Microstructural evolution, segregation and fracture behavior of A390 alloy prepared by combined Rheo-HPDC processing and Sr-modifier

The microstructural evolution, segregation behavior and fracture mechanism of the hypereutectic A390 alloy prepared by Rheo-HPDC processing with Sr-modifier were investigated by morphology analysis and electron probe microanalysis technique (EPMA). The results indicate that the Rheo-HPDC processing with Sr-modifier can simultaneously refine the primary Si particles (PSPs) and modify the eutectic Si. Strontium reduces the formation tendency of...