Abstract
This paper involves the fabrication of hybrid Aluminium matrix composite samples of different compositions using Stir casting technique and testing the prepared hybrid composite test specimens for analysing their wear and mechanical properties. LM25 Al alloy was used as matrix material reinforced with constant 9 wt.% of Al<sub>2</sub>O<sub>3</sub> with particle size of 6-23 μm and different wt. percentages of Graphite (particle size of 24-94 μm) as 3%, 4% and 5% to prepare hybrid composite samples of three different compositions. Mechanical properties, for examples, tensile strength, hardness, compression strength and impact strength were analysed for both base LM25 Al. alloy and composite samples. Wear loss and coefficient of friction of composite samples also were studied using Pin-on-disc apparatus. Microstructure images of the hybrid composite samples were examined to study dispersion of dual reinforcement particles in the matrix material, porosity and shrinkage cavities developed during the casting of the composite samples using Optical Microscope. Results revealed that Tensile strength, Hardness and Wear properties of the hybrid composite sample, having 9 wt.% of Al<sub>2</sub>O<sub>3</sub> and 4 wt.% of Graphite particles, were found to be superior to those of re-cast LM25 Al. alloy. This study is mainly focussed on achieving the improved wear resistance and mechanical properties of the hybrid aluminium matrix composite materials for meeting the desired properties of the products by exploring newer compositions of the dual particles reinforced hybrid composites.
Highlights
Metal Matrix Composite (MMC) is composed of a metal matrix and one or more reinforcement materials
In particular, particulate reinforced Aluminium Metal Matrix Composites are preferred over conventional materials by several high tech- manufacturing industries such as aerospace, defence, automotive, defence, aerospace, sports and recreation owing to their outstanding combination of properties, for example, high strength to weight ratio, good thermal properties, good corrosion resistance, cast-ability etc
The results revealed that the wear loss reduced with increase in graphite content and it was found to be minimum at 4 wt.% of graphite, which exhibits the superior wear properties than those of cast base LM25 Al. alloy and other composites [32]
Summary
Metal Matrix Composite (MMC) is composed of a metal matrix and one or more reinforcement materials. In particular, particulate reinforced Aluminium Metal Matrix Composites are preferred over conventional materials by several high tech- manufacturing industries such as aerospace, defence, automotive, defence, aerospace, sports and recreation owing to their outstanding combination of properties, for example, high strength to weight ratio, good thermal properties, good corrosion resistance, cast-ability etc. These are economically available and it is cheaper in fabricating them
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