| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Accelerated Discovery and Insertion of Next Generation Structural Materials
|
| Presentation Title |
Navigating the BCC-B2 Refractory Alloy Space: Stability and Thermal Processing with Ru-B2 Precipitates |
| Author(s) |
Sebastian A. Kube, Carolina Frey, Chiyo McMullin, Ben Neuman, Kaitlyn M. Mullin, Tresa M. Pollock |
| On-Site Speaker (Planned) |
Sebastian A. Kube |
| Abstract Scope |
Refractory Multi Principal Element Alloys (RMPEAs) could provide next-generation high-temperature alloys, but especially their combination of ductility and high-temperature strength remains insufficient. Emulating superalloy γ-γ’ microstructures, RMPEAs combining a ductile BCC matrix with embedded B2 precipitates for strengthening could meet this goal. Using high-throughput CALPHAD, we screen across 3,500 potential BCC-B2 systems. The highest stabilities are predicted for alloys combining Ru-based B2s with refractory BCC elements. We rapidly synthesize and characterize the microstructures of 18 such alloys after various heat treatments. Many of these alloys exhibit large B2 fractions stable beyond 1300°C and allow thermal processing via a dissolution-precipitation pathway. While RuTi alloys offer robust stability and processability, RuAl is prone to forming competing phases. The RuHf B2 is exceptionally stable beyond 1900°C but difficult to solutionize. The mechanical properties of the RuTi-based alloys are studied at room temperature and 1200°C. Altogether, these alloys offer great design flexibility and surpass the stability and processability of previous BCC-B2 RMPEAs. |
| Proceedings Inclusion? |
Planned: |