Plasticity of nanocrystalline yttria-stabilized tetragonalzirconia polycrystals |
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| Affiliation: | 1. Engineering Physics Department, Polytechnique Montréal, Montréal, QC, Canada H3C 3A7;2. Materials Science Department, Institut de recherche d’Hydro-Québec (IREQ), Varennes, QC, Canada, J3X 1S1;1. College of Mechanical Engineering, Donghua University, Shanghai 201620, China;2. Engineering Research Center of Advanced Textile Machinery, Ministry of Education, Shanghai 201620, China;1. Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China;2. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;3. Shagang School of Iron and Steel, Soochow University, 178 Gan Jiang Dong Road, Suzhou, China;1. State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China;2. School of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan 430073, China;1. Department of Chemical and Materials Engineering, Pontifical Catholic University of Rio de Janeiro, CP 38008, 22453-900, Rio de Janeiro, RJ, Brazil;2. US Army Research Laboratory, 21005, Aberdeen Proving Graund, MD, USA;3. Department of Physics, Federal University of Pará, 66.075-110, Belém, Pará, Brazil |
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| Abstract: | The high-temperature behavior of nanocrystalline yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) with an initial grain size of 120 nm has been studied in uniaxial compression as a function of stress (5–200 MPa) and temperature (1150–1250 °C). The creep parameters, n=2 and Q=630 kJ/mol, were obtained for all experimental conditions. Evaluation of the strain rates showed that the material was more creep resistant than expected for very fine-grained materials. An interface-controlled mechanism is proposed to account for the experimental results. |
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