Mwita, Wambura Mwirryeni (PhD)
Wambura Mwiryenyi Mwita was born in Mara, Tanzania. He graduated with a Bachelor of Science in Mechanical Engineering from the University of Dar es Salaam in 2001. In 2011, he was awarded the Master of Technology in Mechanical Engineering by Cape Peninsula University of Technology. In 2017, he registered for doctorate degree studies at the University of Johannesburg. Wambura is a registered Graduate Mechanical Engineer with the Engineers Registration Board of Tanzania and works in Tanzania. Severe plastic deformation (SPD) is one of advanced materials processes applied to enhance titanium alloys with improved microstructural and mechanical properties for biomedical and structural application. However, most of SPD processes are discontinuous, and the processed samples exhibit lack of homogeneity of the tailored properties. In this study, a new SPD process, known as constrained bending and straightening (CBS), was proposed. Experimental and numerical methods were employed to investigate the capability of the CBS for a continuous process of titanium alloy grade-5 sheets with improved magnitude and homogeneity of microstructural and mechanical properties. Results revealed that the CBS processed material had significant increases in magnitude and homogeneity of the effective plastic strain, hardness, tensile strength and microstructural grain refinement. The study has quantitatively demonstrated that CBS is a viable and an alternative SPD method for continuous processing of titanium sheets with homogeneous properties.
Supervisor: Prof ET Akinlabi
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