About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Powder and Ceramic Materials Science
|
Presentation Title |
Mechanical Behavior of Multiphase Entropy Stabilized Oxides |
Author(s) |
Salma A. El-Azab, Luz Gomez, Alexander Dupuy, Julie Schoenung |
On-Site Speaker (Planned) |
Salma A. El-Azab |
Abstract Scope |
Entropy stabilized oxides (ESOs) undergo a reversible phase transformation between a multiphase and a single phase state. (Co,Cu,Mg,Ni,Zn)O transition metal ESOs (TM-ESOs) exhibit a rocksalt phase, plus Cu-rich tenorite and Co-rich spinel secondary phases that form during heat treatment. The role of these secondary phases on the mechanical behavior is not currently understood. The present investigation seeks to harnesses this phase transformation to tailor the mechanical behavior of TM-ESOs. Sintered single-phase samples were heat treated for different time increments to form variable secondary phase concentrations. X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and atomic force microscopy were employed to characterize secondary phase evolution. Room temperature indentation experiments were performed to evaluate the hardness, elastic modulus, and fracture toughness. Because the secondary phases exhibit different mechanical behavior than the TM-ESO rocksalt phase, Cu-deficient and Co-deficient compositions were also analyzed to isolate the influence of individual secondary phases on mechanical behavior. |
Proceedings Inclusion? |
Planned: |
Keywords |
Ceramics, Characterization, Mechanical Properties |