期刊
SCRIPTA MATERIALIA
卷 214, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.114654
关键词
Ceramics; Superplasticity; Electric current; Grain boundary sliding; Dislocation
类别
资金
- National Natural Science Foundation of China [51802271, 51732009, 51672227]
- Department of Science and Technology of Sichuan Province [2021JDJQ0019]
- Fundamental Research Fund for the Central Universities [2682020ZT38]
This study systematically investigated the tensile creep of 3 mol% Y2O3 stabilized tetragonal ZrO2 ceramics under a DC field. The results showed that the deformation mechanism of the material strongly depended on the current density and applied stress. Exceptionally large uniform elongation can be obtained when the creep is dominated by dislocation accommodated grain-boundary sliding.
The tensile creep of 3 mol% Y2O3 stabilized tetragonal ZrO2 ceramics under a DC field was systematically investigated. The results show that the deformation mechanism of the material strongly depends on the current density and the applied stress. Exceptionally large uniform elongation can be obtained only when the creep is dominated by dislocation accommodated grain-boundary sliding. A maximum uniform elongation of similar to 300% is achieved at a strain rate close to 10(-3) s(-1). At an even higher strain rate of about 10(-2) s(-1), uniform elongation is still near 100%. The current results suggest that high strain rate superplasticity can be induced by applying a strong electric field at proper stress and current density.
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