About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing of Refractory Metallic Materials
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Presentation Title |
Laser Beam Directed Energy Deposition Fabrication of MoNbTaTi Refractory High Entropy Alloy via Elemental Powder Processing |
Author(s) |
Erin Barrick, Levi Van Bastian, Sarah Birchall, Jonathan Pegues, Andrew Kustas |
On-Site Speaker (Planned) |
Erin Barrick |
Abstract Scope |
Refractory high entropy alloys (RHEAs) are emerging materials that have attracted attention for exceptional properties, such as high melting temperatures, retention of high-strength at elevated temperature, resistance to degradation, etc. There is interest and investment in using additive manufacturing to rapidly screen novel RHEAs via elemental powder printing, but there are unique challenges as compared with pre-alloyed powder, requiring optimization of process parameters. Laser beam directed energy deposition (L-DED) was used to fabricate compact metallurgical specimens of MoNbTaTi using various parameters (laser power, hatch spacing, laser-remelting). Novel metallographic etching techniques were developed to enable observation of individual melt pools to understand the effects of processing on print quality and microstructure; additional characterization was performed with scanning electron microscopy. The resulting print strategies can be adapted to other RHEAs and have important implications for full-scale adaptation of these alloys. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525 |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, High-Entropy Alloys, Characterization |