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Shaping of dense ceramics is difficult due to their inherent brittleness. Nanograined ceramics like tetragonal zirconia (TZP) can be superplastically deformed and shaped at high temperatures owing to grain boundary sliding (GBS). Herein, the enhanced plasticity of gadolinium-doped ceria (GDC) ceramics under mild and strong AC electric current in terms of steady state creep rate under both compressive and tensile loading is demonstrated. A current density of 25 and 200mAmm 2isusedforthecreep deformation. The creep rate increases by up to two orders of magnitude under electric current. The stress exponent remains unchanged for creep experiments at 1200 °C with and without electric current, suggesting a GBS mechanism of plastic deformation in both cases. The field-enhanced creep rate is attributed to the interaction of space charge layer and the electric field resulting in enhanced GBS. A higher current density results in enhanced ductility of GDC even when the Joule heating effect is compensated by reducing t

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: creep, current effect, high temperature deformation, ceria

刊行年月日: 2023-08-08

出版者: Wiley

掲載誌:

• Advanced Engineering Materials (ISSN: 15272648) vol. 25 issue. 18 2300057

研究助成金:

• Deutsche Forschungsgemeinschaft GU 933/9-2

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/adem.202300057

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更新時刻: 2024-11-06 16:30:27 +0900

MDRでの公開時刻: 2024-11-06 16:30:27 +0900