About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys V: Mechanical Behavior
|
| Presentation Title |
Effect of Mo-addition on fracture behavior and mechanical properties of NbTaTiV-based refractory high-entropy alloys |
| Author(s) |
Ayeman Mazdi Nahin, Jacob Pustelnik, Jessica Dong, Tamanna Zakia, Michael Lau, Mingwei Zhang |
| On-Site Speaker (Planned) |
Ayeman Mazdi Nahin |
| Abstract Scope |
Designing refractory high-entropy alloys (RHEAs) with high-temperature strength and room-temperature tensile ductility has been a longstanding challenge for researchers. The current state of research in this field is encountering two conflicting issues: RHEAs with only group IV and V elements exhibit extensive tensile ductility but a lack of high-temperature strength; whereas alloying with Group VI elements for strength rapidly deteriorates ductility. Our investigation targets the fundamental mechanisms underlying Group VI-induced embrittlement, including reduced screw dislocation mobility, enhanced dendritic segregation, and increased grain boundary phase segregation with Group IV-VI mixtures. Several NbTaTiVMo-based RHEAs with varying Mo contents were designed by CALPHAD for BCC phase stability. The strength and ductility of these alloys were tested in the as-cast and homogenized states. Our study probes the strength–ductility tradeoff and enables the optimization of the Group IV–VI ratio to design RHEAs with a balanced combination of high-temperature strength and room-temperature tensile ductility. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Mechanical Properties |