Abstract
Friction Stir Processing (FSP) has been attracting attention as a useful surface modification process for cast alloys. It is well known that casting defects and abnormal structures are easily formed in the base metal. These defects significantly degrade the mechanical properties of the base metal. In this study, surface modification of the ADC12 die casting alloy by multi-pass friction stir processing (MP-FSP) was proposed and successful modification of the base material was achieved. The tensile and fatigue properties were investigated for MP-FSP samples in comparison with the base metal of the ADC12 alloy comprising 4mm thick plates. In all the MP-FSP samples, the tensile strength and elongation were much higher than those of the base metal, and the fatigue life was also superior to the base metal.
