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Open AccessArticle

Enthalpy of Mixing in Al–Tb Liquid

1
Division of Materials Science and Engineering, Ames Laboratory, United States Department of Energy, Ames, IA 50011, USA
2
Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA
*
Author to whom correspondence should be addressed.
Entropy 2017, 19(6), 290; https://doi.org/10.3390/e19060290
Received: 10 April 2017 / Revised: 14 June 2017 / Accepted: 15 June 2017 / Published: 21 June 2017
(This article belongs to the Special Issue Thermodynamics in Material Science)
The liquid-phase enthalpy of mixing for Al–Tb alloys is measured for 3, 5, 8, 10, and 20 at% Tb at selected temperatures in the range from 1364 to 1439 K. Methods include isothermal solution calorimetry and isoperibolic electromagnetic levitation drop calorimetry. Mixing enthalpy is determined relative to the unmixed pure (Al and Tb) components. The required formation enthalpy for the Al3Tb phase is computed from first-principles calculations. Based on our measurements, three different semi-empirical solution models are offered for the excess free energy of the liquid, including regular, subregular, and associate model formulations. These models are also compared with the Miedema model prediction of mixing enthalpy. View Full-Text
Keywords: Al–Tb; mixing; enthalpy; electromagnetic levitation; solution calorimetry Al–Tb; mixing; enthalpy; electromagnetic levitation; solution calorimetry
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Zhou, S.; Tackes, C.; Napolitano, R. Enthalpy of Mixing in Al–Tb Liquid. Entropy 2017, 19, 290.

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