Electronic-structure calculations of binary-alloy phase diagrams
- 1 April 1986
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 33 (7), 4782-4792
- https://doi.org/10.1103/physrevb.33.4782
Abstract
A short-range-order–dependent electronic theory of coherent phase equilibrium in substitutional binary alloys is presented. The alloy internal energy is calculated using the cluster-Bethe-lattice method. The configurational entropy is evaluated using the cluster variation method. This approach is parameter free and uses only the results of elemental electronic-structure calculations as input. It is shown that the configuration dependence of the enthalpy of formation can be described by concentration-dependent effective pair interactions. Equilibrium phase diagrams for the Cr-W, Cr-Mo, and Mo-W systems are presented. Other thermodynamic properties can also be obtained. As an example, we calculate the chemical activities and high-temperature enthalpy of formation for the Cr-Mo system. The predicted phase diagrams and related thermodynamic functions are in good agreement with available experimental data.Keywords
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