About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Mechanical Behavior at the Nanoscale VI
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Presentation Title |
Grain Size Dependent Deformation Mechanisms in Complex Concentrated Oxides (Co,Cu,Mg,Ni,Zn)O |
Author(s) |
Xin Wang, Justin Cortez, Alexander D. Dupuy, Julie M. Schoenung, William J. Bowman |
On-Site Speaker (Planned) |
Xin Wang |
Abstract Scope |
As a new class of ceramic materials, complex concentrated oxides (CCOs, often called high-entropy oxides, HEOs) offer entropy-enhanced stability and compositionally tunable properties, which are demanded for various functional and structural applications. In the present study, we explore the effect of grain size on deformation mechanisms in CCOs, an important issue for materials development that remains unresolved. Fully dense bulk samples of polycrystalline single-phase CCO (Co,Cu,Mg,Ni,Zn)O with grain sizes ranging from the nanometer to the micron scale were prepared from solid-state synthesized powders and consolidated using appropriate sintering conditions. The as-sintered CCO samples were mechanically deformed, and the post-deformation microstructures were characterized using transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). We find that the deformation response is significantly different between nano-grain CCO and micron-grain CCO samples, due to changes in the deformation mechanisms, which are observed in the microstructure. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, |