Abstract
The aim of this research paper is to find the wear behaviour of Al7075 MMCs. In this investigation, the wear tests on the as-cast and age-hardened specimens were performed on an advanced rotary tribometer. The materials selected for the analysis are Al7075 as a matrix, and the reinforcements are boron carbide. By using stir casting, metal matrix composites are manufactured by adding B4C as a reinforcement particulate in Al7075. The fabricated composites were characterized and the wear behaviour of these composites was carried out on an advanced rotary tribometer. The wt. % of the reinforcements was taken as 6%, 8%, 10%, and 12%. The almost homogeneous blending of reinforcements is shown by the microstructural characterization of Al7075 MMCs. It is observed that due to the rise in weight percentage of the reinforcement to 12% higher hardness is obtained. For 12% of reinforcements, there is an increase in hardness due to the heat treatment than that of the as-cast composites. From this study, it was found that the wear rate is the function of the applied load, microstructure, and volume fraction of the reinforcements. The wear rate was increasing with the sliding velocity.
Highlights
In recent years, a lot of research has been carried out for the aluminium matrix composite reinforced with ceramic particulates
A review on the tribological characterization of particulate reinforced with aluminium metal matrix composites has been published by Shinde et al [1]. ey reported that there is an increasing trend of using aluminium-based composites in sectors such as ground transportation, aerospace, and sports. ey reported the reasons for using aluminium-based composites as high strength-to-weight ratio, wear resistance, corrosion, and fatigue
E powder processing technique is consisting of various methods such as reactive consolidation, injection molding, mechanical alloying, XD processing, high energy rate forming, and microstructurally toughened composites. e melt processing technique includes pressure casting and directional solidification of eutectics. e vapour phase processing for composites includes the arc spray method, chemical vapour deposition, filament coating, and lowpressure plasma spray
Summary
A lot of research has been carried out for the aluminium matrix composite reinforced with ceramic particulates. Al6061/WC/SiC hybrid composites have been synthesized using the stir casting technique under the various weight percentages of reinforcement [5] Various properties such as wear resistance, hardness, tensile strength, and compressive strength were characterized and investigated in this research paper. Rajesh et al [8, 9] have analyzed the effect of reinforcing Al2O3 and SiC on the wear behaviour of hybrid aluminium MMCs on a pin-on-disc tribometer. Al2O3, B4C, and SiC reinforced aluminium matrix composites were fabricated through stir casting and characterized for microstructure and interfacial reaction [10]. Sharma et al [12] examined the wear behaviour of hybrid aluminium alloy composites reinforced with SiC and RE (Rare Earth) mixture CeO2 and La2O3 through stir casting. E aim of this investigation is to synthesize and characterize the Al7075-B4C composites followed by a sliding wear test. is investigation aims to synthesize MMCs with Al-7075 as matrix and boron carbide (B4C) as reinforcement with varying sizes through stir casting. e results were interpreted on the basis of optical microstructure, mechanical properties, and surface morphologies
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