About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Advances in Multi-Principal Elements Alloys X: Structures and Modeling
|
Presentation Title |
High Thermal Stability B2 Precipitates in a Ru-containing Multi-principal Element Alloy |
Author(s) |
Carolina Frey, Ravit Silverstein, Tresa Pollock |
On-Site Speaker (Planned) |
Carolina Frey |
Abstract Scope |
Refractory Multi-principal Element Alloys (RMPEAs) present an opportunity for new high temperature alloys that can operate above 1200°C, but mechanical properties are currently limited by the lack of strengthening precipitates that are stable at high temperatures. Two phase microstructures composed of coherent B2 and BCC phases in (Al, Ti, Zr)-containing RMPEAs demonstrate high compressive strengths to 1000ºC but the B2 phase is not stable beyond 1200ºC. This presentation will discuss an equiatomic HfNbTaRuZr RMPEA synthesized by arc melting and annealed in a vacuum furnace between 1300 and 1575ºC. BCC, B2, and HCP phases in annealed materials were identified by both x-ray diffraction and transmission electron microscopy, with all phases stable up to 1575ºC. Refinement of the microstructure was achieved by splat quenching. Hardness measurements are reported for as-cast and splat quenched materials and compared to literature values. CALPHAD predictions are evaluated and implications for high temperature strengthening will be discussed. |
Proceedings Inclusion? |
Planned: TMS Journal: Metallurgical and Materials Transactions |
Keywords |
High-Entropy Alloys, High-Temperature Materials, Mechanical Properties |