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Microstructural and Hardness Study of A390/20wt.% SiC Functionally Graded Metal Matrix Composite

Amal Vijay, Prem Kumar J., S. Anoop Kumar

Abstract


Functionally graded materials are the upcoming new class of advanced materials, which exhibit gradual change in the microstructure and the composition in a definite direction, and hence variation in functional performance within a part. Functionally graded metal matrix composites (FGMMC) are FGM with metal and ceramic constituents. Aluminum-Silicon alloys are well-known for their unique combination of desirable characteristics, which includes excellent castability and less density combined with good mechanical properties. One such alloy that has been developed specifically for its wear resistance is the hypereutectic aluminum-silicon alloy A390. The research of wear behavior of this alloy at high temperatures has attracted attention in the past years. However, prospects of hypereutectic A390 alloy reinforced with SiC in a functionally graded manner are not discussed much in literature. The present study focuses on the development of A390/20wt.% SiC Functionally Graded Composite for high temperature tribological applications. The functionally graded A390/20% SiC is fabricated using centrifugal casting. The strengthening phases observed in the microstructural study are constituted by SiCp in the composite, which is formed in a graded manner confirming the FGMMC development. The hardness value showed a decreasing trend from outer to the inner region as expected from a functionally graded material. The hardness at the outer periphery of the developed FGMMC is also found to be higher than that of A390 alloy indicating higher wear resistance of the material.

Keywords


A390/SiC, centrifugal casting, metal matrix composite, microstructure, hardness, SiC particles

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References


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DOI: https://doi.org/10.37628/ijmmp.v6i2.1178

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