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High temperature superplastic creep and internal friction of yttria doped zirconia polycrystals
Affiliation:1. Départment de Physique, Institut de Génie Atomique Ecole Polytechnique Fédérale de Lausanne, Ecublens, CH-1015 Lausanne, Switzerland;2. Département des Matériaux, Laboratoire de Céramique, Ecole Polytechnique Fédérale de Lausanne, Ecublens, CH-1015 Lausanne, Switzerland;1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;2. Temasek Laboratories, Nanyang Technological University, 637553, Singapore;3. School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore;1. School of Engineering, Damghan University, Damghan, Iran;2. Department of Civil Engineering, School of Engineering, University of Birmingham, Birmingham, UK;3. Mechanical Engineering Department, Faculty of Engineering, Lorestan University, Khorramabad, Iran;4. Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia;5. Malaysia – Japan International Institute of Technology (MJIIT), University Teknologi Malaysia Kuala Lumpur, Jalan Sultan Yahya Petra (Jalan Semarak), 54100 Kuala Lumpur, Malaysia;1. Department of Materials Science and Engineering, Virginia Tech, 445 Old Turner Street, Blacksburg, VA, 24061, USA;2. Neutron Scattering Division, Oak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, TN, 37830, USA
Abstract:Creep tests in compression and internal friction experiments have been performed in order to investigate the influences of microstructural parameters such as the grain size and the amount of intergranular glassy phase on the plastic deformation of yttria stabilized tetragonal zirconia polycrystals. The values of the apparent activation energies obtained from creep tests in the low stress regime and those obtained from the internal friction tests are in good agreement. The two techniques appear to be complementary approaches to the study of plastic deformation of fine grained zirconia under low stress. The mechanisms of plastic deformation are discussed in terms of grain boundary sliding models.
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