| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advancing Current and State-of-the-Art Application of Ni- and Co-based Superalloys
|
| Presentation Title |
Segregation at Planar Defects in Model NiCo-based Superalloys |
| Author(s) |
Sae Matsunaga, Dongsheng Wen, Michael Titus |
| On-Site Speaker (Planned) |
Sae Matsunaga |
| Abstract Scope |
Ni-based superalloys have been widely used for high-temperature applications such as turbine blades for jet propulsion and power plants due to their excellent creep, fatigue, and corrosion resistance. Recently researchers have observed solute segregation at stacking faults, antiphase boundaries, and coherent twin boundaries in both Ni- and Co-based superalloys. Solute segregation to these planar defects has been correlated to high temperature mechanical properties, but the fundamental driving forces and mechanisms of solute segregation is still largely not understood. We hypothesize that the presence of Co provides a driving force for segregation to planar defects. As such, model gamma’-containing Ni-30Co-Al-X (X=Ti, Ta, Nb) alloys have been investigated. Our recent results of high temperature mechanical testing and high-resolution electron microscopy will be presented and compared to first-principles density functional theory calculations. Alloy design strategies for enhancing high temperature mechanical properties in Ni-based superalloys will be discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |