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The effect of the flash event on grain growth behavior was examined in 8 mol% yttria-stabilized cubic zirconia (8Y-CSZ) polycrystals under direct and alternating electric fields/currents. Even at the same specimen temperature, the rate of the grain growth is accelerated in the flash event than in the heat treatment without electric field/current (0 V), suggesting that the non-thermal effect caused additionally under the flash event contributes to the acceleration of the grain growth. Although the grain growth behavior can be characterized by the empirical equation (d_t^n –d_0^n = kt) with the same grain growth exponent of n = 3 irrespective of the electric field/current, the activation energy for the grain growth is lowered under the flash event. This suggests that the non-thermal effect caused by the flash event does not affect the mechanism of the grain growth, but would accelerate the rate-controlling process of the grain growth. The non-thermal effects can be further accelerated in fine-grained specimens under the alternating current flash and/or by increasing the input power density. Since the grain growth is rate-controlled by the grain boundary cation diffusivity, the non-thermal effect under the flash event would accelerate the grain boundary cation diffusivities through the formation of excess oxygen vacancies depending on the polarity and the power density.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: grain growth, current effect, flash, zirconia

Date published: 2024-05-22

Publisher: Elsevier BV

Journal:

• Ceramics International (ISSN: 02728842) vol. 50 issue. 19 p. 37322-37331

Funding:

• Japan Society for the Promotion of Science 20H02444
• Japan Society for the Promotion of Science 22J11973
• Japan Science and Technology Agency
• Core Research for Evolutional Science and Technology JPMJCR1996

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4850

First published URL: https://doi.org/10.1016/j.ceramint.2024.05.324

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Updated at: 2024-10-15 13:55:33 +0900

Published on MDR: 2026-05-22 08:27:12 +0900