| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
J-102: Crystallographic and Compositional Evolution during Isothermal Annealing of Refractory High Entropy Alloys: Insights into High Temperature Phase Stability |
| Author(s) |
Sriswaroop Dasari, Abhishek Sharma, Rajarshi Banerjee, Vishal Soni |
| On-Site Speaker (Planned) |
Vishal Soni |
| Abstract Scope |
The microstructure similar to Ni-base superalloys can be achieved in refractory high entropy alloys (RHEAs) containing Al, albeit with a combination of BCC and B2 phases. Since the ordered B2 phase is based on BCC parent matrix, distinguishing these two phases can be rather challenging. Additionally, there is a tendency for transformation of ordered B2 phase into more complex ordered-omega type phases that are usually deleterious to mechanical properties. Three types of ordered omega phases can form from a parent B2 phase and these transformations were studied using candidate RHEAs, Al0.5Mo0.5NbTa0.5TiZr, Al0.5NbTa0.8Ti1.5V0.2Zr and AlNb1.5Ta0.5Ti3Zr4 alloys. The results from advanced microscopy techniques including correlative TEM-APT show that a metastable two-phase BCC+B2 microstructure formed in early stages of decomposition later transforms into a three-phase BCC+B2+ordered omega microstructure. The effect of such transformation on mechanical properties will also be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, |