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

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

doi:10.1126/sciadv.aaw5519

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

Journal Article · Fri Sep 20 00:00:00 EDT 2019 · Science Advances

DOI:https://doi.org/10.1126/sciadv.aaw5519· OSTI ID:1603527

^[1]; Cho, Jaehun ^[1]; Ding, Jie ^[1]; ^[2]; Xue, Sichuang ^[1]; ^[1]; ^[1]; ^[1]; ^[1]; ^[3]; ^[2]; ^[1]; Mukherjee, Amiya K. ^[4]; Bernstein, Noam ^[4]; ^[4]; ^[1]; ^[1]

Purdue Univ., West Lafayette, IN (United States)
Rutgers Univ., New Brunswick, NJ (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Davis, CA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); US Department of the Navy, Office of Naval Research (ONR)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1603527

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 9 Vol. 5; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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