Department of Mechanical Engineering

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Author: search.filters.author.Jamiu Kolawole OdusoteSubject: search.filters.subject.mechanical properties

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    Mechanical properties and microstructure of precipitation-hardened Al-Cu-Zn alloys
    (UMP Publisher, 2015-12-30) Jamiu Kolawole Odusote; Adekunle Akanni Adeleke; P. A. Ajayi
    Many automobile components are made from aluminium and its alloys because of their suitable properties. Metals and their alloys are usually subjected to heat treatment in order to improve their properties. Thus, the effect of precipitation hardening on the mechanical properties and microstructure of sand cast aluminum alloys was investigated. The cast AlCu-Zn alloy samples were heat-treated at 460 °C for 2 hours, quenched in water and then age-hardened at 160 °C for 5 hours. Tensile, impact and hardness tests were carried out on the heat-treated and the as-cast Al-Cu-Zn alloys samples. The surface morphology of both the as-cast and the precipitation hardened samples was observed using digital metallurgical microscope. The ultimate tensile strength of the precipitation hardened samples A2 (81.2Al: 1.56Cu: 8.33Zn) and B2 (81.7Al: 3.25Cu: 6.16Zn) are 173.42 N/mm 2 and 168.02 N/mm 2 , respectively. These values are higher than those of the as-cast samples A1 and B1, which are 168.02 N/mm 2 and 157.84 N/mm 2 , respectively. The precipitation hardened Al alloy samples also displayed higher hardness, impact energy and elongation than the as-cast samples, indicating improved properties. The presence of coarse reinforcing intermetallic phases was observed in the as-cast samples as compared to the well-distributed fine grain size microstructure of intermetallic phases in the precipitation hardened samples. It can be concluded that precipitation hardening improves the mechanical and microstructure properties of aluminum alloys and thus will find wider applications in automobile industries for the production of components and parts.
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    Effect of copper addition and solution heat treatment on the mechanical properties of aluminum alloy using formulated bio-quenchant oils
    (Engineering and Applied Science Research, 2020-01-01) Adekunle A.S.; Adekunle Akanni Adeleke; Peter Pelumi Ikubanni; Omoniyi P. O.; Gbadamosi T. A.; Jamiu Kolawole Odusote
    Addition of copper and use of solution heat treatment solution with bio degradable vegetable oils as quenchants has great potential to improve the mechanical properties of aluminum and its alloys. In this study, copper was added to as-received Al- Si-Mg alloy to produce Al-Si-Cu-Mg alloy. The specimens were quenched with blended bleached bio-quenchant oils and a petroleum-based oil after solution heat treatment. The alloy was heat treated at 500℃, soaked for 20 minutes in a muffle furnace before quenching in the formulated bio-quenchant oils. The cooling properties, mechanical properties and microstructure of the solution treated specimens were determined. Blended bleached melon (BBM) oil was observed to have offered a higher cooling rate of 49.3 ℃ s-1 compared to the petroleum-based (PB) oil with a cooling rate of 25.8 ℃ s-1. Blended bleached melon oil exhibited the highest quench severity value of 1.0074 m-1, while petroleum-based oil was 0.6133 m-1. The as-received alloy and as-cast alloy specimens exhibited tensile strength values of 125.33 and 131.37 N mm-2, respectively, while a higher tensile strength value of 139.30 Nmm-2 was obtained using the blended bleached melon oil. The highest Rockwell hardness number, 61.00 HRB, was obtained using blended bleached melon oil. The overall mechanical properties of specimens improved after the addition of copper and heat treatment in various bio-quenchant oils
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    Mechanical properties and microstructural evaluation of heat-treated aluminum alloy using formulated bio-quenchants
    (Akademiai Kiado, 2020-10-03) A. S. Adekunle; Tajudeen Adelani Gbadamosi; P.O. Omoniyi; Adekunle Akanni Adeleke; Peter Pelumi Ikubanni; Jamiu Kolawole Odusote
    Heat treatment industries require various quenching media to improve the properties of the materials to be quenched. Petroleum based mineral (PBM) oil, a non-biodegradable oil, is popular amongst others quenchants in heat treatment processes. Recently, biodegradable oils mostly in their raw, unblended and unbleached forms have been employed for quenching of various engineering materials. Therefore, the present study examined the effects of some selected bio-quenchants in blended raw (BR) and blended bleached (BB) forms on the mechanical properties and microstructure of solution heat treated aluminum (Al)-alloy. Edible vegetable oil (70% by volume) was blended with 30% by volume of jatropha oil to form the bio-quenchant oils. Another set of bio-quenchants were formed by bleaching the raw oils before mixing so as to reduce the oxidation level and contaminations in the oil. The Al-alloy is solution heat treated at 500 °C and soaked for 15 min in an electric muffle furnace before quenching in the various established bio-quenchants. Results showed that samples treated in blended raw melon (BRM) oil have higher tensile strength of 151.76 N/mm while samples quenched in blended bleached melon (BBM) oil have higher hardness value of 61.00 HRC. In accordance to the results obtained the bio-quenchants were found to be effective replacement to the PBM oil.