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Effect of Nano-ZrO 2 Additions on Fabrication of ZrO 2 /ZE41 Surface Composites by Friction Stir Processing

Friction stir processing (FSP) technique was used to fabricate surface metal matrix composites of the newly commercialized ZE41-rare earth magnesium alloy (in cast form) using nano-ZrO 2 reinforcement particles. The volume percentage of reinforcement particles was varied as 4N % (where N 2 [1,2,3,4]) in the matrix. The results of microstructural examinations revealed the reﬁnement of grains from 113 to 0.7 l m. The intermetallic compound (Mg 7 Zn 3 RE) present at the grain boundaries was seen to be distributed as particles after FSP suggesting the formation of ﬁne grains. The presence of reinforcement particles and evolution of ﬁne grains at the stir zone leads to increase in mechanical properties of fabricated composites. The microhardness was seen increased from 70 HV (ZE41) to 119 HV (ZE41-16 % ZrO 2 MMC). The tensile strength was observed to be increased from 154.5 MPa (ZE41) to 195.5 MPa (ZE41-12 % ZrO 2 MMC). From the present study, it was learnt that the addition of nano-ZrO 2 particles coupled with optimized FSP parameters led to the formation of defect-free nanocomposites with increased mechanical properties.