Viscous Poisson's ratio, bulk and shear viscosity during electrical field assisted sintering of polycrystalline ceria

Uniaxial viscous Poisson's ratio, bulk and shear viscosities were measured by discontinuous sinter-forging without and with alternating current electric fields under the same conditions, i.e. by keeping the sample temperature constant. This precaution enables the exclusion of any macroscopic Jo...

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Bibliographic Details
Published inScripta materialia Vol. 178; pp. 240 - 243
Main Authors Cao, Chen, Mücke, Robert, Wakai, Fumihiro, Guillon, Olivier
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.03.2020
Subjects
Bulk viscosity
Ceria
Electric field assisted sintering
Shear viscosity
Viscous Poisson's ratio
Viscous Poisson's ratio
Shear viscosity
Electric field assisted sintering
Bulk viscosity
Ceria
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Summary:Uniaxial viscous Poisson's ratio, bulk and shear viscosities were measured by discontinuous sinter-forging without and with alternating current electric fields under the same conditions, i.e. by keeping the sample temperature constant. This precaution enables the exclusion of any macroscopic Joule heating. Major findings are: (i) viscous Poisson's ratio increases with the relative density, with and without electric field; (ii) viscous Poisson's ratio increases with the presence of electrical fields; (iii) changes in the viscous Poisson's ratio can be correlated to a clear decrease in shear viscosity, which can be attributed to an easier grain boundary sliding under electric field. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2019.11.043