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The naturally occurring bio hazardous material Egg Shell is added to the aluminum 6061 grade alloy powder and its effects on the micro structures and the properties of the composite Al 6061 with egg shell were studied. The samples of 5, 10, and 15 % by weight of the egg shell in the Al 6061 alloy powder were prepared and studied in by an optical microscope. The properties both physical and mechanical including density and Vicker's micro hardness are estimated. The results showed an improvement of hardness of about 14% with the improvement in the percentage of reinforcement. The SEM images of the specimens showed a good bonding between the egg shell and the Al 6061 alloy powder. The density of the composite reduced significantly with an increase in the composition of the egg shell in the composite.

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Aluminum and its alloys are finding increasing applications in every sphere of industry with various reinforcements. New reinforcements like graphene and carbon nanotubes (CNTs) are in focus on account of its contribution in mechanical, thermal, and electrical properties. Achieving uniform distribution and selecting the right manufacturing process still remain a challenge. Hence, this review takes into account the contributions by many researchers and attempts to consolidate the findings that may close the gap and identify the scope for future research. In spite of the advantages of aluminum, it requires improvement in strength, wear resistance, heat resistance, conductivity, and thermal expansion. Among the available reinforcements, CNT stands out because of its unique features of thermal conductivity, expansion, and strength. The effect of multiwalled CNT reinforcement in metal on precipitation hardening is also discussed.