Author : Chaitra H M 1
Date of Publication :12th August 2021
Abstract: In the past decade, the automotive and aerospace industries demand for lighter materials with unique energy characteristics and strength-to-weight ratios has largely offset the development and use of compounds based primarily on aluminium alloys. In the present work Aluminium 7075 (Al 7075) is reinforced by 2 % by weight of magnesium and different proportions of boron carbide particles and is fabricated by stir casting. Aluminium alloy is selected as the base material, the magnesium content remains unchanged, and the boron carbide particles are reinforced with variable ratios of 0%, 0.5%, 1%, 1.5% and 2%. In order to realize the uniform distribution of the reinforcing particles, the mixing and casting process of cylindrical casting is carried out by pouring the material into the metal mould. The samples were machined to determine pin-to-disk wear characteristics by dry sliding. A ground disc made of EN-32 material with a surface roughness of 0.394 μm and a hardness of 62 HRC was used as the rotating component and the composite sample (pin) is fixed. The test is limited to a fixed path length of 2000 meters, sliding velocity of 2.5 m/s and a normal load of 20 N. The microstructure and mechanical properties of the composite specimen are tested and analysed for their tensile, hardness and wear according to ASTM standards. Scanning electron microscopy (SEM) is employed to observe particle distribution and understand surface characteristics.
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