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Cylinder liner and piston ring materials play an important role in the tribological performance of engines. It is possible to reduce friction and wear of cylinder liner and piston ring by using wear resistant material. Compacted graphite iron finds increasing application as a liner material because of its high strength and good wear resistance. In this work, wear performance of two different grades of compacted graphite iron has been compared with that of gray cast iron liner material. Wear characteristics were evaluated using cylindrical specimens in a pin on disc sliding apparatus. High strength compacted graphite iron grade is found to have the best wear resistance among the three materials evaluated in this study. Increased volume fraction of pearlite enhances the wear resistance of high strength compacted graphite iron grade.

Aluminium metal matrix composites (MMC) are one of the most promising engineering materials being increasingly used in automobile industries for critical applications due to their enhanced mechanical and physical properties. In this present study, A356 aluminum alloy reinforced with SiC particle was made by stir casting process. The effects of different volume fractions of SiC particle reinforcement on microstructure and mechanical properties have been investigated. The yield and fracture strength increases with increase in volume fraction of SiC particulates, while ductility decreases. As compared to base alloy, 20% volume fraction of SiC reinforced composites showed 16% increase in tensile strength. Dislocation density, precipitation hardening and changes in grain size are the main mechanisms enhancing the mechanical properties of particulate reinforced composites.