Dr Katerina (Kathy) Christofidou

Dr Kathy ChristofidouLecturer in Metallurgy
PhD in Materials Science and Metallurgy (Cambridge)
MEng in Aerospace Materials Engineering (Imperial College London)

Email: k.christofidou@sheffield.ac.uk
Twitter: @KathyChr

Address: Department of Materials Science & Engineering, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD

Kathy Christofidou joined the department in 2019 as a Lecturer in Metallurgy. Prior to this role, she held roles at the University Cambridge, as part of the Rolls-Royce University Technology Centre, and the University of Manchester, where she also worked in close collaboration with the Henry Royce Institute. She holds a PhD in Metallurgy from the University of Cambridge and an MEng in Aerospace Materials Engineering from Imperial College London.


Kathy's research focuses on multiple facets of high temperature physical metallurgy, alloy design and manufacturing. As part of her collaboration with Rolls-Royce plc, she has developed new polycrystalline Ni-based superalloys for turbine disc applications, as well as exploring strategies for the design of high temperature materials amenable to laser-based additive layer manufacturing. In addition, a major area of her research interests is that of high entropy alloys and the possibilities that these materials offer for expanding our understanding of physical metallurgy beyond a single base element and the associated thermodynamic principles governing this behavior.

Professional activities and recognition
  • Member of the IoM3 Materials Chemistry Committee
  • Member of the TMS High Temperature Alloys Committee
  • Recipient of funding allocation from the Women in Engineering Visitor Funding Scheme at the University of New South Wales, Sydney, Australia
  • 2019 Materials travel award

Recent and key publications

  1. M.E. Bloomfield, K.A. Christofidou, N.G. Jones, Effect of Co on the phase stability of CrMnFeCoxNi high entropy alloys following long-duration exposures at intermediate temperatures, Intermetallics. 114 (2019) 106582.
  2. A.J. Goodfellow, L.R. Owen, K.A. Christofidou, J. Kelleher, M.C. Hardy, H.J. Stone, The Effect of Temperature and Mo Content on the Lattice Misfit of Model Ni-Based Superalloys, Metals. 9 (2019).
  3. E.J. Pickering, K.A. Christofidou, H.J. Stone, N.G. Jones, On the design and feasibility of tantalum-base superalloys, JALCOM. 804 (2019) 314–321.
  4. K.A. Christofidou, T.P. McAuliffe, P.M. Mignanelli, H.J. Stone, N.G. Jones, On the prediction and the formation of the sigma phase in CrMnCoFeNix high entropy alloys, JALCOM. 770 (2019) 285–293.
  5. K.A. Christofidou, M.C. Hardy, H.-Y. Li, C. Argyrakis, H. Kitaguchi, N.G. Jones, et al., On the Effect of Nb on the Microstructure and Properties of Next Generation Polycrystalline Powder Metallurgy Ni-Based Superalloys, Metall Mater Trans A. 49 (2018) 3896–3907.
  6. L.D. Connor, P.M. Mignanelli, K.A. Christofidou, N.G. Jones, A.R. Baker, C.C. Tang, et al., In situ study of sigma phase formation in Cr-Co-Ni ternary alloys at 800degreesC using the long duration experiment facility at Diamond Light Source, J. Synchrotron Rad (2018). 25, 1371-1378.
  7. K.A. Christofidou, E.J. Pickering, P. Orsatti, P.M. Mignanelli, T.J.A. Slater, H.J. Stone, et al., On the influence of Mn on the phase stability of the CrMnxFeCoNi high entropy alloys, Intermetallics. 92 (2018) 84–92.
  8. A.J. Goodfellow, E.I. Galindo-Nava, K.A. Christofidou, N.G. Jones, C.D. Boyer, T.L. Martin, et al., The effect of phase chemistry on the extent of strengthening mechanisms in model Ni-Cr-Al-Ti-Mo based superalloys, Acta Mater. 153 (2018) 290–302.
  9. A.J. Goodfellow, E.I. Galindo-Nava, K.A. Christofidou, N.G. Jones, T. Martin, P.A.J. Bagot, et al., Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy, Metall Mater Trans A. (2018) 1–11.
  10. S.C.H. Llewelyn, K.A. Christofidou, V.J. Araullo-Peters, N.G. Jones, M.C. Hardy, E.A. Marquis, et al., The effect of Ni:Co ratio on the elemental phase partitioning in γ-γ′ Ni-Co-Al-Ti-Cr alloys, Acta Mater. 131 (2017) 296–304.
  11. K.A. Christofidou, K.J. Robinson, P.M. Mignanelli, E.J. Pickering, N.G. Jones, H.J. Stone, The effect of heat treatment on precipitation in the Cu-Ni-Al alloy Hiduron® 130, Mater Sci Eng A. 692 (2017) 192–198.
  12. N.G. Jones, R. Izzo, P.M. Mignanelli, K.A. Christofidou, H.J. Stone, Phase evolution in an Al0.5CrFeCoNiCu High Entropy Alloy, Intermetallics. 71 (2016) 43–50.
  13. K.A. Christofidou, N.G. Jones, M.C. Hardy, H.J. Stone, The Oxidation Behaviour of Alloys Based on the Ni–Co–Al–Ti-Cr System, Oxid Met. 85 (2015) 443–458.
  14. K.A. Christofidou, N.G. Jones, E.J. Pickering, R. Flacau, M.C. Hardy, H.J. Stone, The microstructure and hardness of Ni- Co-Al-Ti-Cr quinary alloys, JALCOM. 688 (2016) 542–552.
  15. N.G. Jones, K.A. Christofidou, H.J. Stone, Rapid precipitation in an Al 0.5CrFeCoNiCu high entropy alloy, Mater Sci Technol. 31 (2015) 1171–1177.
  16. N.G. Jones, K.A. Christofidou, P.M. Mignanelli, J.P. Minshull, M.C. Hardy, H.J. Stone, Influence of Elevated Co and Ti Levels on Polycrystalline Powder Processed Ni-base Superalloy, Mater Sci Technol. 30 (2014) 1853–1861.
  17. M. C. Hardy, H. J. Stone, N. G. Jones, S. Neumeier and K. A. Christofidou, “A nickel alloy,” Patent Granted: EP20150199133 & US 10138534 B2