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Mechanical and metallurgical characterizations of AA2014/eggshells/SiC hybrid green metal matrix composite produced at optimum reinforcement parameters

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Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture

Published online on

Abstract

AA2014/carbonized eggshells/SiC hybrid green metal matrix composites are fabricated by electromagnetic stir casting process at optimum parameters (squeeze pressure of 60 MPa, stirring current of 12 A, stirring time of 180 s and matrix pouring temperature of 700 °C, respectively). In the range of reinforcement parameters, the result shows that the tensile strength of hybrid metal matrix composite increases with the increase in carbonized eggshell and SiC preheat temperature. Whereas the tensile strength of AA2014/carbonized eggshell/SiC hybrid green metal matrix composite decreases with the addition of SiC beyond 2.5 wt%. The tensile strength of AA2014/carbonized eggshell/SiC hybrid green metal matrix composite increases with the increase in the eggshell weight percent until it reaches the center value (7.5 wt%); the tensile strength then starts to decrease with the increase in eggshell weight percent beyond the center limit (7.5 wt%). The optimum values of weight percent of carbonized eggshell, preheat temperature of carbonized eggshell, preheat temperature of SiC and SiC weight percent were found to be 7.5%, 300 °C, 500 °C and 2.5%, respectively, to get the maximum tensile strength (predicted: 259.12 MPa). The results reveal that sample of AA2014/7.5% eggshell/2.5% SiC shows best result among all the selected samples. The microstructure presents that the reinforcements (7.5 wt% carbonized eggshell and 2.5 wt% SiC particles) are uniformly distributed in the matrix AA2014 alloy. Transmission electron microscopy image shows proper wettability between AA2014 alloy and reinforcements (7.5 wt% carbonized eggshell and 2.5 wt% SiC particles). Density, X-ray diffraction, cost estimation, hardness, toughness, ductility and fatigue strength were also calculated to see the effect of carbonized eggshell and SiC addition in matrix alloy AA2014.