| Abstract Scope |
High entropy oxides are being extensively studied for various functional applications. Like most ceramics, high entropy oxides are difficult to fabricate into complex geometries. Superplasticity, where a material deforms without strain localization, provides a potential avenue for efficiently manufacturing materials into net shaped parts. While superplasticity is uncommon in ceramics, it has been previously observed in select materials such as Si3N4 and ZrO2. In the current study, bulk (Co,Cu,Mg,Ni,Zn)O samples were deformed superplastically for the first time. A combination of deformation experiments, finite element analysis, and microstructural characterization confirms that (Co,Cu,Mg,Ni,Zn)O deforms through superplastic deformation. This superplastic deformation has been performed at modest temperatures and pressures and can be used to fabricate net shaped parts. Details of the mechanisms underpinning superplasticity in (Co,Cu,Mg,Ni,Zn)O will be discussed. Superplastic deformation will provide a powerful method of manufacturing high entropy oxides into complex geometries, greatly expanding their potential applications. |