Hardness And Microstructure Of Functionally Graded Aluminium Silicon Alloy With Multiwall Carbon Nanotube Composite By Powder Metallurgy With Hot Extrusion Technique

A multi-wallcarbon nanotube-reinforcedfunctionallygradedAlSi composite producedin 4-layers by powdermetallurgywith a hot extrusion technique by varying MWCNT by wt% (0, 0.25, 0.5, and 0.75). Ball millingisemployed to mix multi-wallcarbon nanotube with Aluminium siliconalloypowder for 6hours by takingsuitableparameters. Cold compaction didstrengthen 4-layer functionallygraded composite material and thenfollowed by hot extrusion. The specimencutlongitudinallyusingwirecutting machine for opticalmicroscopy to study the microstructure to evaluate multi-wallcarbon nanotube distribution over the sample'slengthwithincreasing concentration. SEM morphology of powdered mixture of AlSiwith MWCNT images indicating the distribution of MWCNTs over the AlSi surface. EDX analyses carry out to confirm the constituents of matrix and reinforcement. Hardnessimproved over the length by 78% for AlSi+0.75wt% in the FGM layer concerning the increasing concentration of multi-wallcarbon nanotube in the FGMC specimen.