Berlin 2008 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 2: SYM Phase Transformations in Metallic Melts I

MM 2.2: Vortrag

Montag, 25. Februar 2008, 10:45–11:00, H 1058

Liquid-liquid interfacial tension in multicomponent immiscible Al-based alloys — •Walter Hoyer¹ and Ivan Kaban² — ¹Technische Universität Chemnitz, Institut für Physik, 09107 Chemnitz — ²Technische Universität Chemnitz, Institut für Physik, 09107 Chemnitz

Liquid-liquid interfacial tension and density difference of the coexisting phases have been determined in wide temperature and composition ranges in binary Al-Bi, ternary Al-Bi-Cu, Al-Bi-Si, Al-Bi-Sn and quaternary Al-Bi-Cu-Sn alloys.

It is found that the interfacial tension between Al-rich and Bi-rich liquid phases increases when either Cu or Si is added and it decreases when Sn is added. Simultaneous addition of Cu and Sn in equal quantity results in a decrease of the interfacial tension at low temperature and in its increase at high temperature. Temperature dependences of the interfacial tension in all alloys studied are well described by the function σ_{α β} = σ₀ (1−T/T_C)^µ with a constant σ₀ and the critical point exponent µ = 1.3.