Conference Papers

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    Effect of L/D ratio on Al-Si functionally graded material cast through centrifuge technique
    (2011) Kiran Aithal, A.S.; Narendranath; Desai, V.; Mukunda, P.G.
    Functionally Graded Material (FGM) is a class of material wherein the properties and structure are varied intentionally from one side to the other side of the specimen. This paper describes the effect of L/D (Length to Diameter) ratio of the cast on cast Al-Si FGM. The present study uses Al-17%wt Si to cast FGM's. The cast is evaluated for Microstructure and Hardness all along the length of the specimen. Three L/D ratios: 0.5, 1.0, 1.5 were cast using the Centrifuge Technique. The microstructures showed that enrichment of primary Si was largest in 1.5 ratio compared to other two. Hardness value of the cast at the upper and lower region were examined and found that gradient of hardness was more in 1.5 case. High volume percentage of primary Si was nearly 26% in the upper region and a hypoeutectic structure in the lower region. © (2011) Trans Tech Publications.
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    Future applications of carbon nanotube reinforced functionally graded composite materials
    (2012) Udupa, G.; Rao, S.S.; Gangadharan, K.V.
    Future applications demand materials having extraordinary mechanical, thermal and chemical properties which must sustain the different environment conditions and in the same time available easily at reasonable prices. The carbon nanotubes(CNT) reinforced functionally graded composite materials(FGCM) is expected to be the new generation material having a wide range of unexplored potential applications in various technological areas such as aerospace, defence, energy, automobile, medicine, structural and chemical industry. They can be used as gas adsorbents, templates, actuators, catalyst supports, probes, chemical sensors, nanopipes, nano-reactors etc. This paper explores in detail the different possibilities of application of CNT reinforced functionally graded composites and manufacturing techniques, which raise the awareness on the promise of nanotechnology and the potential impact on aerospace industry as well as on other areas. © 2012 Pillay Engineering College.
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    Centrifugal casting and characterisation of primary silicon and Mg2Si dispersed aluminium functionally graded materials
    (Trans Tech Publications Ltd ttp@transtec.ch, 2015) Midhun Krishnan, P.; Sanil, S.; Jayakumar, E.; Rajan, T.P.D.; Prabhu, K.
    Aluminium based FGM rings, reinforced by in-situ primary Si and primary Si/ Mg2Si hybrid reinforcement were successfully fabricated by centrifugal casting and micro structural, chemical, hardness and corrosion characteristics were evaluated. It was observed that in Al-20Si ring the primary Si particles were present mostly in inner region and few in outer region where as in Al-20Si-3Mg ring both the primary silicon and Mg2Si were completely found in the inner region only resulting in a graded FGM structure. The hardness values were measured along radial direction of samples and variations corresponding to micro structural variation were analysed. Optical Emission spectroscopic studies have revealed the remarkable compositional changes along radial direction. Corrosion characteristics were also evaluated both in particle rich and depleted regions. © (2015) Trans Tech Publications, Switzerland.
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    Study of dry sliding wear behavior of Al-Si-C FG alloy developed through directional solidification
    (American Institute of Physics Inc. subs@aip.org, 2019) Narayanappa, R.B.; Ramesh, M.R.; Kiran Aithal, K.A.; Shivakumar, V.K.; Manjunath, M.H.N.
    FGM is the materials in which the composition or micro structure or both are varied locally to attain a specific form of material properties from one position to the other extreme position. In this work Al-18wt% Si-2wt%C FG Alloy is processed through Directional solidification with base excitation. Molten metal when poured into the insulated mold, The copper chill which is placed at the bottom will extract heat so that solidification takes place linearly. When excitation is provided at the bottom the Silicon in the alloy will precipitate along the length of the specimen. Experimental investigation were carried out to study the wear behavior for the specimens processed with lateral vibrations and without lateral vibrations. © 2019 Author(s).
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    Study of tribological characteristics of Al-Si based directional solidified FGM with graphite end chill
    (American Institute of Physics Inc. claims@aip.org, 2020) Ramesh Babu, N.R.; Ramesh, M.R.; Murthy, R.N.; Sudheer Reddy, J.S.; Aithal, S.K.; Manjunath, H.N.
    The present work is to study the wear characteristics of graphite reinforced Al-Si based functionally Graded materials (FGMs). FGM were fabricated through directional solidification (DS) technique. To achieve this graphite chill were incorporated at the end of the mold. The accomplished FGM are explored for microstructure and tribological properties to study the significance of end chill. The microstructure is analysed using optical microscope, showed that the number of silicon particles present at the top portion is more when compared to the bottom portion. The tribological studies showed that top portion of FGM exhibited highest wear resistance in compared to the bottom portion. © 2020 Author(s).