Abstract
The wear Behaviour of LM 25 reinforced with nano Al2O3, a nanocomposite with increased wear resistance is investigated. Strength and Stiffness is manufactured by Stir casting. Four different specimens of reinforced nanocomposite have been manufactured with the addition of nano alumina consisting of 99%LM 25+1% Nano Al2O3, 98.5%LM 25+1.5% Nano Al2O3, 98%LM 25+2% Nano Al2O3, 97.5%LM 25+2.5% Nano Al2O3 along with pure LM 25 aluminium alloy. Dry sliding wear tests were performed using PIN-ON-DISC tribometer apparatus and the wear performances were investigated under both loading and unloading conditions. Reinforcement of nano-sized particles with aluminium matrix yields superior mechanical and physical properties and changes morphology of nano-composites. The wear reduction is due to strong bond formation between Al and Al-Al2O3 nano composites. The results show that the addition of nanopowder in varying proportions influences the increased wear performance of the aluminium alloy and the maximum wear reduction is obtained with the addition of 2.5% Nano Al2O3, when compared with the results of pure LM25and other al-Al2O3 composites. The wear test is performed by sliding the fabricated Nanocomposite cylindrical pins against the steel disc at a constant sliding velocity in gravity loading and loading condition (i.e)500g load.
Highlights
Pure Al is among the most interesting model materials for processing because of its unique micro structural and mechanical features (1) the wear resistance of pure Aluminium processed by various processing parameters(2) is studied
The wear test is performed by a pin-on-Disk tribometer wear-testing apparatus
The al-reinforced composites shows the best performance with the improvement in the wear resistance with the addition of nano particles upto a certain limit
Summary
Pure Al is among the most interesting model materials for processing because of its unique micro structural and mechanical features (1) the wear resistance of pure Aluminium processed by various processing parameters(2) is studied. The main cause for its use in composite manufacturing is low density of aluminium (3) and the reason for its usage in the industries is because of its increased properties in composites such as low density, high strength and stiffness, high specific modulus, very good wear resistance, low coefficient of thermal expansion, high damping capacity and excellent high temperature properties. These properties have led to numerous applications of these composites in different industries such as automobile applications, aerospace and aeronautical, military and nuclear power (6) Wear Behaviour of aluminium matrix composites depends on strength of the interface between matrix and reinforcement particle. There is a gradual reduction in the wear rates of all the specimens in the same testing conditions
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