Volume 5, Issue 2 , 2017

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https://ir.unilag.edu.ng/handle/123456789/3815

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Browsing Volume 5, Issue 2 , 2017 by Author "Agbeleye, A.A"

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  • Item
    Open Access
    The Effect of Process Parameters on Mechanical and Wear Properties of Alluminium-fired Clay Composites
    (University of Lagos Press, Akoka, 2017) Agbeleye, A.A; Hassan, S.B; Esezobor, D.E; Balogun, S.A; Agunsoye, J.O
    In this paper, the mechanical and tribological behaviours of as cast and rolled samples of Aluminium AA1070/fired clay (Al-Clay) composites were studied. The composites were developed through stir casting route with 0-20 wt.% clay particles of grain sizes250, 177 and 150 μm. The samples were cold rolled to final reduction of 20 and 35%.Hardness, tensile, impact and wear tests were performed on the developed composite samples and their microstructure were examined to determine the phases present in the composite. The results showed improvement in the mechanical and wear properties of Al-Clay composites with increase in wt.% clay addition. Increase in percent reduction also showed a reasonable increase in the mechanical and wear properties of the rolled samples. The results obtained clearly shows that Al-clay composite can be produced by stir casting and possess superior properties to the Aluminium AA1070 in terms of wear properties, impact energy, tensile strength as well as hardness.
  • Item
    Open Access
    Mechanical and Wear Characteristics of Aluminium Brass
    (University of Lagos Press, Akoka, 2017) Esezobor, D.E; Agbeleye, A.A; Onovo, H.O; Bodude, M.A
    In this paper, the influence of the processing parameters on the wear and mechanical properties of 5 – 12 % aluminum red brass (Al-brass) was studied. The wear characteristics of developed Al brass in dry sliding conditions were exposed through a series of pin-on-disc sliding wear tests. Three load levels of 2, 7 and 12N, sliding speeds of 125 and 250 rpm and two sliding distances of 392.7 and 785.4m were investigated. The mechanical properties of the Al brass were determined using standard techniques. The results showed an increase in tensile strength from 225 MPa at 5 % aluminum addition to a maximum of 248 MPa at 10% Al and then a decline to 240 MPa at 12 % Al. The peak stress value increases as the weight percentage composition of Al increases until at 11%Al when it reduces. The impact energy and the hardness values of the as-cast Al brass rose from 54.2 Joules and 81HRC to 122 Joules and 92.4 HRC respectively at 12 % aluminum addition. At lower load of 2N, the addition of 5 % of Al brought a drastic improvement (65 %) to the wear resistance at 125 rpm and 250rpm, but the improvement became consistent thereafter. The same trends occurred at load of 7 N, but with lower degree of improvement (approximately 40 %). In contrast, under higher load of 12 N, the addition of Al brought slight and consistent improvement (10 -15 %) to the wear resistance.