Investigating the self-healing behaviour of under-aged and 60Sn-40Pb alloy reinforced aluminium hybrid composites
- Oladijo, O.P., Bodunrin, M.O., Sobiyi, K., Maledi, N.B., Alaneme, K.K.
- Authors: Oladijo, O.P. , Bodunrin, M.O. , Sobiyi, K. , Maledi, N.B. , Alaneme, K.K.
- Date: 2016
- Subjects: Aluminium hybrid , Self –healing , Bamboo leaf
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/214329 , uj:21267 , Citation: Oladijo, O.P. et al. 2016. Investigating the self-healing behaviour of under-aged and 60Sn-40Pb alloy reinforced aluminium hybrid composites.
- Description: Abstract: An experimental investigation was carried out to assess the self-healing characteristics of aluminium hybrid composites reinforced primarily with mixed proportion of silica sand and bamboo leaf ash. Charpy impact test samples with 45° notch were machined from the aluminium hybrid composites and a ϕ1mm hole was drilled at 1mm away from the notch. Two different self-healing treatments were given to the test samples prepared from the composites. In the first treatment, a 3mm diameter hole was drilled along the sample and a low melting point alloy (60Sn-40Pb) which served as secondary reinforcing material was pierced into the hole and then heat treated at a temperature of 250°C. The second treatment that was adopted involved subjecting the test samples to two-steps under-ageing treatment. The first step involved ageing at 160°C for 15 minutes and quenched in water. Thereafter, the second ageing treatment was carried out at 50°C for 24h. The samples were then subjected to Charpy impact testing. The results show that the composites had lower absorbed energy compared with Al- Mg-Si alloy. Self-healing treatment improved the energy absorbed in healed samples when compared to the damaged samples. Although, the under-aged samples had a slightly higher absorbed energy in comparison with the samples containing 60Sn-40Pb, the presence of silica sand and bamboo leaf ash did not have significant influence on the absorbed energy. The highest healing efficiency obtained using the low melting point alloy approach was 61%.
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- Authors: Oladijo, O.P. , Bodunrin, M.O. , Sobiyi, K. , Maledi, N.B. , Alaneme, K.K.
- Date: 2016
- Subjects: Aluminium hybrid , Self –healing , Bamboo leaf
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/214329 , uj:21267 , Citation: Oladijo, O.P. et al. 2016. Investigating the self-healing behaviour of under-aged and 60Sn-40Pb alloy reinforced aluminium hybrid composites.
- Description: Abstract: An experimental investigation was carried out to assess the self-healing characteristics of aluminium hybrid composites reinforced primarily with mixed proportion of silica sand and bamboo leaf ash. Charpy impact test samples with 45° notch were machined from the aluminium hybrid composites and a ϕ1mm hole was drilled at 1mm away from the notch. Two different self-healing treatments were given to the test samples prepared from the composites. In the first treatment, a 3mm diameter hole was drilled along the sample and a low melting point alloy (60Sn-40Pb) which served as secondary reinforcing material was pierced into the hole and then heat treated at a temperature of 250°C. The second treatment that was adopted involved subjecting the test samples to two-steps under-ageing treatment. The first step involved ageing at 160°C for 15 minutes and quenched in water. Thereafter, the second ageing treatment was carried out at 50°C for 24h. The samples were then subjected to Charpy impact testing. The results show that the composites had lower absorbed energy compared with Al- Mg-Si alloy. Self-healing treatment improved the energy absorbed in healed samples when compared to the damaged samples. Although, the under-aged samples had a slightly higher absorbed energy in comparison with the samples containing 60Sn-40Pb, the presence of silica sand and bamboo leaf ash did not have significant influence on the absorbed energy. The highest healing efficiency obtained using the low melting point alloy approach was 61%.
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Corrosion inhibition of mild steel in acidic solution by cow dung extract as an eco-friendly inhibitor
- Olusegun, S.J., Oluwasina, O.O., Alaneme, K.K., Olubambi, P.A.
- Authors: Olusegun, S.J. , Oluwasina, O.O. , Alaneme, K.K. , Olubambi, P.A.
