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Title: Revealing the ductility of nanoceramic MgAl2O4

Abstract

Ceramics are strong but brittle. As stated in classical theories, ceramics are brittle mainly because dislocations are suppressed by cracks. Here, the authors report the combined elastic and plastic deformation measurements of nanoceramics, in which dislocation-mediated stiff and ductile behaviors were detected at room temperature. In the synchrotron-based deformation experiments, a marked slope change is observed in the stress–strain relationship of MgAl2O4 nanoceramics at high pressures, indicating that a deformation mechanism shift occurs in the compression and that the nanoceramics sample is elastically stiffer than its bulk counterpart. The bulk-sized MgAl2O4 shows no texturing at pressures up to 37 GPa, which is compatible with the brittle behaviors of ceramics. Interestingly, substantial texturing is seen in nanoceramic MgAl2O4 at pressures above 4 GPa. The observed stiffening and texturing indicate that dislocation-mediated mechanisms, usually suppressed in bulk-sized ceramics at low temperature, become operative in nanoceramics. This makes nanoceramics stiff and ductile.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [3];  [4];  [4];  [5];  [4];  [4]
  1. Center for High Pressure Science & Technology Advanced Research, Shanghai (China)
  2. Sichuan Univ., Chengdu (China)
  3. Univ. of California, Berkeley, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
National Natural Science Foundation of China (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
OSTI Identifier:
1532493
Alternate Identifier(s):
OSTI ID: 1572009
Grant/Contract Number:  
AC02-76SF00515; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Research
Additional Journal Information:
Journal Volume: 34; Journal Issue: 9; Journal ID: ISSN 0884-2914
Publisher:
Materials Research Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Chen, Bin, Huang, Yuanjie, Xu, Jianing, Zhou, Xiaoling, Chen, Zhiqiang, Zhang, Hengzhong, Zhang, Jie, Qi, Jianqi, Lu, Tiecheng, Banfield, Jillian F., Yan, Jinyuan, Raju, Selva Vennila, Gleason, Arianna E., Clark, Simon, and MacDowell, Alastair A. Revealing the ductility of nanoceramic MgAl2O4. United States: N. p., 2019. Web. doi:10.1557/jmr.2019.114.
Chen, Bin, Huang, Yuanjie, Xu, Jianing, Zhou, Xiaoling, Chen, Zhiqiang, Zhang, Hengzhong, Zhang, Jie, Qi, Jianqi, Lu, Tiecheng, Banfield, Jillian F., Yan, Jinyuan, Raju, Selva Vennila, Gleason, Arianna E., Clark, Simon, & MacDowell, Alastair A. Revealing the ductility of nanoceramic MgAl2O4. United States. doi:10.1557/jmr.2019.114.
Chen, Bin, Huang, Yuanjie, Xu, Jianing, Zhou, Xiaoling, Chen, Zhiqiang, Zhang, Hengzhong, Zhang, Jie, Qi, Jianqi, Lu, Tiecheng, Banfield, Jillian F., Yan, Jinyuan, Raju, Selva Vennila, Gleason, Arianna E., Clark, Simon, and MacDowell, Alastair A. Tue . "Revealing the ductility of nanoceramic MgAl2O4". United States. doi:10.1557/jmr.2019.114. https://www.osti.gov/servlets/purl/1532493.
@article{osti_1532493,
title = {Revealing the ductility of nanoceramic MgAl2O4},
author = {Chen, Bin and Huang, Yuanjie and Xu, Jianing and Zhou, Xiaoling and Chen, Zhiqiang and Zhang, Hengzhong and Zhang, Jie and Qi, Jianqi and Lu, Tiecheng and Banfield, Jillian F. and Yan, Jinyuan and Raju, Selva Vennila and Gleason, Arianna E. and Clark, Simon and MacDowell, Alastair A.},
abstractNote = {Ceramics are strong but brittle. As stated in classical theories, ceramics are brittle mainly because dislocations are suppressed by cracks. Here, the authors report the combined elastic and plastic deformation measurements of nanoceramics, in which dislocation-mediated stiff and ductile behaviors were detected at room temperature. In the synchrotron-based deformation experiments, a marked slope change is observed in the stress–strain relationship of MgAl2O4 nanoceramics at high pressures, indicating that a deformation mechanism shift occurs in the compression and that the nanoceramics sample is elastically stiffer than its bulk counterpart. The bulk-sized MgAl2O4 shows no texturing at pressures up to 37 GPa, which is compatible with the brittle behaviors of ceramics. Interestingly, substantial texturing is seen in nanoceramic MgAl2O4 at pressures above 4 GPa. The observed stiffening and texturing indicate that dislocation-mediated mechanisms, usually suppressed in bulk-sized ceramics at low temperature, become operative in nanoceramics. This makes nanoceramics stiff and ductile.},
doi = {10.1557/jmr.2019.114},
journal = {Journal of Materials Research},
number = 9,
volume = 34,
place = {United States},
year = {2019},
month = {5}
}

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