High temperature deformability of ductile flash-sintered ceramics via in-situ compression

Flash sintering has attracted significant attention as its remarkably rapid densification process at low sintering furnace temperature leads to the retention of fine grains and enhanced dielectric properties. However, high-temperature mechanical behaviors of flash-sintered ceramics remain poorly und...

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Bibliographic Details
Published in:Nature communications 2018-05, Vol.9 (1), p.2063-9, Article 2063
Main Authors: Cho, Jaehun, Li, Qiang, Wang, Han, Fan, Zhe, Li, Jin, Xue, Sichuang, Vikrant, K. S. N., Wang, Haiyan, Holland, Troy B., Mukherjee, Amiya K., García, R. Edwin, Zhang, Xinghang
Format: Article
Language:English
Subjects:
147/135
147/143
639/166/988
639/301/1023/1024
639/301/1023/303
Ceramics
Compression
Compressive strength
Crack initiation
Crack propagation
Deformability
Deformation
Densification
Dielectric properties
Dislocation
Dislocation density
Electrical properties
Formability
Fracture mechanics
High temperature
Humanities and Social Sciences
MATERIALS SCIENCE
Mechanical Engineering
Mechanical Properties
multidisciplinary
Phase transitions
Plastic properties
Plasticity
Resistance sintering
Science
Science & Technology - Other Topics
Science (multidisciplinary)
Sintering furnaces
Temperature effects
Transformation toughening
Yttria-stabilized zirconia
Yttrium oxide
Zirconia
Zirconium dioxide
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Summary:Flash sintering has attracted significant attention as its remarkably rapid densification process at low sintering furnace temperature leads to the retention of fine grains and enhanced dielectric properties. However, high-temperature mechanical behaviors of flash-sintered ceramics remain poorly understood. Here, we present high-temperature (up to 600 °C) in situ compression studies on flash-sintered yttria-stabilized zirconia (YSZ). Below 400 °C, the YSZ exhibits high ultimate compressive strength exceeding 3.5 GPa and high inelastic strain (~8%) due primarily to phase transformation toughening. At higher temperatures, crack nucleation and propagation are significantly retarded, and prominent plasticity arises mainly from dislocation activity. The high dislocation density induced in flash-sintered ceramics may have general implications for improving the plasticity of sintered ceramic materials. Flash sintering allows for rapid ceramic processing, but the mechanical behavior of such ceramics remains poorly understood. Here, the authors compress micropillars of yttria stabilized zirconia to show flash sintering promotes outstanding plasticity.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-018-04333-2