Study of deformation mechanisms in flash-sintered yttria-stabilized zirconia by in-situ micromechanical testing at elevated temperatures

被引：31

作者：

Cho, Jaehun ^{[1
]}

Li, Jin ^{[1
]}

Wang, Han ^{[1
]}

Li, Qiang ^{[1
]}

Fan, Zhe ^{[2
]}

Mukherjee, A. K. ^{[3
]}

Rheinheimer, W. ^{[1
]}

Wang, Haiyan ^{[1
,4
]}

Zhang, X. ^{[1
]}

机构：

[1] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA

[2] Oak Ridge Natl Lab, Oak Ridge, TN USA

[3] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

[4] Purdue Univ, Sch Elect & Comp Engn, W Lafayette, IN 47907 USA

来源：

MATERIALS RESEARCH LETTERS | 2019年 / 7卷 / 05期

关键词：

Flash sintering; deformation mechanism; in-situ microcompression test; dislocation; VACANCY FORMATION ENERGIES; REDUCING GRAIN-BOUNDARY; SHAPE-MEMORY; SOLUTE SEGREGATION; DISLOCATION-MOTION; ACTIVATION-ENERGY; CREEP; DIFFUSION; BEHAVIOR; MICROSTRUCTURE;

D O I：

10.1080/21663831.2019.1575924

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Flash sintering has received wide attention lately due to its ultrafast densification process at low sintering temperature. However, the deformability of flash-sintered ceramics remains poorly understood. Yttria-stabilized zirconia (YSZ) was processed by flash sintering to study deformation mechanism. Transmission electron microscopy studies show that the flash-sintered YSZ contains ultrafine grains and dislocations. Strain rate jump tests at elevated temperature by in-situ microcompression indicate the existence of a large threshold stress. The activation energy of deformation is approximate to 145kJ/mol, similar to the activation energy for oxygen vacancy migration. The deformation mechanisms of the flash-sintered YSZ at elevated temperatures are discussed. [GRAPHICS] . IMPACT STATEMENTThe current study reveals the underlying deformation mechanisms of flash-sintered 3YSZ that shows considerable plasticity over the temperature range of 450-650 degrees C via in-situ microcompression test.

引用

页码：194 / 202

页数：9

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