About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fundamentals of Sustainable Metallurgy and Materials Science
|
| Presentation Title |
Unveiling hydrogen-based direct reduction mechanisms of multicomponent oxides via in situ high-energy x-ray diffraction |
| Author(s) |
Shiv Shankar, Barak Ratzker, Yan Ma, Dierk Raabe |
| On-Site Speaker (Planned) |
Shiv Shankar |
| Abstract Scope |
Co-reduction of multicomponent oxides with hydrogen offers a carbon-neutral approach toward sustainable alloy design. Herein, we use in situ high-energy X-ray diffraction technique to gain insights into multicomponent oxide reduction of two precursor variants: mechanically mixed powders and pre-sintered oxide mixtures, targeting an equiatomic CoFeMnNi alloy. We find distinct reduction pathways and microstructure evolution, depending on initial precursors. Mixed powders are reduced to body-centered-cubic, face-centered-cubic, and MnO phases via halite, spinel, and Mn3O4 intermediates, whereas the pre-sintered complex oxide directly transforms into a mixture of metallic and MnO phases, highlighting the significant role of initial precursors on the final microstructure. Hence, precursor design strategies may offer a single-step route to nanoporous alloys with potential applications in catalysis and energy technologies. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Sustainability, High-Entropy Alloys, Extraction and Processing |