THEORY OF PHASE SEPARATION IN LIQUID METAL ALLOYSReport as inadecuate




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Abstract : The critical point for phase separation in liquid alloys of nearly-free-electron metals is determined by two different methods. The first involves a variational approach in which the Helmholtz free energy of the alloy is expressed in terms of hard-sphere structure factors and entropy. The phase boundary is then found by a common tangent construction applied to the free energy isotherms. In the second approach, the long-wavelength concentration fluctuations are calculated within a meanfield approximation. The divergence of these fluctuations is then used as a criterion to determine the critical point. Both methods lead to critical points in satisfactory agreement with experiment in a number of binary alloys, and in addition suggest systematic relations between the phase boundary and such parameters as effective ionic diameters, atomic volumes, and valency differences between the alloy constituents.





Author: D. Stroud

Source: https://hal.archives-ouvertes.fr/



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