open access publication

Article, 2023

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

Advanced Engineering Materials, ISSN 1527-2648, 1438-1656, Volume 25, 18, 10.1002/adem.202300057

Contributors

Dash, Apurv 0000-0002-4869-3104 (Corresponding author) [1] [2] Morita, Koji 0000-0001-6040-7054 [3] Balice, Luca 0000-0003-3664-6797 [2] Mücke, Robert [2] Guillon, Olivier 0000-0003-4831-5725 [2]

Affiliations

  1. [1] Technical University of Denmark
    2. [NORA names: DTU Technical University of Denmark; University; Denmark; Europe, EU; Nordic; OECD];
  2. [2] Forschungszentrum Jülich
    3. [NORA names: Germany; Europe, EU; OECD];
  3. [3] National Institute for Materials Science
    4. [NORA names: Japan; Asia, East; OECD]

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.

Keywords

AC electric current, Joule, Joule heating effect, TZP, boundary sliding, brittleness, cases, ceramics, ceria, ceria ceramics, creep, creep deformation, creep experiments, creep rate, creep rate increases, current, current density results, deformation, dense ceramics, density, density results, effect, electric current, electric field, enhanced ductility, enhanced grain-boundary sliding, enhanced plasticity, experiments, exponent, field, furnace, furnace temperature, gadolinium-doped ceria, grain, grain boundary sliding, grain boundary sliding mechanism, heating effect, high temperature, higher current density results, increase, inherent brittleness, interaction, layer, load, magnitude, mechanism of plastic deformation, nanograined ceramics, plastic deformation, rate, rate increases, results, shape, slides, space charge layer, steady state creep rate, stress, stress exponent, superplasticity, temperature, tensile, tensile loading, tetragonal zirconia, zirconia

Funders

  • Deutsche Forschungsgemeinschaft

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