Investigation of Effect of the Rheological Parameters on the Flow Behavior of ADC12 Al Alloy in Rheo-Pressure Die-casting

In this study, the various rheological behaviors such as shear rate, viscosity, and shear stress of semi-solid slurry of ADC12 Al alloy are investigated. As-received ADC12 Al alloy is melted and kept above the liquidus temperature (560 °C and 565 °C) to observe the viscosity, shear rate, and shear stress behavior of semi-solid slurry. There is a drastic decrease in the viscosity with an increase in shear rate and temperature. In this, it is observed that the low viscous semi-solid slurry is better for easily filling the mold cavity. The finer α-Al particles are observed in microstructural features of the oil-quenched semi-solid slurry of ADC12 alloy. A 3D model of the valve housing is used to simulate the mold-filling behavior of the semi-solid slurry of ADC12 Al alloy. The flow behavior of ADC12 Al alloy reveals that the low-speed range of plunger movement is the optimum condition to fill the mold cavity. The uniform temperature distribution in the mold also reduces the casting defects such as voids and porosity.