DEPARTMENT OF MECHANICAL ENGINEERING

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Author: search.filters.author.Ibitoye, S. A.Has files: Yes

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    The effect of A5TB refiner on the fatigue strength of 6063Al alloy
    (2010) Ibitoye, S. A.; Adeleke, A. A.; Oluwole, O. O.; Tiamiyu, A. O.; Ode, E. B
    The study focuses on the influence of aluminium titantium boron (ASTB) master alloy on the fatigue behaviour at 6063Al alloy. Cylindrical cast rods of 6063Al containing different proportions of A5TB ranging from 0-0.11 wt% were produced and were machined to conform to a standard fatigue specimen. The test specimens prepared were tested for fatique strength at various stress levels, and results obtained were compared. The resistance to fatique failure was observed to decrease as the stress level increased. It was also noted that irrespective of stress level, the optimum fatique strength was obtained when the A5TB content was about 0.06 wt%. It was found that 6063Al alloy to which A5TB master alloy have been added was most suitable for the design of components meant to operate under cyclic loading at low stresses below about 3.02KN/m2.
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    TMAZ microcracking in inertia friction welding of PM RR1000 superalloy: concomitant effect of constitutional liquating particles
    (2010) Oluwasegun, K. M.; Ibitoye, S. A.; Oluwole, O. O.
    The effect of constitution liquidation of strengthening particles in PM RR1000 superalloy in response to inertia friction welding process was investigated. The thermomechanical affected zone(TMAZ) microstructures were simulated using Gleeble® thermomechanical simulation system. The microstructural examination of the simulated TMAZs and those from the actual welded specimens showed the occurance of extensive grain boundary liquidation of the main strengthening phase ƴ and MC type carbide and consequently attendant microcracking in the TMAZ of the alloy. The existence of these particles in the temperature range well above thier solvus temperatures orchestrated the eutectic type reaction to their constitutional liquidation and subsequent cracking of the weldment.