Effect of friction stir processing and hybrid reinforcement on wear behaviour of AA6082 alloy composite
T. Satish Kumar, S. Shalini, K. Krishna Kumar
Abstract
Abstract In the present study, microstructure, mechanical properties and wear behaviour of AA6082 alloy reinforced with Yttrium oxide (Y 2 O 3 ) and graphite (Gr) surface hybrid composites produced via friction stir processing have been investigated. Vol.% of Y 2 O 3 particles was varied (2, 4 and 6 vol.%) while the graphite content was kept at as 4 vol.%. Microstructure of synthesized composites revealed uniform distribution of Y 2 O 3 + Gr particles accompanied by a significant reduction in grain size. Microhardness of the composites was found to be 40% higher than the matrix alloy and tensile strength of the composites increased with increase in vol.% of Y 2 O 3 with a marginal decrease in ductility. Wear test results along with SEM micrographs of worn out surface of composites and matrix alloy were compared and correlated with their hardness. Hybrid composites showed better wear resistance.