About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
Accelerated Design of a Nb-based Refractory Medium-Entropy Alloy Fabricated via Laser Powder Directed Energy Deposition |
| Author(s) |
Yasam Palguna, Jonathan W. Pegues, Nima Shamsaei |
| On-Site Speaker (Planned) |
Jonathan W. Pegues |
| Abstract Scope |
Refractory complex concentrated alloys are promising for high-temperature applications, surpassing the performance boundaries of conventional Ni-based superalloys. Traditional refractory alloys are increasingly impacted by the scarcity of certain alloying elements, heightening market volatility. In this study, the compositional design space of a Nb-based medium-entropy alloy (MEA) was explored with an emphasis on stabilizing costs and increasing high-temperature strength. CALPHAD was employed to identify compositional regions of interest for the development of a phase stable Nb-MEA. Process parameters were screened using single track beads using a Formalloy L5 laser powder directed energy deposition (LP-DED) system. The down-selected process set was then used to fabricate a single-bead wall, which was subsequently sectioned, metallographically analyzed, and subjected to hardness testing to establish foundational process-structure-property relationships. Results are presented in the context of phase stability, spatially dependent microstructure, and their influence on mechanical strength to accelerate experimental validation of development of complex alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, High-Entropy Alloys |