Need in the development of new materials with excellent properties are growing day by day. Composite materials are the simple and better way to accomplish materials with superior properties. Aluminium metal matrix composites due to their high strength to weight ratio, low cost, improved electrical conductivity and good tribological properties are broadly produced and used in various engineering applications in the area of automobile, aerospace and military engineering. In the present paper an attempt has been made to fabricate MMC of an alloy of aluminium 6064, reinforced with alumina particles through stir casting with vortex technique. Three aluminium alloy composites with alumina (2.5-5-7.5 wt. %) were fabricated. Different mechanical tests for hardness, tensile strength and toughness were carried out for the samples. Addition of alumina to aluminium alloy shows an increase in mechanical properties of aluminium metal matrix composite. The results showed that the stir casting could produce uniformly distributed reinforced particles of Al2O3 in Al 6064 alloy.
This study aimed to investigate the effect of Chromium coating on the tribological performance of the tribopair. The tribological investigation was carried out for different temperature, load and frequency and coefficient of friction and specific wear rate was calculated. The experiments were performed at 3 different levels of loads (10, 20, 30 N), frequency (24, 30, 36 Strokes/sec) and Temperature (40, 80, 120 °C) using a linear reciprocating tribometer. The L9 orthogonal array as per the Taguchi technique was used to analyze the effect of various input parameters and specific wear rate (SWR) and coefficient of friction (COF) were taken as output parameters. The coated surface showed better tribological behavior as compared to cast iron. The temperature had maximum influence on the tribological behavior followed by load and frequency.
In the present paper, an aluminium metal composite with fly ash and graphite as the reinforcement were prepared using the stir casting route. The effects of reinforcements on the hardness of the Al 6061 were evaluated using a Brinell hardness tester and optical micrographs and XRD analysis was done to inspect the distribution of the reinforcements in the Al 6061 matrix. It was observed that the introduction of reinforcements in the Al matrix greatly influenced the surface hardness. There was about 32 % improvement in the hardness value. Optical micrographs also indicated the homogeneous distribution of reinforcements in the aluminium matrix.
The present research has been done to investigate the influence of the relative motion of a plane surface with the other having micro-circular dimples throughout the contact. Using pin-on-disk setup, experiments have been carried out to study the influence of micro-dimple area density on friction and specific wear rate at the interface of two materials. Circular dimples are distributed in spiral array on the disk face. Based on the experiments, better tribological results have been achieved in the starved boundary lubrication mode.
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