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Sourabh Kumar Soni,Daksh Ganatra,Parth Mendiratta,CH. S. K. Akhilesh Reddy,Benedict Thomas 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.2
The present work deals with the microstructure and mechanical characterization of the Al6061 based nanocomposites (2wt% Graphene and 2 wt% Al2O3)and hybrid nanocomposites (2 wt% Al2O3with 0.5, 1, 1.5, 2 and 2.5 wt% of Graphene)processed through ultrasonic-assisted melt-stirring technique. The combined effort of reinforcement processing (ball-milling)and ultrasonic-assisted melt stirring approach has been adopted for fabricating hybrid nanocomposites with uniformly dispersedceramic nanoparticles and carbon nanomaterial. The grain structure, physical properties, fractured surfaces, microhardness,hardness, ultimate tensile strength (UTS), flexural and compressive strength of the Al6061, Al6061-based nanocompositesand hybrid nanocomposites were examined to understand the influence of ceramic and nanomaterial particleson the microstructure and mechanical characteristics of the fabricated specimens. Microstructure investigation employingoptical microscopy (OM) images and scanning electron microscopy (SEM) revealed homogenous dispersal of nano-sizedAl2O3and Graphene particles in the prepared hybrid nanocomposite specimens. The mechanical properties of the hybridnanocomposites enhance with the increase of graphene nanoparticles (up to 1 wt%) in the nanocomposite. The mechanicalcharacteristics of the hybrid nanocomposites exhibited a decreasing trend with an increase in Graphene up to 2 wt%, and anincreasing trend is observed with a further increase in Graphene after 2.5 wt%. Al6061-2 wt% Al2O3-1 wt% Graphene hybridnanocomposite depicts enhancement in compressive strength, UTS, flexural strength, hardness and microhardness of about105.55%, 171.70%, 37.86%, 71.11% and 34.78%, respectively as compared to casted Al6061 specimen.