Theoretical Analysis of Thermodynamic Properties of Lu-Mg and Lu-Al Alloys
The mixing enthalpy,excess entropy,excess Gibbs free energy and the activity among all components of Lu-Mg and Lu-Al binary alloy melts were calculated using the Miedema model.According to the Butler's equation,the surface tensions of Lu-Mg and Lu-Al alloy melts and the content of all elements in the surface phase were calculated.The results indicate that the mixing enthalpy,excess entropy and excess Gibbs free energy of Lu-Mg and Lu-Al alloy melts are all negative.The activity of each component shows negative deviations compared to the ideal solution,indicating that Lu has stronger interaction with Mg and Al.The surface tensions of Lu-Mg and Lu-Al alloy melts decrease with the increase of Mg and Al content.Both Mg and Al elements are enriched towards the melt surface.
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