The Influence of the Addition of MoS2 Particles on Stir Cast Al-7175/Si3N4-Based Hybrid Composites Mechanical and Physical Properties

In this paper, the mechanical and physical behavior study of hybrid aluminum metal matrix composites has been carried out. Aluminum 7175/Si3N4-based hybrid composites have been developed by infusing MoS2 and Si3N4 particles via vacuum-assisted bottom pouring stir casting technique. Mechanical and physical behavioral synthesis was carried out by varying weight percentages of Si3N4 (0-9%) and MoS2 (3, 5 and 7) particles as reinforcement. Apart from mechanical and physical behavioral evaluations, the microstructural features were investigated. The microstructural analysis showed a grain refinement with the addition of reinforcing content. The hybrid composites results exhibited micro-hardness, tensile strength and compressive strength with 7 wt% of Si3N4 and 5 wt% MoS2. The density of HAMMCs was also improved by 2.77% as compared to monolithic base alloy. During the micro-hardness evaluation of cast samples, influence of variation in indentation load and dwell time was examined.