The Effect of Modification of Primary Silicon on the Microstructure, Mechanical and Sliding Wear Behavior of Commercial LM-29 Cast Alloy

摘要

In the present paper the microstructure, mechanical properties and wear behavior of commercial LM-29 [Al-24Si-Cu-Mg] alloy before and after the addition of phosphorus (0.02, 0.03, 0.04, 0.05 and 0.06wt %) were investigated. The microstructures and worn surfaces of the alloys were characterized by optical metallurgical microscope/SEM. The results suggest that, the wear resistance of LM-29 alloy were improved with the addition of phosphorus as compared to as cast alloy. However, the maximum improvement in wear and mechanical properties were observed at 0.06wt%P addition to LM-29 alloy. This is due to the change in microstructure resulting from modification of primary silicon present in LM-29 alloy.