期刊
ACS NANO
卷 13, 期 4, 页码 4191-4198出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b09195
关键词
dual-phase; zirconia nanowires; in situ tensile tests; inverse Hall-Petch effect; shear band softening effect
类别
资金
- National Natural Science Foundation of China [51532001, 51741201]
- Fundamental Research Funds for the Central Universities [YWF-18-BJ-Y-56]
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials of Donghua University
Ceramic materials exhibit very high stiffness and extraordinary strength, but they typically suffer from brittleness. Amorphization and size confinement are commonly used to reinforce materials. However, the inverse Hall-Petch effect and the shear-band softening effect usually limit further improvement of their performance under a critical size. With an optimum structure design, we demonstrate that dual-phase zirconia nanowires (DP-ZrO2 NWs) with nanocrystals embedded in an amorphous matrix as a strengthening phase can overcome these problems simultaneously. As a result of this structure, in situ tensile tests demonstrate that the mechanical properties have been enormously improved in a way that does not follow both the inverse Hall-Petch effect and the shear band softening effect. The elastic strain approaches similar to 7%, and the ultimate strength is 3.52 GPa, accompanied by a high toughness of similar to 151 MJ m(-3), making the DP-ZrO2 NW composite the strongest and toughest ZrO2 ever achieved. The findings provide a way to improve the mechanical properties of ceramics in a controllable manner, which may serve as a pervasive approach to be broadly applied to a variety of materials.
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