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Functionallygraded (FG) Al-SiCP composites fabricated via centrifugal casting are widelyused in automobile components particularly a brake rotor disc be-cause of itshigh SiC fraction at the outer periphery. However, when operated in corrosiveenvironment like road deicing salts the disc is highly sensitive to thecorrosion due to high SiC fraction. But, the nanocrystalline (NC) structuredsurfaces synthesized by severe plastic deformation (SPD) method have excel-lentwear and corrosion resistance at the surface. Therefore, shot peening (SP) as aSPD method conducted on one side of the stir casted FG Al composite having 10wt% SiCP constant reinforcement in order to create NC structured surface. TheSP treatment continued for 70 s and 140 s durations. Thereafter, the surfacecharacteristics of the composite before and after SP were estimated by XRD andthen the composites were tested by wear and corrosion tests. The resultsrevealed that the SP for 140 s duration favors the induction of hardened layer,higher grain refinement (NC structure) and dislocation density which promotesthe occurrence of high surface hardness, thus significantly improving its wearproperties. However, higher dislocation density resulted from longer durationshown deterioration to the corrosion resistance. Whereas, the attained degreeof NC structure is more pronounced over dislocation density resulted after 70 sSP duration, thereby composite showed excellent corrosion re-sistance. Thus,the composite with 70 s duration possessed excellent corrosion and relativelygood wear properties too.

Influence of Nanocrystalline Structure on Wear and Corrosion Behavior of Al-SiC&lt;sub&gt;P&lt;/sub&gt; Composite

Influence of Nanocrystalline Structure on Wear and Corrosion Behavior of Al-SiC<sub>P</sub> Composite