| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Entropy Alloys IX: Alloy Development and Properties
|
| Presentation Title |
Intermediate Temperature Precipitation in the HfNbTaTiZr Multi-principal Element Alloy |
| Author(s) |
Megan Emigh, Noah R Phillips, Leah H Mills, Sean P Murray, Tresa M Pollock |
| On-Site Speaker (Planned) |
Megan Emigh |
| Abstract Scope |
HfNbTaTiZr is a refractory multi-principal element alloy that exhibits high strength combined with good ductility at room temperature. In this investigation, the microstructure and mechanical properties under tensile load are investigated at select temperatures. At 800°C, the HfNbTaTiZr alloy exhibited significantly decreased ductility relative to room temperature behavior. The low 800˚C ductility was associated with intergranular fracture and grain boundary precipitation. At a testing temperature of 1200°C, HfNbTaTiZr exhibited high ductility enhanced by dynamic recrystallization. The reduction in cross sectional area at room temperature, 800˚C, and 1200˚C were 48%, 5%, and 62% respectively. Complementary thermodynamic calculations predict two BCC phases and an HCP phase to be stable between 703-804°C. These experimental and computational results underscore a need to understand the high temperature phase equilibria of refractory MPEs so that their microstructure and mechanical properties can be better controlled across the temperature ranges of interest. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, |