About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials Design Approaches and Experiences V
|
Presentation Title |
Designing for Local Phase Transformation Strengthening in Nickel Based Superalloys |
Author(s) |
Ashton J. Egan, Lola Lilensten, Paraskevas Kontis, Sammy Tin, Michael Mills |
On-Site Speaker (Planned) |
Ashton J. Egan |
Abstract Scope |
Physics-based models connecting composition, microstructure and properties are needed to enable rapid and cost-effective alloy development. Our work supports this process by probing effects of critical alloying additions found to promote Local Phase Transformation (LPT) strengthening, which occurs along planar defects and benefits creep resistance. Compositionally simplified alloys, based on studies investigating bulk phase formation, allow for exploration of composition regimes promoting LPT. Characterization of these alloys involved compression creep testing, which presented a unique challenge, as well as coupling atomic resolution Scanning Transmission Electron Microscopy and Atom Probe Tomography. More complex commercial and experimental alloys also exhibit LPT, and the role of this phenomenon in dictating the operative deformation mechanism at higher temperature will be discussed. Combining these characterization techniques allows for understanding of both local atomic structure and local three dimensional composition at defects, providing insight into these segregation events and directions for modeling of this phenomenon. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |