Accepted Manuscript Not Copyedited 1 Wear resistance of Al-12Si alloys by reinforcing TiC and TiN particles Ali Samer 1 , Malek Ali* 2 , Projjal Basu 3 and Faiz Ahmad 4 Abstract This study presents the mechanical properties of Al–12% Si matrix composite reinforced by various amounts of Titanium Carbide (TiC) and Titanium Nitride (TiN) particles, the wear behaviour was investigated using a pin-on-disc wear testing machine with varying parameters such as normal load, reinforcement’s percentage and track velocity, the results show that the wear of Al-12Si matrix reinforced by 5%, 10%, 15% of TiC particles at 150 rpm with 15 N loads were: 73 mm 3 x 10 -3 , 61 mm 3 x 10 -3 , 50.5 mm 3 x 10 -3 respectively which are less than the wear for same composites at 225 rpm with 15 N. This is due to the length of rubbing is more in case of higher speed. The results also show that the wear of the samples were decreased with increasing the percentage of reinforcement of TiN at both sliding speed (150 rpm, and 225 rpm). The hardness of Al-12Si/TiC composites with 5% of TiC were found 50 and the hardness of same composites with 15% of TiC reinforcements were 67which are less than the hardness of Al-12Si/TiN composites with 15% TiN reinforcements. The microstructural study of the composites before wear test showed uniform distribution of (TiC and TiN) particles through the cross-section of the specimens and finer surfaces than matrix composite after wear test. The mechanical properties such as hardness and wear resistance are observed to be increased considerably compared to the matrix composite. Keywords: Al-12Si composites; Hardness; Wear; TiC; TiN. 1 Doctoral Student, Dept. of Mechanical Engineering, Univ. Technologi Petronas, Malaysia, E-mail: albatreeq2001@yahoo.com. 2 Assistant Professor, Dept. of Mechanical Engineering, Univ. of Tabuk, Saudi Arabia, corresponding author (Malek Ali) E-mail: malikali77@yahoo.com. 3 R&D Chief, QATD Dept., Southern Steel Bhd, Prai Industrial Estate, Penang, Malaysia.E-mail: projjal.basu@southsteel.com. 4 Associate Professor Dept. of Mechanical Engineering, Univ. Technologi Petronas, Malaysia, E-mail: faizahmad@petronas.com.my. Journal of Engineering Mechanics. Submitted May 7, 2012; accepted October 29, 2013; posted ahead of print October 31, 2013. doi:10.1061/(ASCE)EM.1943-7889.0000743 Copyright 2013 by the American Society of Civil Engineers J. Eng. Mech. Downloaded from ascelibrary.org by UNIVERSITI TEKNOLOGI PETRONAS on 11/07/13. Copyright ASCE. For personal use only; all rights reserved.