About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
Achieving high creep resistance in a newly designed niobium alloy with grain boundary necklace structure |
| Author(s) |
Supreeth Gaddam, Sebastien Dryepondt, Sam Bell, Zahra Gholami Shiri, K. S. Ravi Chandran |
| On-Site Speaker (Planned) |
Supreeth Gaddam |
| Abstract Scope |
Refractory alloys are promising candidates for very high temperature applications due to their high melting points relative to Ni-base superalloys. In particular, niobium alloys are attractive due to their low density, high strength, and good tensile ductility. This presentation will showcase a new Nb-alloy (Nb-Hf-W-X-Y), designed to have a unique necklace structure along the grain boundaries, resulting in high creep resistance. Two alloys, with a slight variation in composition, were synthesized by spark plasma sintering. The results of vacuum tensile creep testing at 1200°C are presented. The alloy with a well-developed necklace structure showed very low rates of creep strain accumulation at stress levels of 50-200 MPa. The alloy without the necklace structure showed accelerated creep rates and a much lower time to failure. The improved performance of the alloy with the necklace structure is highlighted against historical Nb-alloys in terms of steady state creep rates and Larsen-Miller Parameter calculations. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Powder Materials, Other |