| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond V
|
| Presentation Title |
A Phase-field Study of CuO Precipitate Morphology in Epitaxial High-Entropy Oxide Films |
| Author(s) |
Yueze Tan, Jacob T. Sivak, Saeed S. I. Almishal, Susan B. Sinnott, Jon-Paul Maria, Yanzhou Ji, Long-Qing Chen |
| On-Site Speaker (Planned) |
Yueze Tan |
| Abstract Scope |
Multiple equal-molar cation high-entropy oxides (HEOs) can be entropically stabilized as homogeneous solid solutions at sufficiently high temperatures. At lower temperatures, they are susceptible to formation of both stable and metastable precipitates, the morphology of which would have profound influence on the resulting properties. To investigate the precipitate morphologies, we have extended our recent phase-field model of simultaneous solid solution and stoichiometric phases to multicomponent oxides, applying it to coherent CuO-rich precipitates in epitaxial Mg0.2Co0.2Ni0.2Cu0.2Zn0.2O thin films, with parameters informed by ab-initio calculations and microscopy characterizations. The predicted morphologies and strain distributions show excellent agreement with experiments, and the habit plane orientations can be attributed to minimization of elastic strain energy. We also reveal the important impact of elastic boundary constraints for the precipitate distribution in thin films. Our findings can provide useful insights into manipulating the coherent precipitate morphology in epitaxial HEO thin films. |