Abstract
High temperature tensile behavior under a DC electric field/current was examined in 8 mol% yttria-stabilized cubic zirconia (8Y-CSZ) polycrystals at the furnace temperature of 1000 °C. For the DC power density higher than the critical value of Wc ≈ 100–200 mW/mm3, flash event similar to that of the powder sintering occurred even in the bulk 8Y-CSZ though the Wc is higher than that of the powders. When below the Wc, the DC current increased the sample temperature due to Joule heating, but did not change the rate of the deformation. When above the Wc, the flash event enhanced the rate of the deformation by several times through the grain boundary sliding mechanism, which is similar to that without the DC electric field/current. The enhanced deformation cannot be explained only by the increment of the sample temperature and is likely to occur by the current-enhanced diffusional processes due to the flash event.
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