Effect of Si content and Melt superheat on the liquid aluminum viscosity

摘要

In the casting processes, fluidity is defined as the maximum length which liquid metal will flow before it is stopped by solidification. The main factor determining the fluidity of liquid metal is the viscosity because which affect in many rheological properties such as surface tension, thermal conductivity and diffusivity. Viscosity is affected mainly on alloy composition and temperature, especially in Al-Si alloy casting alloy, evaluation of viscosity for Si content and pouring temperature is very important because which are affected directly on fluidity. However the researches on the effect of Si content and temperature on viscosity are not sufficient, because methods for measurement of viscosity have limitations such as liquid metal's low viscosity, high temperature and error of measurement. So in this study, the effect of Si contents and melt superheat on the liquid aluminum viscosity is studied.