Electric Current Dependence on Superplastic Tensile Flow in Tetragonal Zirconia Polycrystal Under a DC Field

23 Pages Posted: 18 Jun 2020

See all articles by Yamato Sasaki

Yamato Sasaki

Tokyo University of Science - Department of Materials Science and Technology

Koji Morita

National Institute for Materials Science

Takahisa Yamamoto

Nagoya University - Materials Design Innovation Engineering

Kohei Soga

Tokyo University of Science - Department of Materials Science and Technology

Hiroshi Masuda

National Institute for Materials Science

Hidehiro Yoshida

University of Tokyo - Department of Materials Science & Engineering

Abstract

Electric DC current dependence on the superplastic flow in densified, fine-grained tetragonal ZrO2 polycrystal was systematically investigated. An optimal current density for large tensile ductility existed; the maximum elongation of 135% was achieved under the current density of 250 mA∙mm-2 at a furnace temperature of 1000 ºC and an initial strain rate of 1×10-3 s-1. Application of DC current decreased the flow stress, while that simultaneously accelerated the grain growth in tetragonal ZrO2 polycrystal. The reduced flow stress and improved ductility can be explained not only by Joule heating but also by enhanced atomic diffusion or accelerated grain boundary sliding.

Keywords: Superplasticity, Electric current, Diffusion, Ceramics, Grain boundary

Suggested Citation

Sasaki, Yamato and Morita, Koji and Yamamoto, Takahisa and Soga, Kohei and Masuda, Hiroshi and Yoshida, Hidehiro, Electric Current Dependence on Superplastic Tensile Flow in Tetragonal Zirconia Polycrystal Under a DC Field. Available at SSRN: https://ssrn.com/abstract=3622581 or http://dx.doi.org/10.2139/ssrn.3622581

Yamato Sasaki (Contact Author)

Tokyo University of Science - Department of Materials Science and Technology ( email )

Tokyo
Japan

Koji Morita

National Institute for Materials Science

Tsukuba, Ibaraki 305-0047
Japan

Takahisa Yamamoto

Nagoya University - Materials Design Innovation Engineering

Japan

Kohei Soga

Tokyo University of Science - Department of Materials Science and Technology

Tokyo
Japan

Hiroshi Masuda

National Institute for Materials Science ( email )

Tsukuba, Ibaraki 305-0047
Japan

Hidehiro Yoshida

University of Tokyo - Department of Materials Science & Engineering ( email )

Tokyo
Japan

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