IDL - International Digital Library Of Technology & Research Volume 1, Issue 3, Mar 2017
Available at: www.dbpublications.org
International e-Journal For Technology And Research-2017
Studies On Microstructure And Mechanical Properties Of Flyash Reinforced Al2024 Composites Sathisha N 1, Tejas G2, Praveen kumar R A 3, Manjunath Vajjaramatti4, Avinash L5 UG student, Department of Mechanical Engineering, NMIT Bengaluru, Karnataka, India1, 2, 3, 4 Assistant professor, Department of Mechanical Engineering, NMIT, Bengaluru, Karnataka, India 5
Abstract: The aim is to study the mechanical property and Tribological behavior of Al2024/flyash composite with various weight fractions (3%, 6%, 9%) were prepared by squeeze casting method. The average particle size of flyash is 45-50 Îźm. In addition, Al2024 alloys were cast for comparison purposes. Microstructure, hardness and tensile properties of these composites were evaluated and compared with as-cast alloy and the composites. In addition, tribological properties of these composites were evaluated using a Pin-on-Disc apparatus with different parameters of varying loads of 10N and 50N and(with constant parameters such as time of 10 minutes, sliding velocity of 3 m/s, track diameter of 150mm).The microstructure of the composites shows homogenous distribution of flyash particles in the Al matrix composite. The wear and mechanical properties of composites improve with increasing the weight fraction of flyash. The aim of present study is to evaluate the effect of microstructure, mechanical and tribological properties of aluminium alloy Al2024/flyash metal matrix composites Keywords: Al2024 alloy, Flyash, microstructure, Hardness, Wear.
1. INTRODUCTION Conventional monolithic materials have limitations in achieving good combination of strength, stiffness, toughness and density. To overcome these shortcomings and to meet the ever increasing demand of modern day technology, composites are most promising materials of recent interest. Metal matrix IDL - International Digital Library
composites (MMCs) possess significantly improved properties including high specific strength; specific modulus, damping capacity and good wear resistance compared to unreinforced alloys. There has been an increasing interest in composites containing low density and low cost reinforcements. Among various discontinuous dispersoids used, fly ash is one of the most inexpensive and low density reinforcement available in large quantities as solid waste by-product during combustion of coal in thermal power plants. Hence, composites with fly ash as reinforcement are likely to overcome the cost barrier for wide spread applications in automotive and small engine applications. It is therefore expected that the incorporation of fly ash particles in aluminium alloy will promote yet another use of this low-cost waste byproduct and, at the same time, has the potential for conserving energy intensive aluminium and thereby, reducing the cost of aluminium products [1-3]. Now a days the particulate reinforced aluminium matrix composite are gaining importance because of their low cost with advantages like isotropic properties and the possibility of secondary processing facilitating fabrication of secondary components. Cast aluminium matrix particle reinforced composites have higher specific strength, specific modulus and good wear resistance as compared to unreinforced alloys [46].While investigating the opportunity of using fly-ash as reinforcing element in the aluminium melt, R.Q.Guo and P.K.Rohatagi [7-8] observed that the high electrical resistivity, low thermal conductivity and low density of fly-ash may be helpful for making a light weight insulating composites. The particulate 1|P a g e
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