| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2023
|
| Presentation Title |
Ultimate: Affordable, Durable Precipitation Strengthened Refractory High Entropy Alloys for Use at 1300 Celsius and Above |
| Author(s) |
Michael C Gao, Michael Kirka, Michael Widom, Chantal Sudbrack , Vishnu Raghuraman, Saro San, Saket Thapliyal, Chris Ledford, Julio Ortega Rojas, Brian Jordon, Paul Jablonksi, David E. Alman |
| On-Site Speaker (Planned) |
David E. Alman |
| Abstract Scope |
In this U.S. Department of Energy ARPA-e Ultimate Program funded project, high throughput CALPHAD, targeted atomic level simulations, and rapid validation experiments were used to design an additive manufacturable, precipitation strengthened refractory high entropy alloy (RHEA) for use at temperatures exceeding 1300 Celsius. High throughput CALPHAD was used to identify alloy systems where carbides form during solid state necessary for the precipitation of fine carbides needed for elevated strength. Intrinsic ductility calculations and ab-initio tensile tests simulations were utilized to identify alloys that also possessed the requisite ductility and toughness. Arc melted buttons (250 gram) were produced from promising compositions for validation of the computational simulations, microstructure and mechanical property evaluation, and single pass beam experiments to simulate direct energy deposition (DED) additive manufacturing (AM) and to assess manufacturability. Reported are the results of DED-AM trials, microstructure assessment, and mechanical performance of down-selected compositions. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
High-Temperature Materials, High-Entropy Alloys, Additive Manufacturing |