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Abstract
This study aimed at fabricating Al 7075-based metal matrix composites (MMCs) reinforced with 3 wt.% Titanium Carbide (TiC) and varying proportions of graphite (1 wt.%, 3 wt.%, and 5 wt.%) using the stir casting technique. The synthesized composites were systematically characterized through mechanical testing, including tensile and hardness evaluations, as well as detailed microstructural analysis using Scanning Electron Microscopy (SEM). The TiC particles were found to be uniformly dispersed within the ductile Al 7075 aluminium matrix, exhibiting strong interfacial bonding between the reinforcement and matrix. This homogeneous distribution, coupled with effective particle-matrix interaction, led to notable improvements in mechanical and surface properties over the unreinforced Al 7075 alloy. Among the tested specimens, the composite with an optimal reinforcement combination achieved superior tensile performance, recording an ultimate tensile strength (UTS) of 113.7 MPa, yield strength of 100.1 MPa, elongation of 2.4%, and a Rockwell hardness of 223 HRC.
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