About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Local Phase Transformation Strengthening in Ni-based Superalloys |
| Author(s) |
Ashton J. Egan, Timothy Smith, You Rao, Longsheng Feng, Emmanuelle Marquis, Maryam Ghazisaeidi, Yunzhi Wang, Steve Niezgoda, Michael Mills |
| On-Site Speaker (Planned) |
Ashton J. Egan |
| Abstract Scope |
In the intermediate temperature creep regime of Ni-based superalloys (~700 °C) deformation is dominated by planar defects and microtwinning, where deformation response is controlled by segregation events surrounding the leading partial dislocations. Of particular interest are alloys exhibiting Local Phase Transformation (LPT) along planar defects, a dynamic process whereby the alloy can be strengthened during service. The propensity for LPT strengthening depends on the relative ratio of η and/or χ formers, depending on active mechanisms, and in this study the LPT composition regime was explored with several commercial and novel alloys. Advanced characterization of the deformation mechanisms and LPT was accomplished by Scanning Transmission Electron Microscopy (STEM), Energy Dispersive X-Ray Spectroscopy (EDS) and Atom Probe Tomography (APT), while being supported by density functional theory (DFT) and phase field computational techniques. Understanding these complex phenomena is crucial in creating a physically-based, constitutive creep model. |
| Proceedings Inclusion? |
Planned: |