Micromechanical properties and microstructural evolution of Amosic-3 SiC/SiC composites irradiated by silicon ions |
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| Affiliation: | 1. Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha, 410083, China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China;3. Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China;1. DEN-Service de Recherches Métallurgiques Appliquées, CEA, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France;2. Laboratoire Navier, UMR 8205, Ecole des Ponts ParisTech, IFSTTAR, CNRS, Université Paris-Est, F-77455 Marne-la-Vallée, France;3. Synchrotron SOLEIL, St-Aubin 91192, France;1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, PR China |
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| Abstract: | In this work, Amosic-3 SiC/SiC composites were irradiated to 10 dpa and 115 dpa with 300 keV Si ions at 300 °C. To evaluate its irradiation behaviour and investigate the underlying mechanism, nanoindentation, AFM, Raman and electron microscopy were utilized. Nanoindentation showed that although micromechanical properties declined after irradiation, hardness and Young’s modulus were maintained better under 115 dpa. AFM manifested differential swelling among PyC interface, fiber and matrix and SEM showed irradiation-induced partial interface debonding, which are both more obvious under 115 dpa. TEM revealed the generation and proliferation of amorphous regions, which is according with the decline and broadening of peaks in Raman spectra. The material was almost completely amorphous after irradiated to 10 dpa while recrystallization occurred under 115 dpa. All results mentioned above contribute to the decline of hardness and Young’s modulus and may explain why the micromechanical degradation was more significant under 10 dpa. |
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| Keywords: | Silicon carbide SiC/SiC composites Ion irradiation Microstructure Micromechanical properties |
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