About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Physical Thermo-Mechanical Simulation: Laboratory Advances and In-Situ Diffraction Methods
|
| Presentation Title |
High-temperature deformation behavior of additively manufactured niobium alloys from in-house gas-atomized feedstock |
| Author(s) |
John Reidy, Catherine Ott, Gianna Valentino, Ian McCue |
| On-Site Speaker (Planned) |
Ian McCue |
| Abstract Scope |
Nb-base alloys offer excellent high-temperature properties, but many legacy compositions were sidelined due to poor machinability. Additive manufacturing (AM) provides a pathway to bypass these limitations while simultaneously producing microstructures that enhance performance. In this work, the legacy alloy Cb752 was gas-atomized to produce powder feedstock for LPBF, and a modified powder variant was prepared by tumbling HfC nanoparticles with the base powder. Tensile specimens were fabricated from both powders under optimized laser parameters, alongside arc-melted Cb752 for comparison. The AM specimens exhibited consistently higher strength due to stable subgrain dislocation networks that delay recrystallization and enhance strain hardening. The HfC additions further stabilized these networks, improving post-yield performance at intermediate temperatures, though their contribution diminished after particle coarsening at high temperatures. These findings demonstrate that custom atomization and feedstock modification can unlock new performance in Nb-base alloys and provide a generalizable strategy for advancing refractory alloys through tailored AM processing. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Powder Materials, High-Temperature Materials |