|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Powder and Ceramic Materials Science
||Influence of Microstructure on Mechanical Properties in High Entropy Oxides
||Justin Cortez, Alexander Dupuy, Hasti Vahidi, Olivia Donaldson, Tim Rupert, William Bowman, Julie M. Schoenung
|On-Site Speaker (Planned)
High Entropy Oxide (HEO) materials consist of five or more oxide components in equimolar amounts, which form a single-phase state after processing. These materials exhibit interesting functional properties and hold promise in electronic, optical, and thermal applications. However, little work has been done exploring the mechanical behavior of HEOs, the understanding of which is critical for implementation into practical applications. Here we investigate the role of microstructure on mechanical properties in (CoCuMgNiZn)O. Utilizing planetary ball milling and spark plasma sintering, we are able to produce fully dense single-phase HEO ceramics with grain sizes ranging from 70 nm to 1.4 µm. The mechanical properties of these samples were explored using various indentation methods. A clear Hall-Petch relationship was observed at larger grain sizes, which transitions to an inverse Hall-Petch relationship at nanocrystalline grain sizes. The deformation mechanisms contributing to the Hall-Petch and fracture toughness behavior will be discussed.
||Ceramics, Mechanical Properties, Powder Materials