- Date: 2016
- Subjects: Corrosion inhibition , Mild steel , Cow dung
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/217614 , uj:21662 , Citation: Olusegun, S.J. et al. 2016. Corrosion inhibition of mild steel in acidic solution by cow dung extract as an eco-friendly inhibitor. Journal of materials and environmental science, 7(4):1086-1097 , ISSN: 2028-2508
- Description: Abstract: The anti corrosion potential of cow dung was assessed using weight loss, Electrochemical techniques, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) along with Energy dispersive spectroscopy (EDS), and Atomic absorption spectroscopy (AAS). The results show that cow dung extract (CDE) possesses good inhibition properties. The inhibition efficiency was found to increase with concentration but decrease with temperature. The highest inhibition efficiency obtained was 91% at 303K. Potentiodynamic polarization result suggests that CDE functioned as a mixed-type inhibitor. The AAS analysis shows that the concentration of Fe2+ in the electrolyte decreases with increase in the extract concentration. The adsorption of extract on the metal surface followed both Langmuir and Freundlich adsorption isotherms though Langmuir model better explained the adsorption process involved.
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- Authors: Olusegun, S.J. , Oluwasina, O.O. , Alaneme, K.K. , Olubambi, P.A.
- Date: 2016
- Subjects: Corrosion inhibition , Mild steel , Cow dung
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/217614 , uj:21662 , Citation: Olusegun, S.J. et al. 2016. Corrosion inhibition of mild steel in acidic solution by cow dung extract as an eco-friendly inhibitor. Journal of materials and environmental science, 7(4):1086-1097 , ISSN: 2028-2508
- Description: Abstract: The anti corrosion potential of cow dung was assessed using weight loss, Electrochemical techniques, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) along with Energy dispersive spectroscopy (EDS), and Atomic absorption spectroscopy (AAS). The results show that cow dung extract (CDE) possesses good inhibition properties. The inhibition efficiency was found to increase with concentration but decrease with temperature. The highest inhibition efficiency obtained was 91% at 303K. Potentiodynamic polarization result suggests that CDE functioned as a mixed-type inhibitor. The AAS analysis shows that the concentration of Fe2+ in the electrolyte decreases with increase in the extract concentration. The adsorption of extract on the metal surface followed both Langmuir and Freundlich adsorption isotherms though Langmuir model better explained the adsorption process involved.
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Fracture toughness and tribological wear behaviour of micro alloyed pearlitic- ferritic ductile cast iron
- Omole, S.O., Oyetunji, A., Alaneme, K.K., Olubambi, P.A.
- Authors: Omole, S.O. , Oyetunji, A. , Alaneme, K.K. , Olubambi, P.A.
- Date: 2018
- Subjects: Wear , Alloyed , Fracture
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/289571 , uj:31420 , Citation: Omole, S.O. et al. 2018. Fracture toughness and tribological wear behaviour of micro alloyed pearlitic- ferritic ductile cast iron. Vol. 40, No. 4 (2018) 584-593, DOI: 10.24874/ti.2018.40.04.07.
- Description: Abstract: Fracture toughness and wear behaviour of micro alloyed ductile iron were investigated. Hardness, fracture, fracture toughness and wear tests were carried out on the ductile irons samples (D1, D2, D3, D4 and D5), containing micro alloyed nickel, molybdenum, copper and chromium in an amount of 0.2 % or less. They were characterized using optical metallurgical microscope and they contained pearlitic- ferritic matrix structure. They were subjected to wear test at room temperature based on pin-on-disk operation. Fracture surfaces and the wear track were studied using scanning electron microscope and found that the fracture surfaces majorly consist of fibrous with little cleavage fracture pattern in some samples. Wear mechanism is delamination with adhesive wear behavior. The specific wear rate was found to decrease with increasing hardness of the material and coefficient of friction of the ductile irons during test.
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- Authors: Omole, S.O. , Oyetunji, A. , Alaneme, K.K. , Olubambi, P.A.
- Date: 2018
- Subjects: Wear , Alloyed , Fracture
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/289571 , uj:31420 , Citation: Omole, S.O. et al. 2018. Fracture toughness and tribological wear behaviour of micro alloyed pearlitic- ferritic ductile cast iron. Vol. 40, No. 4 (2018) 584-593, DOI: 10.24874/ti.2018.40.04.07.
- Description: Abstract: Fracture toughness and wear behaviour of micro alloyed ductile iron were investigated. Hardness, fracture, fracture toughness and wear tests were carried out on the ductile irons samples (D1, D2, D3, D4 and D5), containing micro alloyed nickel, molybdenum, copper and chromium in an amount of 0.2 % or less. They were characterized using optical metallurgical microscope and they contained pearlitic- ferritic matrix structure. They were subjected to wear test at room temperature based on pin-on-disk operation. Fracture surfaces and the wear track were studied using scanning electron microscope and found that the fracture surfaces majorly consist of fibrous with little cleavage fracture pattern in some samples. Wear mechanism is delamination with adhesive wear behavior. The specific wear rate was found to decrease with increasing hardness of the material and coefficient of friction of the ductile irons during test.
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