منابع مشابه
Microscopic treatment of solute trapping and drag.
The long wavelength limit of a recent microscopic phase-field crystal (PFC) theory of a binary alloy mixture is used to derive an analytical approximation for the segregation coefficient as a function of the interface velocity, and relate it to the two-point correlation function of the liquid and the thermodynamic properties of solid and liquid phases. Our results offer the first analytical der...
متن کاملSolidification Fronts and Solute Trapping in a Binary Alloy
A phase field model with order parameter, concentration, and temperature as field variables is used to study the properties of solidification fronts in a binary alloy. As in previous papers, the model includes dependence of the free energy density not only on these field variables, but also on the gradients of the order parameter and concentration. Terms with these gradients represent surface f...
متن کاملSolute trapping and solute drag in a phase-field model of rapid solidification
During rapid solidification, solute may be incorporated into the solid phase at a concentration significantly different from that predicted by equilibrium thermodynamics. This process, known as solute trapping, leads to a progressive reduction in the concentration change across the interface as the solidification rate increases. Theoretical treatments of rapid solidification using traditional s...
متن کاملSolute trapping and diffusionless solidification in a binary system.
Numerous experimental data on the rapid solidification of binary systems exhibit the formation of metastable solid phases with initial (nominal) chemical composition. This fact is explained by complete solute trapping leading to diffusionless (chemically partitionless) solidification at a finite growth velocity of crystals. Special attention is paid to developing a model of rapid solidification...
متن کاملScaling analysis of convective solute transport and segregation in Bridgman crystal growth from the doped melt
2014 Convective transport is well known to have a decisive influence on the macrosegregation encountered in metallic or semi-conductor crystals grown from an impure or doped melt. In the present paper, this problem is studied with the help of an order of magnitude analysis of the set of balance equations for mass, momentum and solute in the melt and at the growth interface. The different solute...
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ژورنال
عنوان ژورنال: MRS Proceedings
سال: 1983
ISSN: 0272-9172,1946-4274
DOI: 10.1557/proc-23-369