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

Abstract

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.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [2];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [1];  [4];  [4]; ORCiD logo [4]; ORCiD logo [1]; ORCiD logo [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Rutgers Univ., New Brunswick, NJ (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Univ. of California, Davis, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of the Navy, Office of Naval Research (ONR)
OSTI Identifier:
1603527
Grant/Contract Number:  
AC02-05CH11231; 1728419
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 5; Journal Issue: 9; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

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, and Zhang, Xinghang. Nanoscale stacking fault–assisted room temperature plasticity in flash-sintered TiO2. United States: N. p., 2019. Web. https://doi.org/10.1126/sciadv.aaw5519.
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. Nanoscale stacking fault–assisted room temperature plasticity in flash-sintered TiO2. United States. https://doi.org/10.1126/sciadv.aaw5519
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, and Zhang, Xinghang. Fri . "Nanoscale stacking fault–assisted room temperature plasticity in flash-sintered TiO2". United States. https://doi.org/10.1126/sciadv.aaw5519. https://www.osti.gov/servlets/purl/1603527.
@article{osti_1603527,
title = {Nanoscale stacking fault–assisted room temperature plasticity in flash-sintered TiO2},
author = {Li, Jin and Cho, Jaehun and Ding, Jie and Charalambous, Harry and Xue, Sichuang and Wang, Han and Phuah, Xin Li and Jian, Jie and Wang, Xuejing and Ophus, Colin and Tsakalakos, Thomas and García, R. Edwin and Mukherjee, Amiya K. and Bernstein, Noam and Hellberg, C. Stephen and Wang, Haiyan and Zhang, Xinghang},
abstractNote = {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.},
doi = {10.1126/sciadv.aaw5519},
journal = {Science Advances},
number = 9,
volume = 5,
place = {United States},
year = {2019},
month = {9}
}

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