About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in the State-of-the-Art of High Temperature Alloys
|
| Presentation Title |
Designing Next Generation Superalloys by Revealing Atomic-Scale Solute-Defect Interactions in Creep Deformed CMSX4 Superalloy |
| Author(s) |
Punam Pragya, Shashidhar Gangavarapu, Akshat Godha, Surendra Kumar Makineni |
| On-Site Speaker (Planned) |
Surendra Kumar Makineni |
| Abstract Scope |
Single-crystal Ni-base superalloys are multi-element (> ~10 elements) alloys that are critical for the parts of high-temperature turbine engines. Over the years, multiple generations of superalloys were developed, where the latest compositions involve dense and Rare-Earth elements such as Re and Ru (up to 6 wt.%), making them heavier and costlier. Hence, it has a direct negative impact on engine efficiency and higher CO2 emissions.
Here, we use APT in correlation with electron microscopy to reveal the effect of solutes on the plastic deformation under stress at high temperature in a 2nd generation CMSX-4 Ni-base single-crystal alloy. The results indicate compositional variation of solutes along the twin boundaries, and based on segregation behavior, other than Re, the possible creep rate-limiting solutes were identified, and new compositions were designed with lower Re (by 1.5 wt.%) content. These show exceptional creep resistance compared to the base CMSX-4 composition in polycrystalline form. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, High-Temperature Materials, Phase Transformations |