Dresden 2011 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 12: Postersitzung I

MM 12.6: Poster

Monday, March 14, 2011, 17:30–19:00, P5

Investigation of the viscosity for Bi-Sn(Zn) liquid alloys — •Andriy Yakymovych, Oleg Volkov, and Petro Yakibchuk — Department of Metal Physics, Ivan Franko National University of Lviv, Lviv, Ukraine

In the present study we have determined the viscosity with use of expressions for a polydisperse hard-sphere fluid (theory) and the high-temperature viscometer (experiment). According to the used theory, we present atoms in binary metallic alloy as a mixture of two subsystems of polydisperse hard spheres which interacts each other via contact potential only. Such assumptions lead us to the fact that we can express viscosity of this system using analytical equations and integrals they contains can be presented by simple mathematic functions for well-defined size distributions of polydisperse particles or by simple numeric scheme in general. Studding different cases of size-distribution in one-component systems we found that viscosity limit (value of average hard sphere volume fraction when viscosity turns to infinity) slightly moves down to zero.

In this work we provide calculations for binary alloys and try to analyze our results by comparison them with real alloys. The experimental measurements were carried out by a torsional oscillation viscometer. The viscosity of Bi-Sn liquid alloys has been studied in the vicinity of eutectic concentration and in vicinity of the demixing curve for Bi-Zn system, respectively.