Comparative Investigations on Al7075 MMC reinforced with wt. %6 Al2O3 and B4C

MMCs are finding greater applications in aerospace, auto industries owing to their typical properties with respect to wear, mechanical and temperature resistance. The present study involves evaluation of microstructure, drilling, mechanical properties for Al7075 reinforced with Al₂O₃ content of wt.% 6.MMC and compare with Al7075 - 6% B4C composite for showing effect of reinforcement on drilling, mechanical properties. The composite samples were examined for mechanical, bending strength, hardness, elongation behaviour. Results revealed that uniform circulation of particulates in matrix structure with great bonding. Al7075 reinforced with 6% B4Cdisplays high mechanical strength, better elongation, high surface quality and low hardness is seen. Surface roughness test was carried on the basis of Taguchi's L9 orthogonal, and analysed by ANOVA, results specify maximum influence on surface roughness is due to speed for Al2O3. Further with B4C the surface roughness is affected by material, confirmation tests were also conducted for validation of process parameters. (paper)