Nanoscale stacking fault–assisted room temperature plasticity in flash-sintered TiO2

Jin Li, Jaehun Cho, Jie Ding, Harry Charalambous, Sichuang Xue, Han Wang, Xin Li Phuah, Jie Jian, Xuejing Wang, Colin Ophus, Thomas Tsakalakos, R. Edwin García, Amiya K. Mukherjee, Noam Bernstein, C. Stephen Hellberg, Haiyan Wang, Xinghang Zhang

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64 Scopus citations


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.

Original languageEnglish (US)
Article numbereaaw5519
JournalScience Advances
Issue number9
StatePublished - Sep 20 2019

All Science Journal Classification (ASJC) codes

  • General


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