Transactions on Machine Design G. Balakumar, Joel Hemanth 4 2 2016 This paper aims at development of aluminum alloy (LM 13) reinforced with varying wt.% (3 to 15wt.% in steps of 3) of nano-ZrO2 particles(mesh size 70-90nm) cast using chilling technique which remains an attractive choice among all the solidification processing routes due to its capability of bringing together the advantages of both stir casting and directional solidification. The developed NMMCs and the as cast matrix alloy were hot extruded in a hydraulic press at 250oC. Investigations of microstructural characterization reveal uniform distribution of reinforcement with interfacial integrity between matrix and the reinforcement. Dry sliding wear behavior of the developed NMMCs and matrix alloy was investigated using pin-on-disc apparatus under varying loads. The results exhibit a limiting load known as transitional load beyond which the material (whether matrix alloy or NMMCs) experiences ‘seizure’. The transitional load of the developed NMMCs was much higher than matrix alloy. It was also observed that the specific wear rate significantly decreased with increase in reinforcement content but remarkably increases with increase in applied load and sliding distance. However the coefficient of friction registered decreasing trend with increase in sliding distance and reinforcement additions. SEM photograph of worn surfaces of developed NMMCs and matrix alloy reveal delamination of MML (mechanically mixed layer) attributing for seizure.