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Revealing the ductility of nanoceramic MgAl2O4

Published online by Cambridge University Press:  15 May 2019

Bin Chen*
Affiliation:
Center for High Pressure Science & Technology Advanced Research, Pudong, Shanghai 201203, China
Yuanjie Huang
Affiliation:
Center for High Pressure Science & Technology Advanced Research, Pudong, Shanghai 201203, China
Jianing Xu
Affiliation:
Center for High Pressure Science & Technology Advanced Research, Pudong, Shanghai 201203, China
Xiaoling Zhou
Affiliation:
Center for High Pressure Science & Technology Advanced Research, Pudong, Shanghai 201203, China
Zhiqiang Chen*
Affiliation:
Center for High Pressure Science & Technology Advanced Research, Pudong, Shanghai 201203, China
Hengzhong Zhang
Affiliation:
Center for High Pressure Science & Technology Advanced Research, Pudong, Shanghai 201203, China
Jie Zhang
Affiliation:
Department of Physics, Sichuan University, Chengdu, Sichuan 610064, China
Jianqi Qi
Affiliation:
Department of Physics, Sichuan University, Chengdu, Sichuan 610064, China
Tiecheng Lu
Affiliation:
Department of Physics, Sichuan University, Chengdu, Sichuan 610064, China
Jillian F. Banfield
Affiliation:
Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA
Jinyuan Yan
Affiliation:
Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, California 94720, USA
Selva Vennila Raju
Affiliation:
Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, California 94720, USA
Arianna E. Gleason
Affiliation:
Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, California 94720, USA
Simon Clark
Affiliation:
Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, California 94720, USA
Alastair A. MacDowell
Affiliation:
Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, California 94720, USA
*
a)Address all correspondence to this author. e-mail: chenbin@hpstar.ac.cn
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Abstract

Ceramics are strong but brittle. According to the 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. Surprisingly, 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.

Type
Invited Paper
Copyright
Copyright © Materials Research Society 2019 

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Footnotes

b)

Present address: SLAC National Accelerator Laboratory, Menlo Park, CA 94,305, USA.

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