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Atomistic Simulation @ Cambridge

Department of Materials Science & Metallurgy

Studying at Cambridge

 

Ni-based Superalloys

E. Schmidt and P.D. Bristowe

Sponsors: EPSRC and Rolls Royce PLC

  • Atomistic calculations of faulted superlattice structures, precipitates and interfaces.
  • Effect of alloying additions (Ti, Ta, W).
  • Collaboration with the Rolls-Royce UTC

Research Highlight

Thermodynamic stability and electronic structure of η-Ni6Nb(Al,Ti) from first principles

N. Eurich and P. D. Bristowe, Scripta Mater. 77, 37-40 (2014)

First principles calculations in combination with special quasirandom structures are used to investigate the thermodynamic stability and electronic structure of a partially ordered hexagonal phase with chemistry Ni6Nb(Al,Ti) observed in Allvac 718Plus. The results agree with the experimental observations by confirming the structural stability of the alloy over a wide range of compositions. At finite temperature vibrational and configurational contributions to the free energy stabilise a competing orthorhombic phase which for high Ti concentrations is shown to become energetically favourable.

superalloys.jpg
First principles formation enthalpies of Ni6NbTi1-xAlx for various structures as a function of Ti concentration.