Dresden 2003 – wissenschaftliches Programm

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M: Metallphysik

M 3: Symposium: Phasenumwandlungen in Schmelzen II

M 3.3: Vortrag

Montag, 24. März 2003, 12:15–12:30, IFW A

Liquid-liquid interfacial tension in immiscible Al-Bi system — •Walter Hoyer¹, Ivan Kaban¹, and Markus Merkwitz² — ¹TU Chemnitz, Institut für Physik, D-09107 Chemnitz — ²Wacker Siltronic, Berthelsdorfer Str. 113, D-09548 Freiberg
The liquid-liquid interfacial tension in the demixing Al-Bi system has been measured in a wide temperature interval. The method is based on experimental measurement of the force acting on the stamp detached to the interface and theoretical calculation of the shape of meniscus and its volume as a function of the contact line. The interfacial tension in the Al-Bi system at 933 K equals 66 mN/m. Its temperature dependence is similar to that in the Al-In and Al-Pb liquids and it is well described by the models of Cahn-Hillard and Chatain-Eustathopoulos. The absolute value of the liquid-liquid interfacial tension at the monotectic point has also been calculated with the help of different semi-empirical and theoretical models. Analysis of the model predictions in comparison with the experimental data has been perform