Local non-equilibrium effect on the growth kinetics of crystals. (15th April 2019)

• Record Type: Journal Article
• Authors: Galenko, P.K.; Ankudinov, V.
• Is Part Of: Acta materialia. Volume 168(2019)
• Page Start: 203
• Page End: 209
• Publication Date: 2019-04-15
• Subjects: Phase interface -- Growth kinetics -- Phase field model; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2019.02.018
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: A phase field model for small and large driving forces on solidification and melting of a pure metal or binary alloy is formulated. A traveling wave solution of the phase field equation predicts the non-linear behavior in the velocity of the crystal/liquid interface at the large driving force. This non-linearity has the dependence of velocity with saturation or exhibiting the velocity with maximum at a fixed undercooling/superheating. The predicted velocity is compared with the molecular dynamics simulation data for pure Fe that confirms a crucial role of local non-equilibrium in the form of relaxation of gradient flow in the quantitative description of the crystal growth kinetics. Graphical abstract: Image 1