In the current era of aerospace, automobile and other various industries, light weighed aluminium metal matrix composites plays a very major role. Metal matrix composites are composed of base material as metallic which is reinforced with ceramic particulate as reinforcement material. This paper consists of the preparation of micro composites by two step stir casting process by the addition of B4C particulates (80-90µm) into the AA2124 matrix by varying different weight percentages of 3% and 6% at a temperature of 730-750˚C. Further once the composites are prepared are subjected to characterization, the SEM revealed that there is good uniform distribution of micro particles in the aluminum by exhibiting a good bonding with matrix and EDS confirmed the presence of B and C elements. Different properties were evaluated like density, hardness, ultimate tensile strength and yield strength which revealed that there is an increase in the mechanical properties than compared to the base metal.
Investigations on mechanical behavior of Al7075 -nano B4C composites T H Manjunatha, Dr. Yadavalli Basavaraj, Madeva Nagaral et al. Abstract. 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.
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