Deformation of fine-grained alumina by grain boundary sliding accommodated by slip |
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| Affiliation: | 1. Institute of Materials Engineering, Technische Universität, Bergakademie Freiberg, Gustav-Zeuner-Str. 5, 09596 Freiberg, Germany;2. Institute of Materials Science, Technische Universität, Bergakademie Freiberg, Gustav-Zeuner-Str. 5, 09596 Freiberg, Germany;3. Institute of Iron and Steel Technology, Technische Universität, Bergakademie Freiberg, Leipziger Str. 34, 09596 Freiberg, Germany;1. School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Beijing Institute of Aeronautical Materials, Beijing 100095, China;3. School of Materials, University of Manchester, Grosvenor Street, Manchester M1 7HS, UK;4. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004, China;5. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China |
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| Abstract: | Creep data from over 40 different polycrystalline alumina materials are reviewed. Most of these studies have attempted to describe the creep data using models based on diffusional creep. In the present paper, however, it is concluded that the dominant deformation mechanism in creep of fine-grained alumina is grain boundary sliding (GBS) accommodated by slip. The slip accommodation process is related to the sequential steps of dislocation glide and climb. When the accommodation process for GBS is that of dislocation climb, the stress exponent is always 2. In this case, the activation energy for creep is either that for oxygen ion diffusion in the lattice or that for oxygen ion diffusion in the grain boundary. When the accommodation process for GBS is that of solute-drag dislocation glide, the stress exponent is 1. For this case, the activation energy is that for solute diffusion at the dislocation site during glide. |
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