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Materials Engineering Group

Materials Engineering / Students / David Githinji

David Githinji
+44 (0) 7466 895 320
+44 (0) 1908 653 594
Venables Room S2037

Student Project

Surface-based characterisation techniques for creep deformation and damage

Academic supervisors
Professor John Bouchard
Dr. Shirley Northover
Dr. Martin Rist

David Githinji
David Githinji

Background :

I am David Githinji. My country of origin is Kenya where I did my undergraduate studies in engineering graduating with a first class honours degree. I worked for two years in manufacturing industries in quality management before joining Moi University (Kenya) as research assistant. I pursued a masterís degree in Advanced Materials at Nottingham University (UK) graduating with a distinction in 2010. I investigated the applicability of metallic coatings on aerospace material (carbon/epoxy composite) using cold-gas dynamic spraying technique as part of my masters dissertation.

PhD Project :

The current project encompasses both microscopy and metallurgy fields as it entails the use of electron diffraction in studying microstructural evolution during creep. Essentially, electron backscatter diffraction (EBSD) technique will be used to study the mechanism in which creep occurs in heat affected zone (HAZ) of type 316 stainless steel. EBSD is a scanning electron microscope (SEM) based technique which is now commonly used in determination of crystallographic textures, crystal structures, phases, grain boundary properties, elastic and plastic deformations.

The technique works well with crystalline structures and is sensitive to intrinsic materialís defects. It can therefore be used to quantify the degree of deformation a material has experienced. Unique correlations have been established between deformations in material and some of the EBSD parameters. The aim of the current project is to explore these correlations and ultimately develop a method of quantifying creep deformation and damage in high temperate materials.





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