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Enthalpy of Mixing in Al-Tb Liquid

TitleEnthalpy of Mixing in Al-Tb Liquid
Publication TypeJournal Article
Year of Publication2017
AuthorsZhou, SH, Tackes, C, Napolitano, R
Date Published06
Type of ArticleArticle
ISBN Number1099-4300
Accession NumberWOS:000404454500052
KeywordsAl-Tb, amorphous-alloys, augmented-wave method, calorimetry, crystallization behavior, electromagnetic levitation, enthalpy, glass-forming ability, la binary-system, mixing, molecular-dynamics simulation, phase-equilibria, physics, rich metallic glasses, Short-range order, solution, thermodynamic properties

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.

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Structures and Dynamics