The thermodynamic properties of ternary Al‐Cu‐Zn alloys containing 25 to 62 at % Al have been determined by electromotive force (EMF) measurements between 420 and 920°C by an aluminum concentration cell of the type Al [ AlCl 3 ‐ LiCl ‐ KCl ] alloy. This concentration cell was evaluated via comparison with known partial free energy for Al measured in liquid Al‐Cu alloys by Wilder, and several liquidus temperatures of Al‐Cu phase diagram have been determined. From EMF values, activities of Al with respect to mole fraction of Al in ternary Al‐Cu‐Zn alloys for three quasi‐binary sections ( x Cu / x Zn = 7 / 3 , 1 , and 3 / 7 ) at 850°C were determined. The negative deviation from Raoultian behavior observed was more pronounced at high x Cu / x Zn ratios in agreement with binary Al‐Zn and Al‐Cu phase diagrams.
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Van et al. (1994) studied this question.
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