| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2024
|
| Presentation Title |
Assessment of Microstructural and Compositional Evolution and Stability in the Ta-(Nb,Mo,W)-V System |
| Author(s) |
Alexander Baker, Connor Rietema, Jibril Shittu, Benjamin Ellyson, Brandon Bocklund, Aurelien Perron, Joseph McKeown |
| On-Site Speaker (Planned) |
Alexander Baker |
| Abstract Scope |
With growing interest in multicomponent refractory alloys for extreme environments - including high temperature turbine blades or first wall fusion reactors - there is a pressing need for comprehensive understanding of foundational binary and ternary alloy systems. Modeling techniques that enable rapid multicomponent alloy candidate down selection like CALPHAD and machine learning necessitate high confidence phase fraction and compositional data of the simpler subsystems. Here, we present detailed analysis of phase diagrams based on Ta-V with additions of Nb, Mo, W. Samples are synthesized by arc melting and annealed in the temperature range 1000 – 1800 C, then characterized using XRD, SEM, and DSC. Laves phase formation (C14, C15, C36) is identified, and the phase boundaries show some deviation from recent literature predictions. Pitfalls including the importance of high temperature homogenization, control of cooling rates, and tolerance to impurities will also be discussed.
Prepared by LLNL under Contract DE-AC52-07NA27344. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, Modeling and Simulation |