Comparison of Different Theoretical Models to Experimental Data on Viscosity of Binary Liquid Alloys

Abstract

Six different theoretical equations are compared in the present paper with experimental data, measured for 28 binary liquid metallic systems. General conclusions are drawn on the ability of the different theoretical models to describe the concentration and temperature dependence of the viscosity of liquid alloys. A new equation is derived, being able to predict the viscosity in multicomponents alloy even if the viscosities of the pure components are not known.

Bulk and Surface Properties of Liquid Al-Li and Li-Zn Alloys

“…Positive deviation from linearity in the viscosity isotherm has been observed for Li-Zn system. The computed viscosities using Kucharski model give values closest to those measured in this work in comparison to Kozlov et al [31] and Kaptay [30] models. Moreover, a smooth inflection point on g À C Li curve is noticed and its location correlates with the chemical compounds existing in the melt, i.e., LiZn 2 .…”

“…18-Viscosity comparison for the liquid Al-Li alloys; measured, literature, and modeled results at 973 K (700°C): diamonds-this work, triangle-Kononenko et al, [51] solid line-ideal, dashed line-model Kucharski, [29] dash-dotted line-Kaptay. [30] Fig. 19-Viscosity comparison for the liquid Li-Zn alloys; measured and modeled data at 873 K (600°C): diamonds-data of this work, dash line-model Kucharski, [29] dash-dotted line-Kaptay.…”

“…19-Viscosity comparison for the liquid Li-Zn alloys; measured and modeled data at 873 K (600°C): diamonds-data of this work, dash line-model Kucharski, [29] dash-dotted line-Kaptay. [30] 3. Microscopic functions: the concentration-concentration function and short-range order parameter…”

“…Various expressions for viscosity (g) calculation are reported in the literature: Moelwyn-Hughes [47] , Kucharski [29] , Kaptay [30] , Kozlov [31] , Gasior [48] etc. In this work, the expressions of Kucharski (K), Kozlov-Romanov-Petrov (KRP), and Kaptay (Kap) models were applied to calculate the viscosity of liquid binary alloys.…”

“…[24] Thus, the aim of this work was to (a) measure the three physicochemical properties: density, surface tension, and viscosity of liquid Al-Li and Li-Zn alloys using Draining Crucible method [25][26][27] over a broad temperature range (from 773 K (500°C) to 973 K (700°C)) (b) calculate them by applying CFM formalism [15,16] (c) explain and understand the influence of short-range ordering on measured properties. Surface tension modeling was also performed using the Butler model [28] but viscosity by applying common known empirical models e.g., Kucharski, [29] Kaptay, [30] Kozlov et al [31] As final result we plan to obtain a complete database of physicochemical properties for liquid Al-Li and LiZn alloys.…”