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

Jaehun Cho, Qiang Li, Han Wang, Zhe Fan, Jin Li, Sichuang Xue, K. S. N. Vikrant, Haiyan Wang (), Troy B. Holland, Amiya K. Mukherjee, R. Edwin García and Xinghang Zhang ()
Additional contact information
Jaehun Cho: Purdue University
Qiang Li: Purdue University
Han Wang: Purdue University
Zhe Fan: Oak Ridge National Laboratory
Jin Li: Purdue University
Sichuang Xue: Purdue University
K. S. N. Vikrant: Purdue University
Haiyan Wang: Purdue University
Troy B. Holland: Colorado State University
Amiya K. Mukherjee: University of California
R. Edwin García: Purdue University
Xinghang Zhang: Purdue University

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract 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.

Date: 2018
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DOI: 10.1038/s41467-018-04333-2

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