| 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 |
Probing Effects of Alloying Additions and Local Phase Transformation Strengthening on Creep Deformation 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 |
Historically, nickel based superalloys have been designed using classical, empirically-based metallurgy principals, but this is no longer sufficient. Physics based models connecting composition, microstructure and properties are needed to enable rapid and cost-effective alloy development. Our work supports this by probing effects of critical alloying additions found to promote Local Phase Transformation (LPT) strengthening, which occurs along planar defects and benefits creep resistance. The effects of LPT promoters on creep properties were elucidated by performing compression creep tests on compositionally simplified alloys, as well as studying several commercial alloys, thereby exploring desired composition regimes. Scanning Transmission Electron Microscopy and Atom Probe Tomography were coupled to analyze both local atomic structure and associated segregation events of the deformation processes occurring. This work will serve to inform future studies involving modeling and simulation, as well as materials data analytics, to enable rapid alloy design with predicted mechanical response. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |