Modeling of non-equilibrium solute diffusion upon rapid solidification: effective mobility versus kinetic energy. (October 2015)

• Record Type: Journal Article
• Authors: Wang, H.; Lai, C.; Zhang, X.; Kuang, W.; Liu, F.
• Is Part Of: Materials science and technology. Volume 31:Number 13b(2015:Dec.)
• Page Start: 1649
• Page End: 1657
• Publication Date: 2015-10
• Subjects: Solute diffusion, -- Thermodynamics, -- Kinetics, -- Rapid solidification, -- Theory; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1179/1743284715Y.0000000046
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : The effective mobility approach is compared with the kinetic energy approach in terms of sharp interface modeling and phase-field modelling of non-equilibrium solute diffusion upon rapid solidification of binary alloys. The two approaches are equivalent for modelling of long range solute diffusion in bulk phases, but only the effective mobility approach can introduce the non-equilibrium solute diffusion effect to short range solute diffusion at a sharp interface or within a diffuse interface. Addition of the kinetic energy terms results in an unreasonable non-bilinear expression of the flux and thermodynamic driving force in the free energy production of interface migration or phase field propagation, whereas the effective mobility approach allows the thermodynamic extremal principle workable.