Prediction of HPDC Casting Properties Made of AlSi9Cu3 Alloy

摘要

The paper describes the influence of type of structure and its parameters on mechanical properties of high-pressure die-casting (HPDC) products out of AlSi9Cu3 alloy. The dendritic structure was described using the DAS parameter-a distance between branches of dendrites of a solid α solution (silicon in aluminium), which is a measure of microstructure refinement. According to the Hall-Petch law, the smaller grain causes the better strength. The finest grained structure can be obtained by increasing the rate of heat extraction from a casting to a mould. The best results, considering the classical methods, can be achieved using the high-pressure die-casting method. Therefore, results of studies of mechanical properties of sample castings, made using the above-mentioned casting method, are presented. The sample castings (cast-on samples) were subjected to tensile tests to determine mechanical properties (tensile strength, yield strength and elongation), as well as microstructure studies, considering the DAS. Experimental-simulation validation was performed using the Procast code with the application of a micro-model in the scope of compatibility of the DAS value and yield strength.