Browsing by Author "Aremu, I. N."
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Item Assessment of deformation twinning in cold rolled austenitic stainless steels with electron back scatter diffraction(Faculty of Engineering and Technology, University of Ilorin, Nigeria, 2014) Ahmed, I. I.; Wright, D.; Adebisi, J. A.; Aremu, I. N.; Yahaya, T.; da Fonseca, J. Q.Deformation twinning has traditionally been studied with Transmission Electron Microscopy (TEM). In this study, an assessment of deformation twinning in Austenitic Stainless Steel (ASS), type 304L, cold rolled to 20% reduction was investigated using Scanning Electron Microscopy (SEM) and Electron Back Scatter Diffraction (EBSD) techniques rather than the conventional TEM. The study revealed the presence of deformation twins in the cold rolled grains of ASS. It emerged from the study that the deformation twins observed may facilitate localised heterogeneous deformation and development of internal stresses within the grain.Item Production of Abrasive Sandpaper Using Periwinkle Shell and Crab Shell(Dhaka University of Engineering & Technology, Gazipur, Bangladesh, 2020) Ambali, I. O.; Shuaib-Babata, Y. L.; Abdulqadir, L. B.; Ibrahim, H. K.; Aremu, I. N.; Ibrahim, T. O.In this study, the properties of periwinkle shell and crab shell grains, such as hardness, compressive strength and wear resistancewere examinedfor their suitability as abrasive materials. The binding effect of polyester resin at high concentrationwas also considered. Through the processof crushing, grinding and subsequently sieving using ASTM E11 set of sieves, the shells were processedinto grit standards grain sizes of P40 and P60. Furthermore, by mixing and mould compression using a hydraulic press polymer matrix composite with particles varying from 96 wt.% to 92 wt.% and resin 3 wt.% to 7 wt.% with 1 wt.% each of cobalt naphthalene and methyl ethyl ketone peroxide hardenerrespectively were developedfrom the grits. It was found that, with an increase in polyester resin content, thehardness and compressive strength increased, while the wear rate decreased. The composition with 92 wt.% periwinkle shell grains to 7 wt.% polyester resin was found to be with the most improved abrasive properties.Item Stress corrosion cracking of austenitic stainless steels in chloride environment(Faculty of Engineering, Ahmadu Bello University, Zaria, Nigeria, 2015) Ahmed, I. I.; Alabi, A. G. F.; Odusote, J. K.; Aremu, I. N.; Adebisi, J. A.; Yahaya, T.; Talabi, S. I.; Yahya, R. A.; Lyon, S. B.This study was carried out to assess the effect of applied potentials on Stress Corrosion Cracking (SCC) of Austenitic Stainless Steels (ASS), Type 304L in a potentiostatically controlled chloride environment at ambient temperature. The stress corrosion cracking tests were carried out on annealed ASS using a Slow Strain Rate Test (SSRT) technique in sodium chloride solution acidified with hydrochloric acid at ambient temperature. Analyses of failed specimens were carried out using optical microscope. The study showed that plastic elongation, ultimate tensile strength and time to failure decrease as the applied potential increases during the slow strain rate test. The study showed that immunity of ASS to chloride SCC was improved when the electrochemical potential was maintained in the primary passive potential range. Analysis of failed samples showed evidences of SCC.Item Suitability of Cow Horn as Filler in an Epoxy Composite(University of Port Harcourt, World Bank Assisted National Agricultural Research Programme (NARP) Publisher, 2019-03) Ambali, I. O; Shuaib-Babata, Y. L.; Alasi, T. O.; Aremu, I. N.; Ibrahim, H. K.; Abdulraaman, S. O.This study focuses on assessment of cow horn as filler in an epoxy composite. A particle-reinforced composite was developed using horn particles (HP) and epoxy resin with filler of varying percentage weight (5%, 10%, 15%, 20%. 25%, 30%, 35%, 40 %) at particle sizes of 100 and 150 μm. The composites were developed by hand lay-up technique with varying process parameters. The properties of the developed composites were examined through tensile, flexural and impact tests. The results showed that the tensile properties of the polymers reduced with the incorporation of the cow horn as filler. But at higher curing temperature, a better strength was achieved. Meanwhile, the flexural and impact properties of the polymers increased with the incorporation of the fiber in no particular order. The composite materials with particle size of 100 μm with curing temperature of 80oC exhibited higher tensile (37.58 MPa) and impact properties (74 J) than the lower particles. Generally, the cow horn was found to be a good potential filler in the composite if prepared using higher curing temperature as exhibited through its mechanical properties.