Experimental investigation of LM25 alloy reinforced with SiC, Gr and MOA particles

Abstract

An experimental investigation was performed on an LM25 aluminium alloy reinforced with silicon carbide (SiC), graphite (Gr) and moringa oleifera ash (MOA) particles. The composites with different proportions such as 5 w/% of SiC, 5 w/% of SiC + 1 w/% of Gr, 5 w/% of SiC + 3 w/% of Gr, 5 w/% SiC + 1 w/% MOA, and 5 w/% of SiC + 3 w/% of MOA were produced with the stir-casting method. The effects of the reinforcement particles on density, micro-hardness, grain size, porosity, particle distribution and microstructure were studied. A characterization study was made using optical microscopy (OP) and scanning electron microscopy (SEM). Based on the hardness and density results, the MOA-reinforced composites had better hardness and decreased porosity when compared to the Gr-reinforced composites. The MOA particles exhibited a homogeneous distribution in the matrix whereas the Gr particles had a few cluster formations.

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