Thermodynamic re-assessment of the Al-Sn-Zn ternary system

J. Min. Metall. Sect. B-Metall. 55 (3) B (2019) 439-449. DOI:10.2298/JMMB190320036C
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Abstract

In this paper, a thermodynamic re-assessment of the Al-Sn-Zn ternary system was performed by means of the CALculation of PHAse Diagram (CALPHAD) approach. The thermodynamic descriptions of the binary Al-Sn, Al-Zn, and Sn-Zn systems from the literature were directly adopted, and the newly reported experimental phase equilibria, enthalpies of mixing, and activities of Al in the ternary liquid phase were taken into account. A set of self-consistent thermodynamic parameters for the ternary Al-Sn-Zn system were finally obtained. A comprehensive comparison between the presently calculated phase equilibria/thermodynamic properties and the experimental data indicates that the present thermodynamic descriptions of the ternary Al-Sn-Zn system show very good agreement with most of the experimental data. The further direct comparison with the calculated results due to the previous assessment demonstrates that a significant improvement was achieved by the present assessment though fewer ternary interaction parameters were utilized.
Keywords: Al-Sn-Zn ternary system; CALPHAD; Thermodynamic assessment; Phase equilibrium
Correspondence Address:
L.-J. Zhang, State Key Laboratory of Powder Metallurgy,
Central South University, Changsha, China
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