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The IUP Journal of Mechanical Engineering
A Comparison of TiCN + Al2O3 + TiN and TiAlN Coated Carbide Tools for Machining of Inconel 718
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The paper focuses on the development of AA6061 single reinforced composites with 5 wt.% of graphite, 5 wt.% of boron carbide and a hybrid composite reinforced with 5 wt.% graphite + 5 wt.% boron carbide + 5 wt.% cerium oxide. The microstructures of manufactured single reinforced composite and hybrid composite were studied using optical microscope. The mechanical properties like hardness and tensile strength were also studied. The Vickers microhardness of graphite reinforced composites decreased from 45 VHN to 36 VHN and of boron carbide reinforced composites increased from 45 VHN to 74 VHN, while that of hybrid composites increased from 45 VHN to 68 VHN. The Brinell macrohardness of graphite reinforced composites decreased from 30 BHN to 25 BHN and of boron carbide reinforced composites increased from 30 BHN to 50 BHN, while that of hybrid composites increased from 30 BHN to 44 BHN. The ultimate tensile strength of graphite reinforced composites decreased from 160 MPa to 138 MPa and of boron carbide reinforced composites increased from 160 MPa to 195 MPa, while that of hybrid composite increased from 160 MPa to 175 MPa.

 
 

Aluminum is found to be plenty in earth’s crust and it is the third element found in good amounts after oxygen and silicon. Its weight is about 8% of the earth’s solid surface. Due to easy availability, easy machinability, durability and malleability, aluminum was the most widely used metal in 2005, having usage of 31.9 million tons (Bajaj, 2010). Given all these advantages, the use of aluminium alloy can be extended further if it is alloyed with a hard phase to improve its mechanical properties like hardness and tensile strength. When aluminum is reinforced with such a hard phase (reinforcement), the material formed is known as Aluminum Matrix Composites (AMCs). The AMCs, in which reinforcing phase is in the form of particles such as Al2O3, B4C, graphite, SiC and CeO2, are known as particulate AMCs. These particulate AMCs have improved mechanical properties with lower weight than that of conventional Al alloy (Sharma et al., 2014). Due to technology growth, there is enlarged demand for an economical, low weight, harder, stronger and energy-saving material in the aerospace and automotive applications. Particulate AMCs have found application in these areas (Wang et al., 1995; and Garcia et al., 1996). In the past few years, most of the researchers tried to reinforce monolithic metals like aluminum with ceramic phase to enhance their properties (Cylne, 2000), and these particulate AMCs formed have very strong potential in the areas of engineering and non-engineering components (Jokinen and Rauta, 1992). Particulate AMCs, when compared to unreinforced alloy, have better properties such as high strength, high stiffness, high wear resistance and high thermal stability. Furthermore these properties can be adapted to a specific requirement (Cylne, 2001).

 
 

Aluminum (Al), Aluminum Matrix Composites (AMCs), Boron Carbide (B4C), Cerium Oxide (CeO2), Hybrid Aluminum Matrix Composites (HAMCs)