| About this Abstract |
| Meeting |
3rd World Congress on High Entropy Alloys (HEA 2023)
|
| Symposium
|
HEA 2023
|
| Presentation Title |
Additive Manufacturing as a Processing Pathway for Refractory BCC+B2 Alloys |
| Author(s) |
Kaitlyn M. Mullin, Sebastian Kube, Carolina Frey, Sophia K. Wu, Tresa M. Pollock |
| On-Site Speaker (Planned) |
Kaitlyn M. Mullin |
| Abstract Scope |
Emulating the nickel-base superalloy gamma+gamma-prime microstructure in BCC+B2 refractory multi-principal element alloys (RMPEAs) is a promising alloy design strategy to achieve strength and ductility at high temperatures. Ru-based B2 precipitates have shown exceptional thermal stability and can even persist to melting, making traditional solutioning and aging pathways difficult. Though the rapid solidification velocities inherent to additive manufacturing (AM) may suppress B2 formation upon solidification, these conditions introduce extreme thermal stresses that often lead to microcracking in precipitation-strengthened superalloys. To investigate AM as a possible processing strategy for BCC+B2 RMPEAs, a selection of HfRu and TiRu based BCC+B2 compositions with different solvus temperatures are exposed to laser track experiments. The cracking behavior and solidification morphologies are characterized as a function of composition and process parameters. B2 precipitate morphologies in the melt pools are characterized after subsequent aging treatments. |
| Proceedings Inclusion? |
Planned: Metallurgical and Materials Transactions |