About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
In situ Studies on Microstructural Evolution and Thermally Activated Plasticity of (Co, Cu, Mg, Ni, Zn) O High-Entropy Oxide |
| Author(s) |
Chang Liu, Chao Shen, Jianan Shen, Benson Kunhung Tsai, Yifan Zhang, Yizhi Zhang, Ke Xu, Debargha Paul, Juanjuan Lu, Zedong Hu, Xuanyu Sheng, Yang Chen, Huan Li, Adil Wazeer, Shiyu Zhou, R. Edwin García, Xinghang Zhang, Haiyan Wang |
| On-Site Speaker (Planned) |
Chang Liu |
| Abstract Scope |
High-entropy oxides (HEOs) offer promising structural performance due to their compositional complexity and stable single-phase structures. This study investigates the mechanical behavior of spark plasma sintered (Co, Cu, Mg, Ni, Zn) O using in situ micropillar compression from room temperature to 600 °C inside a scanning electron microscope, supported by microstructure analysis using transmission electron microscopy and crystallographic orientation mapping. At room temperature, brittle transgranular fracture occurs with limited dislocation activity. At 400 °C, shear bands, Cu rich precipitation and delayed cracking emerge. While at 600 °C, obvious plastic deformation involving dislocation glide, slip bands, grain refinement, and precipitation toughening have been observed. Fracture strain rises from 7.7% to 17.2% as compressive strength drops from 3.3 GPa to 1.6 GPa with increasing test temperature. These results reveal temperature-activated plasticity in (Co, Cu, Mg, Ni, Zn) O and demonstrate the potential of entropy-stabilized design in overcoming ceramic brittleness via microstructural engineering. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Characterization, High-Temperature Materials |