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Grain boundary sliding mechanism in plastic deformation of nano-grained YAG transparent ceramics: Generalized self-consistent model and nanoindentation experimental validation |
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| Affiliation: | 1. College of Aeronautics and Astronautics, Sichuan University, Chengdu 610064, China;2. Université Paris Ouest Nanterre La Défense, 50 Rue de Sèvres, 92410 Ville d’Avray, France;3. School of Mechanical Engineering, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405, USA;4. School of Mechanical Engineering, Chengdu University, Chengdu 610106, China;1. School of Mechatronic Engineering, XI''AN Technological University, China;2. School of Materials Science and Chemical Engineering, XI''AN Technological University, China;1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China;2. State Key Laboratory of Military Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi’an, 710032, China;3. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China |
| Abstract: | The elastic-plastic deformation behaviors of nano-grained and coarse-grained yttrium aluminum garnet (YAG) transparent ceramics are investigated using nanoindentation. An inverse Hall-Petch relation is observed for the nano-grained YAG ceramic and a forward Hall-Petch relation is observed for the coarse-grained YAG ceramic. In addition, the plastic work ratio as a function of applied load for the nano-grained YAG ceramic shows a different trend than that for the coarse-grained YAG ceramic. These observations suggest that the plastic deformation of the nano-grained YAG ceramic cannot be attributed to the normal dislocation mechanism and is controlled by grain boundary sliding. A generalized self-consistent model for studying the mechanical behavior of the nano-grained YAG ceramic is developed and validated by experimental results. The stress-strain relationship predicted by this model is embedded in finite element simulations which confirmed that the plastic deformation of the nano-grained YAG ceramic indeed can be attributed to grain boundary sliding. |
| Keywords: | Nano-grained YAG ceramic Generalized self-consistent method Nanoindentation Grain boundary sliding Finite element simulation |
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