Paper Title
Improvement of Mechanical Properties of Cast ZA-27 Treated with addition of Nano-Zinc Oxide

Abstract
An investigation has been carried out on making and characterization of ZA-27 alloy treated with zinc oxide nanoparticles. This was aimed at developing high performance ZA-27 alloy with low density. The particle size and morphology of the zinc oxide (ZnO) nanoparticles were investigated by Transmission Electron Microscope (TEM) and the elemental composition was obtained from Energy Dispersive Spectroscopy (EDS) attached to TEM and X-ray fluorescence spectroscopy (XRF). ZA-27 nano alloy samples were developed using 0, 1, 2, 3, 4 and 5 wt% of ZnO nanoparticles by induction furnace casting technique. Mechanical properties and Microstructural examination were used to characterize the composite samples produced. The results show that hardness and ultimate tensile strength of the composite samples increased progressively with increase in weight percentage of ZnO nanoparticles. Increase in Ultimate tensile strength (UTS) of 10.2%, 21.1%, 22.3%, 35.5%,33.4% and increase in hardness value of 8.2%, 14.8%, 21.7%, 27.9%, 27.1% were observed for Zn -27 alloy treated with 1 wt%, 2 wt%, 3 wt%, 4 wt%, and 5 wt% ZnO nanoparticles respectively in comparison with untreated alloy. It was generally observed that alloy containing 4 wt% of treated has the highest tensile strength and hardness values. However, the fracture toughness and percent elongation of the composites samples slightly decreased with increase in ZnO nanoparticles content. Results obtained from the Microstructural examination using optical microscope and Scanning Electron Microscope (SEM) show that the nanoparticles were well dispersed in the ZA-27 alloy . Keywords - ZA-27alloy,Synthesis,Characterization,ZnO-nanoparticles,Mechanical Properties, Microstructural Examination