| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Sustainability of High Temperature Alloys
|
| Presentation Title |
Pushing the temperature limit of nickel-based superalloy |
| Author(s) |
PS Manoranjan Jena, Snehashish Tripathy, Bhupeshwar Mahato, Jitendra Kumar Sahu |
| On-Site Speaker (Planned) |
PS Manoranjan Jena |
| Abstract Scope |
Nickel-based superalloys operate within a temperature range of ~0.8Tm, exhibiting superior high-temperature mechanical strength attributed to the Yield Strength Anomaly (YSA). This phenomenon manifests as an increase in strength with rising temperature, but beyond a certain peak temperature (Tp), the strength begins to decrease. The YSA is primarily due to the formation of KW-locks within the L12 compounds, which occur when a/2<110> dislocations bounding an antiphase boundary (APB) on the {111} plane cross-slip to the {001} plane due to the anisotropy in the APB energy. The Tp can be controlled by the formation of these KW-locks, which is dependent on planar fault energy, including the APB energy and the complex stacking fault energy. The present research proposes a methodology for increasing the Tp by tailoring the planar fault energy of the L12 compounds, as confirmed through high-temperature mechanical testing of ternary and quaternary alloys with a 100% L12 structure. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, High-Temperature Materials |