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• W2017396876 abstract "When performing thermodynamic calculations at temperatures outside the temperature range where the liquid is the stable phase and where its properties can be measured, it is important to extrapolate the properties in a reasonable way. Many different methods have been proposed over the years. The methods are based on various approximations on how the difference in heat capacity between the liquid and the solid ΔCPL−S varies with temperature T. The simplest approach is ΔCPL−S = 0 or perhaps a constant value. Both of these approximations have recently been used by Murray and by Hayes et al. in their evaluations of the thermodynamic properties of the AgCu system. As these approximations are known to be less satisfactory for large supercoolings we have re-evaluated the thermodynamic properties of the AgCu system by applying a new model, recently presented by Ågren. It is a phenomenological model suitable for the thermodynamic description of a highly undercooled liquid. The new model, previously applied only to pure elements, was extended here to alloy melts. After having established a sound thermodynamic basis of the AgCu system the kinetics of solidification were considered. We calculated the growth rate of a dendritic tip, taking into account the effect of interface kinetics, the Gibbs-Thomson effect and the so-called solute-drag effect. This allowed us to model the transition from diffusion-controlled growth, occurring at low supersaturations, to diffusionless growth, occurring at high supersaturations. It was found that when the ratio between the solute mobility at the interface and the solute diffusivity in the liquid was small the transition occurred close to the so-called T0 line. However, if the ratio was large the transition to diffusionless growth occurred close to the solidus." @default.
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• W2017396876 date "1988-12-01" @default.
• W2017396876 modified "2023-10-16" @default.
• W2017396876 title "Thermodynamic and kinetic aspects of crystallization of supercooled AgCu liquids" @default.
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• W2017396876 doi "https://doi.org/10.1016/0022-5088(88)90272-x" @default.
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