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The grain growth behavior during an AC flash event was examined in 8 mol% yttria-stabilized cubic zirconia (8Y-CSZ) polycrystals. The effects of current/power densities on the grain growth behavior were investigated in 8Y-CSZ samples with different specific surface areas at a constant sample temperature and applied field strength. The grain growth rate of flash-treated 8Y-CSZ was 300 times faster than that of heat-treated 8Y-CSZ at the same sample temperature in the absence of an electric current/field, suggesting that the promoted grain growth cannot be ascribed only to a thermal effect but also to an athermal effect occurring during the AC flash event. Moreover, the grain growth during the flash treatment strongly depends on the applied current/power densities and grain size; in particular, the grain growth showed enhancements with increasing applied current/power densities and for relatively small grain sizes. This result suggests that the grain boundary diffusivity of cations, which are regarded as the rate-controlling species for grain growth, could be accelerated by tuning the current/power densities during the flash event. The grain growth mechanism was characterized using a grain growth exponent (n) value of 4.8 for the flash treatment at high current/power densities and using a conventional value of n = 3 under normal heat treatment conditions. The dependence of the grain growth behavior on the AC current/power density suggests that because the cation diffusivity is accelerated due to the formation of numerous point defects during the AC flash event, the grain growth mechanism might depend on the current/power densities and differ from that of conventional grain growth.

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• In Copyright
  This is the peer reviewed version of the following article: Promoting effects of alternating current and input power on grain growth behavior of cubic ZrO2 polycrystals, which has been published in final form at https://doi.org/10.1111/jace.19679. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

Keyword: flash event, grain growth, current effect

Date published: 2024-01-15

Publisher: Wiley

Journal:

• Journal of the American Ceramic Society (ISSN: 00027820) vol. 107 issue. 5 p. 3600-3610

Funding:

• JST JPMJCR1996
• JSPS 20H02444
• JSPS 22J11973

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4777

First published URL: https://doi.org/10.1111/jace.19679

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Updated at: 2025-01-15 16:31:20 +0900

Published on MDR: 2025-01-15 16:31:20 +0900