EFFECT OF TI ADDITION ON THE TRIBOLOGICAL WEAR BEHAVIOR OF HYPEREUTECTIC AL - SI ALLOYS AT ELEVATED TEMPERATURES

Effect of titanium addition on the dry sliding wear behaviour of hypereutectic Al - Si alloys are investigated at elevated temperatures. Wear tests are conducted for varying normal pressure from 0.20 N/mm 2 to 0.98 N/mm 2 , for varying sliding velocity from 0.94m/s to 3.77 m/s and varying sliding distance from 282.74 m to 1696.46 m. In this present investigation, hyper eutectic a luminium based alloys containing 13% and 20% weight of silicon; with addition of titanium is synthesized using casting method. Wear behaviour is studied by using computerized pin on disc wear testing machine. Worn surfaces were examined and analysed by sca nning electron microscopy (SEM) and energy dispersive X - ray spectroscopy (EDS). The wear results show that the wear rate increases with increase in normal pressure (0.20 N/mm 2 to 0.98 N/mm 2 ) and sliding distance (282.74 m to 1696.46 m), but wear rate decre ases with increase in sliding velocity from (0.94 m/s to 3.77 m/s). The addition of titanium to Al - Si alloys increases the wear resistance at elevated temperatures