Creep and Superplasticity of Gadolinium-Doped Ceria Ceramics under AC Electric Current

Apurv Dash*, Koji Morita, Luca Balice, Robert Mücke, Olivier Guillon

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

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 200 mA mm−2 is used for the creep 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 the furnace temperature.

Original languageEnglish
Article number2300057
JournalAdvanced Engineering Materials
Volume25
Issue number18
Number of pages7
ISSN1527-2648
DOIs
Publication statusPublished - 2023

Keywords

  • Creep
  • Electric current
  • Grain boundary sliding
  • Plastic deformation
  • Ceria ceramics
  • Electro plasticity

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