In this study, to produce a thin product for a nocturnal fluoroscope cover from a Mg alloy by semi-solid processing, the die filling behavior of a semi-solid slurry was simulated with an ANYCAST program which was compared with the real product. The rheological behavior of the semi-solid slurry of the Mg alloy was considered in a computational fluid dynamic study using the reported data between the viscosity and shear rate of a semi-solid slurry of the Mg alloy. Also, in order to analyze precisely the rheological behavior, the ANYCAST program based on the Carreau model was used to simulate the flow behavior during the filling by the semi-solid slurry into a die mold in a high pressure diecasting machine. Further the time-dependent heat transfer coefficient between the die mold and casting was considered in the simulation study. The predicted defects from the simulated study with the ANYCAST program matched well with those in the actual product.

Keywords: semi-solid processing; rheology; Carreau model; viscosity; Mg alloy; die filling behavior