| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments II
|
| Presentation Title |
Radiation-induced Partial Disordering of Heusler Phase in Intermetallic Dispersion Strengthened Ferritic Superalloys |
| Author(s) |
Kan Ma, Robert Abernethy, Sophia von Tiedemann, Nianhua Peng, Graeme Greaves, Anamul H Mir, Christina Hofer, Thomas W Pfeifer6, Kai Sun, Lumin Wang, Pedro A Ferreirós, Christopher D Hardie, Alexander Knowles |
| On-Site Speaker (Planned) |
Kan Ma |
| Abstract Scope |
Advanced steels strengthened by intermetallics have been in rapid development in the last decade. Mirroring to Ni superalloys, a new class of ferritic steels, ferritic “bcc-superalloys”, have been designed comprising a disordered body-centred cubic (bcc) matrix reinforced by ordered-bcc intermetallics, such as B2-NiAl and L21-Ni2AlTi. The A2-B2/L21 microstructure meets strategies to create radiation-tolerant materials: utilising a radiation-resistant body-centred cubic (bcc) matrix and a large interface area as sinks for point defects. However, their irradiation behaviour is still rarely known. This work addresses novel ferritic superalloys FeNiAlTi, comprising nanoscale L21 precipitates with various sink strengths. Ex-situ irradiation with Fe+ ions at 300°C was performed followed by nano-indentations to study the radiation-induced hardening. Transmission electron microscopy and atom probe tomography were conducted to study the irradiated microstructure. A partial disordering of the L21 phase into a B2 phase was revealed. In-situ experiments showed that the disordering depends on the temperature and dose. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Characterization, Phase Transformations |