| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Phase Transformations in Entropy Stabilized Oxides Controlled by Defect Chemistry |
| Author(s) |
Jacob Eugene Norman, Alexander Dupuy, Julie Schoenung |
| On-Site Speaker (Planned) |
Jacob Eugene Norman |
| Abstract Scope |
The reversible phase transformations between single-phase and multiphase states in entropy stabilized oxides present an opportunity to control phase heterogeneity. A possible goal is to produce entropy stabilized oxides with highly controlled microstructures and phase states. By using aliovalent dopants to change the defect chemistry, we hypothesize that this is an additional strategy to engineer the phase transformation behavior by promoting the formation of enthalpy-driven phases. We test this hypothesis by synthesizing equimolar (CoCuMgNiZn)O (2+ valence for each cation) doped with mixed- and single-valence binary oxides. Examples include Cr2O3, Fe2O3, Mn3O4, and TiO2. The doped powders are consolidated through conventional sintering to form fully dense, bulk samples. Subsequent heat treatment is used to examine the phase evolution as a function of heat treatment temperature. X-ray diffraction and electron microscopy are used to characterize the influence of dopant and heat treatment on microstructure and phase transformation behavior. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Characterization, Other |