| About this Abstract |
| Meeting |
2019 TMS Annual Meeting & Exhibition
|
| Symposium
|
Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys III
|
| Presentation Title |
Effect of Pre-deformation on the Aging Response of Co/Ni-base Superalloys |
| Author(s) |
Christopher H. Zenk, Connor E Slone, Katelun Wertz, Michael J Mills |
| On-Site Speaker (Planned) |
Christopher H. Zenk |
| Abstract Scope |
Equiatomic Co-Ni-Cr has been shown to exhibit significant strengthening behavior at room temperature and below. Microstructure refinement through microtwinning with hcp-phase formation has been proposed as the dominant strengthening mechanism, enabled by the extremely low stacking fault energy and hcp phase stability at lower temperatures. The aim of the present work is to explore if this mechanism can be combined with gamma prime precipitate strengthening. Solutionized Co-Ni-Cr-Al-W alloys with varying Co/Ni ratios were deformed in interrupted compressive tests. Interestingly, the yield strength continuously increases by 70 percent toward the Ni-rich section of the alloying space, even though no ordered precipitates are present. Some of the alloys show a distinct strengthening behavior reminiscent of the aforementioned equiatomic alloy or TRIP-steels. After aging, the degree to which the increased strength is retained strongly depends on the Co-content. The source of the enhancement of the strengthening response by pre-deformation will be discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |