Dresden 2006 – scientific programme
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MM: Metall- und Materialphysik
MM 25: Poster Session
MM 25.27: Poster
Wednesday, March 29, 2006, 15:30–17:30, P4
Liquid-Liquid Interfacial Tension in Ternary Al-Bi-Cu Alloys — •Ivan Kaban and Walter Hoyer — Chemnitz University of Technology, Institute of Physics, D-09107 Chemnitz, Germany
Al-based monotectic alloys are considered as potential candidates for advanced bearings in car engines. Therefore a large number of various experimental investigations have been carried out in order to become proficient in casting of these alloys. However surprisingly it is, there exist virtually no experimental data on the physical property playing a crucial role in the demixing and solidification processes - liquid-liquid interfacial tension.
In this work we study the phase separation phenomenon in the ternary Al-Bi-Cu system, which is characterized by a very large miscibility region in the liquid state. The temperatures of the monotectic reactions, density difference of the coexisting phases and liquid-liquid interfacial tension in the ternary alloys Al100−xCuxBi65.5 (wt.%) are determined in wide temperature and composition ranges. The method is based on the experimental measurement of the force exerted on a stamp detached to the liquid-liquid interface and determination of the meniscus volume, on the one hand, and the theoretical calculation of the shape of meniscus and its volume as a function of the contact line, on the other hand.
It is established that the interfacial tension gradually increases when Al is substituted by Cu in the ternary Al100−xCuxBi65.5 alloys. The temperature dependences of the interfacial tension for the studied alloys show a behaviour similar to that in the binary Al-Bi monotectic system.