MICROSTRUCTURE AND WEAR CHARACTERISTICS OF AL-4.5CU-5PB ALLOY

Al-4.5Cu-5Pb alloy was prepared by sand and chill casting. The same al loy was also spray deposited at a gas pressure of 1.6 MPa. The microst ructural features exhibit a coarse to fine dendritic morphology for sa nd and chill cast alloys. Equiaxed grains were observed for spray form ed alloys. Wear testing employing a pin-on disc type set-up, reveals c onsiderably lower wear of spray deposited alloy compared to that of ch ill and sand cast alloys. The morphological features of wear track on specimen and debris indicated a mixed oxidative-cum-adhesive wear mech anisms for these alloys tested in the present investigation.