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 sam- ple 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 Pois- son’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.
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