Grain Boundary Engineering
Additive Layer Manufacturing
Failure Analysis (Metals)
Chartered Engineer (CEng) – Institute of Materials, Minerals and Mining.
MIMMM status – Full member of the Institute of Materials, Minerals and Mining.
Postgraduate Taught Masters
Microstructural evaluation of joining/repair processes for aerospace applications
- Validation of a high integrity joining/repair process for aerospace applications
- Thermo-mechanical characterisation of a nickel super alloy
- Alternative Joining Techniques for Ti alloys Powder Interlayer Bonding
- High Integrity Joining and Repair of Gamma TiAl (2nd Supervisor)
- Fatigue Behaviour of Novel Titanium Alloys (2nd Supervisor)
Fatigue of Titanium alloys
Previous research has focussed upon low temperature dwell sensitivity in Titanium Alloys. During this period I pioneered the technique of Fracture facet orientation determination via Electron Backscatter diffraction (EBSD).
Current work is focussed upon validation of a powder bonding technology previously developed at Swansea to support generation of a micro-mechanical models.
Investigation into the early stages of the bonding process are being studied using a combination of metallographic and volumetric characterisation methods (e.g. X-ray CT).
Grain Boundary Engineering.
Grain boundary engineering is an approach designed to control the properties of materials by controlling the grain boundary character distribution (GBCD), mainly by promoting a high proportion of so-called special grain boundaries in them. Through a systematic modification of GBCD, mechanical properties such as strength, ductility, creep, and corrosion resistance can be improved. Sequential thermomechanical processing (such as mechanical deformation by cold rolling/tensile straining), followed by mid- or high- temperature annealing has been adopted to optimize microstructures, by increasing the fraction of special grain boundaries and breaking-up the interconnected random grain boundary network.
Research into GBE is now underway for Novel Aerospace alloys.
Semi-Solid Metal Joining.
Joining in the thixotropic state is considered to be an effective alternative joining method to welding because the material is processed when it is in a semisolid state between solidus and liquidus temperatures. Here the material shows thixotropic behaviour. Metal in a thixotropic state has many features such as high softness, good flowability, superb workability, and excellent join ability.
The key potential advantage of the semisolid joining of alloys is that it can avoid many of the problems (deterioration of the fracture toughness, corrosion resistance, and yield strength in the HAZ) because of the fact that the solidification and heat transfer processes are basically different from those of typical welding.
Ten years’ experience across a range of Departments within the Nickel Manufacturing Industry- Extensive knowledge of Nickel Powders/Pellets manufactured via Carbonyl Process.