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Real time TEM observation of alumina ceramic nano-particles during compression |
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| Authors: | Emilie Calvié Lucile Joly-Pottuz Claude Esnouf Philippe Clément Vincent Garnier Jérôme Chevalier Yves Jorand Annie Malchère Thierry Epicier Karine Masenelli-Varlot |
| Affiliation: | 1. National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen Ceramic Institute, Jingdezhen 333000, China;2. Department of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333000, China;1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, Shaanxi Province, PR China;2. School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, PR China;3. Department of Applied Physics, School of Science, Xi’an Jiaotong University, Xi’an 710049, Shaanxi Province, PR China;1. School of Materials Sciences and Engineering, Shanghai Institute of Technology, Shanghai 201418, China;2. Chemical Engineering College, East China University of Science and Technology, Shanghai 200237, China |
| Abstract: | The behavior of alumina nano-particles taken from a commercial powder is investigated during in situ compression experiments in a transmission electron microscope (TEM). Small particles of 40 nm in diameter can undergo severe plastic deformation without failure, whereas brittle fracture is observed for 120 nm sized nano-particles. This is evidence of a critical size under which alumina, at least in the form of nano-particles, cannot be considered as brittle materials even at room temperature and a direct observation of the grinding limit generally observed during ball milling. |
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