Critical evaluation and optimization of the thermodynamic properties and phase diagrams of the Al-Mg, Al-Sr, Mg-Sr, and Al-Mg-Sr Systems |
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Authors: | P Chartrand and A D Pelton |
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Affiliation: | (1) Centre de Recherche en Calcul Thermochimique Ecole Polytechnique, Station "Centre Ville", P.O. Box 6079, H3C 3A7 Montreal, Quebec, Canada |
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Abstract: | All available thermodynamic and phase diagram data were critically assessed for all phases in the Al-Mg, Al-Sr, and Mg-Sr
systems at 1 bar pressure from room temperature to above the liquidus temperatures. For these systems, all reliable data were
simultaneously optimized to obtain a set of model equations for the Gibbs energy of the liquid alloy and all solid phases
as functions of composition and temperature. The modified quasi-chemical model was used for the liquid. The Al-Mg-Sr ternary
phase diagram was calculated from the optimized thermodynamic properties of the binary systems. Since no reliable ternary
data were available, three assumptions were made: no ternary terms were added to the model parameters for the thermodynamic
properties of the liquid, no ternary solid solutions are present in the system, and no ternary compound is present in the
system. The calculated ternary phase diagram is thus a first approximation, which can be improved by the addition of new experimental
data and can be used as a base for the calculation of phase diagrams of multicomponent systems. |
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