Volume 5, Issue 1, 2017

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https://ir.unilag.edu.ng/handle/123456789/3814

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Browsing Volume 5, Issue 1, 2017 by Author "Esezobor, D.E"

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  • Item
    Open Access
    Mechanical and Wear Behaviour of Heat Treated Aluminium-clay Composite
    (University of Lagos Press, Akoka, 2017) Agbeleye, A.A; Esezobor, D.E; Balogun, S.A; Agunsoye, J.O; Bodude, M.A
    In this paper, the mechanical and wear characteristics of T6 heat treated Al-Clay composite with 15 wt.% at 250μm particle size produced via stir casting method were studied. The samples were solutionised at 500, 550 and 600˚C then quenched in air, oil and water. The samples were artificially aged at 180˚C for 6 hours. Tensile and Vickers hardness tests were conducted on the sample in accordance with ASTM E8/E8M-13 standards. The wear tests were carried out on both pin-on-disc wear-testing machine and in dry sliding conditions at two different loads (4N and 10N) and three sliding speeds (200, 500 and 1000 rpm). Results show that the water quenched composite samples solutionised at 550˚C demonstrated superior mechanical and wear properties. The wear behaviour of the developed composite shows dependence on load, speed and the volume fraction of clay particles. From the results it is concluded that the mechanical and wear properties of Al 6063-clay composite can be enhancedthroughT6 heat treatment process.
  • Item
    Open Access
    Modelling and Simulation of Ecap and P-Cap Techniques of Grain Inducement in Mild Steel
    (University of Lagos Press, Akoka, 2017) Esezobor, D.E; Onovo, H.O; Ojo, A.O; Bodude, M.A
    Due to major obstacles associated with the powder consolidation methods of producing bulk nano materials such as high cost, contamination and porosity, severe plastic deformation (SPD) technology, specifically the equal channels angular pressing (ECAP) technique is used with modifications to numerically simulate the much needed grain refinement in steel. Attempts are made in this study to investigate influence of processing parameters such as deformation routes, temperature, load and number of processing passes on the degree of strain inducement in steel. This study however, aimed at developing fourth generation metals of exceptional strength, formability and toughness. The materials used in this work include conventional mild steel and ABAQUS commercial software. Simulation and modeling of the proposed deformation and ECAP techniques were done using finite element based-method (FEM). The results obtained indicate that the desired performance index of the metal is dependent on the state of the metal prior to ECAP and the degree of deformation.