Nanoscale stacking fault–assisted room temperature plasticity in flash-sintered TiO 2
| Autor: | C. Stephen Hellberg, Haiyan Wang, Xuejing Wang, Jie Jian, Amiya K. Mukherjee, Harry Charalambous, Jie Ding, Jaehun Cho, Sichuang Xue, R. Edwin García, Xinghang Zhang, Thomas Tsakalakos, Han Wang, Xin Li Phuah, Noam Bernstein, Jin Li, Colin Ophus |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
genetic structures Materials Science Stacking 02 engineering and technology Plasticity 01 natural sciences Brittleness 0103 physical sciences Ceramic Composite material Research Articles 010302 applied physics Multidisciplinary technology industry and agriculture SciAdv r-articles equipment and supplies 021001 nanoscience & nanotechnology visual_art visual_art.visual_art_medium Fracture (geology) Deformation (engineering) Dislocation 0210 nano-technology Research Article Stacking fault |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| Popis: | Flash-sintered ceramics exhibit unexpected room temperature plasticity due to the high density preexisting defects. Ceramic materials have been widely used for structural applications. However, most ceramics have rather limited plasticity at low temperatures and fracture well before the onset of plastic yielding. The brittle nature of ceramics arises from the lack of dislocation activity and the need for high stress to nucleate dislocations. Here, we have investigated the deformability of TiO2 prepared by a flash-sintering technique. Our in situ studies show that the flash-sintered TiO2 can be compressed to ~10% strain under room temperature without noticeable crack formation. The room temperature plasticity in flash-sintered TiO2 is attributed to the formation of nanoscale stacking faults and nanotwins, which may be assisted by the high-density preexisting defects and oxygen vacancies introduced by the flash-sintering process. Distinct deformation behaviors have been observed in flash-sintered TiO2 deformed at different testing temperatures, ranging from room temperature to 600°C. Potential mechanisms that may render ductile ceramic materials are discussed. |
| Databáze: | OpenAIRE |
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