Dual Superlattice Superalloys

Reducing emissions from civil aviation through increasing the efficiency of aeroengines requires the development of new alloys with superior mechanical properties and temperature capability. Recently, we have developed a novel class of dual-superlattice superalloys, which offer exceptional properties. However, their further development requires a detailed understanding of the effects of alloying additions on the stability and precipitation sequences. In this experiment, powder diffraction data will be acquired from six Ni-base superalloys, assessing the effects of Fe, W, Mo, Nb and Al additions on the solvus temperatures, lattice parameters and volume fractions of the precipitates. These data will be obtained through dynamic measurements during heating and cooling between RT–1000°C. The results will allow for a reliable assessment of their precipitation kinetics, gaining insight into the microstructures formed and guiding the optimisation of these alloys for service applications.