| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Powder Materials Processing and Fundamental Understanding
|
| Presentation Title |
Synthesis and Crystallography of High Entropy Metal Carbides: A New Class of Ultrahigh Temperature Ceramics |
| Author(s) |
Olivia A. Graeve |
| On-Site Speaker (Planned) |
Olivia A. Graeve |
| Abstract Scope |
We have implemented a novel solvothermal synthesis process for the preparation of high entropy metal carbide (HEMC) powders. Specifically, mixtures of Mo-Nb-Ta-V-W carbides were produced by mixing metal chlorides and carbon powder in the presence of molten lithium. We have produced binary, ternary, quaternary, quinary, and senary metal carbides through systematic manipulation of elemental composition. Solid solutions have been confirmed by a combination of X-ray diffraction / Rietveld refinement and energy dispersive spectroscopy. Subsequently, spark plasma sintering (SPS) was used to obtain dense specimens of these compositionally complex ceramics. Phase composition and structure of the sintered specimens, density, and elemental distribution were analyzed. Grain boundary composition was also explored using atomic-resolution transmission electron microscopy. We will also describe preliminary results on the synthesis of hexaboride materials by similar techniques as the HEMC powders and present a comparative analysis between the techniques. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, High-Temperature Materials, Powder Materials |