to different kinds of traps at grain boundaries is derived by applying the Thermodynamic Extremal Principle. Evolution equations for the site fractions of the segregating elements at the grain boundary, considered as independent variables, are presented and solved numerically. The kinetic model is applied to the case of Mo containing C, O, and B as impurities and a spectrum of trapping energies obtained from first principles simulations. This newly developed model offers an efficient tool for understanding segregation from several kinds of components at different types of traps. Graphical abstract: Unlabelled Image