Thermodynamic description of the viscosity of liquid solder alloys with minor Co impurities

ABSTRACT
Because of the increasing complexity and cost of experiments
carried out, the data for the multi-component alloy systems
have frequently been obtained by numerical modelling. It is
clear that the related calculations require reliable data dealing
with the pure components and binary alloy systems. Selecting
the reliable data concerning the pure components from the
literature, the viscosities for the SAC and (SAC)1−x Cox solder
alloys have been calculated using different viscosity models
(geometric and physical). The viscosity decreases as the
amount of tin content increases in the SAC387 alloy while the
addition of the cobalt to SAC387 solder results in the
increasing of the viscosity. Moreover, by computing the root
mean square values between theoretical and experimental
viscosities, it can be concluded that the lowest value among
all models is that of obtained by Kaptay equation.