Superplastic characteristics of high purity yttria-stabilized zirconia polycrystals |
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| Institution: | 1. Institute of Industrial Science, The University of Tokyo, 4-6-1Komaba, Meguro-ku, Tokyo 153-8505, Japan;2. Department of Electronic Systems Engineering, Faculty of Advanced Engineering, Tokyo University of Science, 6-3-1 Nijuku, Katsushika-ku, Tokyo 125-8585, Japan;1. Wright State University, Department of Mechanical and Materials Engineering, Dayton, OH 45435, U.S.A;2. Iowa State University, Departments of Aerospace Engineering and Mechanical Engineering, Ames, Iowa 50011, U.S.A;3. Ames Laboratory, Division of Materials Science and Engineering, Ames, IA, USA;1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland;2. University of Tehran, College of Engineering, School of Mechanical Engineering, North Kargar St, Tehran, Iran |
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| Abstract: | The mechanical characteristics of superplastic yttria-stabilized zirconia polycrystals have been analyzed as a function of stress, temperature and grain size. The evolution of the stress exponent n with stress found in high purity materials is similar to that observed in superplastic metals. True creep parameters can be ascribed to the deformation mechanism at high stresses. By contrast, the creep parameters exhibit a continuous evolution with stress, temperature and grain size at low stresses. The threshold stress formalism used in conventional and high strain rate superplastic metals accounts for the mechanical characteristics observed in fine-grained zirconia polycrystals. |
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