About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
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| Presentation Title |
Microstructural evolution and thermally activated plasticity of (Co,Cu,Mg,Ni,Zn)O high-entropy oxides via in situ SEM micropillar compression test |
| 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), typically composed of five or more metal cations, have attracted significant interest as structurally robust ceramics owing to their exceptional compositional complexity and thermally stable single-phase microstructures.In this study, we explore the temperature-dependent mechanical behavior of spark plasma sintered Co0.2Cu0.2Mg0.2Ni0.2Zn0.2O using in situ micropillar compression testing from room temperature up to 600 °C. At room temperature, HEOs display brittle transgranular fracture with limited dislocation activity. At 400 °C, initial signs of plasticity emerge, including grain refinement, dislocation tangling, and the onset of precipitation. At 600 °C, deformation is dominated by dislocation glide, slip band formation, enhanced grain boundary activity, and precipitation toughening. Correspondingly, the fracture strain increases from ~7.7% to ~17.2%, while the compressive strength decreases from ~3.3 GPa to ~1.6 GPa. These results highlight a temperature-induced transition from brittle to ductile behavior and emphasize the potential of entropy-stabilized oxides to overcome the intrinsic brittleness of ceramics through microstructural engineering. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Characterization, High-Temperature Materials |