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

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.

Thermodynamic assessment of the Co-Mg binary system

“…Table 1 summarizes the experimental phase diagram and thermodynamic data in the literature [10,11,13,25]. Table 2 lists the thermodynamic parameters obtained in the present work by using the PARROT module of the Thermo-Calc software [30], which is based on minimizing the sum of squares of the differences between the experimental values and the computed ones [31,32]. In the process of optimization, each piece of experimental information was given a certain weight, which can be changed in view of the experimental errors.…”

An Effective Strategy to Maintain the CALPHAD Atomic Mobility Database of Multicomponent Systems and Its Application to Hcp Mg–Al–Zn–Sn Alloys

“…The thermodynamic descriptions for the Mg–Al–Zn–Sn quaternary system from our previous publications [ 39 , 40 , 41 ] were directly employed in the present work for providing accurate thermodynamic properties. In the following, the atomic mobilities in the hcp Mg–Al–Zn and hcp Mg–Al–Sn ternary systems were first updated by fixing the atomic mobilities in boundary binaries, from which the atomic mobility database in the hcp Mg–Al–Zn–Sn quaternary system was then established.…”