Temperature dependence of the viscosity of Al-Sr alloy melts

The temperature dependence of the dynamic viscosity of Al-Sr alloy melts has been investigated using a torsional oscillation viscometer. It has been found that the viscosity of the Al-Sr alloy melts decreases with increasing temperature, as well as the absolute value of the first derivative of viscosity with respect to temperature. Furthermore, an anomalous change occurs at about 1250degreesC, indicating the occurrence of a change in the melt structure. The temperature dependence of the viscosity exhibits an exponential correlation and can be well fitted by an exponential decay equation. The comparison of the model predictions and experimental viscosities has also been made, and the model parameters are renewedly determined in the light of the present experimental results. The pertinent mechanisms are also discussed.