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Thermodynamics of the α-AuZn and β′-AuZn phases

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Abstract

Thermodynamic data of theα-AuZn alloys recently reported in the literature are found to follow closely the sub-regular solution model. Values of the two parameters for this model are found to increase linearly with temperature. Using theα-phase data, the established(α + β′) phase boundaries, the thermodynamic activities of Zn in theβ′-phase, the theoretical equations of Chang and co-workers for ordered phases and the calorimetric value of the stoichiometric alloy, the thermodynamic properties of β1-AuZn alloys are obtained. It is found that the thermal entropy of the β1-AuZn phase is essentially independent of composition, verifying one of the assumptions made in the theoretical equations of Chang and co-workers. The large discrepancies between the three sets of experimental data for β′-AuZn phases are discussed and best consistent results are reported.

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Authors and Affiliations

  1. Materials Department, College of Engineering and Applied Science, University of Wisconsin-Mulwaukee, 53201, Milwaukee, Wisc.

    S. Kou (Research Assistant) & Y. A. Chang (Professor and Chairman)

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  1. S. Kou
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  2. Y. A. Chang
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Kou, S., Chang, Y.A. Thermodynamics of the α-AuZn and β′-AuZn phases. Metall Trans A 6, 39–44 (1975). https://doi.org/10.1007/BF02673668

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