Investigating Properties of Hybrid Alumina/ Graphite Aluminium Matrix nano Composites

Abstract

Huge demand of lightweight materials in aerospace, automotive and recreational goods enthuse the manufacturing sectors to further exploit the interesting characteristics i.e., high specific strength to weight ratio, wear resistance and stiffness1 with high thermal conductivity and lower co-efficient of thermal expansion. With this objective the effect of mixing alumina and/or graphite in aluminium 7075 hybrid nanocomposite was studied, w.r.t stirring time variation on mechanical properties (hardness, toughness and ultimate compressive strength) and validated by Optical Microscopy (OM) and Scanning Electron Microscopy (SEM) to characterized AA7075/Al2O3/Gr hybrid composites. The impact of variation of mechanical stirring time followed by fixed ultrasonic time is investigated deploying Response surface methodology/ design of experiments. From the analysis it was observed that hardness, Ultimate compressive strength and toughness of developed nanocomposite generally improved with mechanical stirring combined with ultrasonic homogenisation, with some softness associated in case of graphite nano composited. Optimization results of weight percentage of alumina, graphite and stirring time are reported. How to cite this article: Singh S, Gupta A, Sharma VS. Investigating Properties of Hybrid Alumina/ Graphite Aluminium Matrix nano Composites. J Adv Res Mfg Mater Sci Met Engr 2019; 6(3&4): 8-20. DOI: https://doi.org/10.24321/2393.8315.201902