Influence of Melt Treatments on Dry Sliding Wear Behavior of Hypereutectic Al-15Si-4Cu Cast Alloys

The purpose of the present work is to investigate the microstructure and dry sliding wear behavior of hypereutectic Al-15Si-4Cu cast alloys with grain refinement, modification and/or refinement. Pin-On-Disc wear tests were conducted under dry sliding conditions on the hypereutectic Al-15Si-4Cu cast alloy after various melt treatments for varying loads ranging from 20N to 100N with constant sliding speed of 1 m/s and for a constant sliding distance of 1000m. Tests were also conducted on the hypereutectic Al-15Si-4Cu cast alloy for sliding distance of 2000m with constant sliding speed of 1 m/s and at a normal load of 60N. Results indicate that the addition of grain refiner (Al-1Ti-3B), modifier (Sr) and refiner (P) to the hypereutectic Al-15Si-4Cu unmodified cast alloy converts large á-Al grains in to fine equiaxed α-Al grains and forms fine fibrous silicon particles and fine CuAl2 particles in the interdendritic region. This improves the wear properties of the cast alloy