| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
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Phase Transformations and Microstructural Evolution
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| Presentation Title |
The effect of Ti:Ta ratio on the microstructure and elemental phase partitioning in high Co-containing powder-processed polycrystalline Ni-based superalloys for turbine disc applications |
| Author(s) |
Frances Synnott, Paraskevas Kontis, Lewis Owen, Nick Jones, Howard Stone, Mark Hardy, Katerina Christofidou |
| On-Site Speaker (Planned) |
Frances Synnott |
| Abstract Scope |
In this work, the varying co-additions of Ti and Ta in three powder-processed polycrystalline Ni-based superalloys were investigated using computational methods, microscopy, synchrotron X-ray diffraction, and atom probe tomography (APT) to elucidate their effects within the microstructure. The microstructures were characterised to understand the relative compositions of the γ, γ' and carbide phases and their evolution as a function of heat treatment. In-situ high-temperature X-ray diffraction was used to determine lattice misfit and thermal expansion of the associated phases. The compositions with higher Ta showed an increase of the MC fraction and improved thermal stability of the carbide. APT results showed a change in elemental phase partitioning for the secondary and tertiary γ' precipitates. The results obtained will be discussed in the context of alloy design. This work was supported by Rolls-Royce plc, and the EPSRC [EP/S022635/1]. Data was collected at the Diamond Light Source [EE9270] and the ESRF [ME1344]. |
| Proceedings Inclusion? |
Planned: |