Irradiation effects on Amosic-3 silicon carbide composites by Si ions implantation |
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| Affiliation: | 1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;2. Nuclear Power Institute of China, State Key Laboratory for Nuclear Fuel and Materials, Chengdu, Sichuan 610213, PR China;3. School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China;2. State Key Laboratory of Nuclear Physics and Technology, Department of Technical Physics, Peking University, Beijing 100871, China;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. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China;2. School of Energy and Environment, City University of Hong Kong, Hong Kong, China;1. Institute of Advanced Energy, Kyoto University, Kyoto, Japan;2. Graduate School of Energy Science, Kyoto University, Kyoto, Japan;3. Japan Atomic Energy Agency, Aomori, Japan |
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| Abstract: | SiCf/SiC composites were irradiated to over 100 dpa with 300 keV Si ions at 300 ℃. Here, electron microscopy and Raman spectroscopy were utilized to study the microstructural evolution. The Raman spectra of fiber and matrix showed that the crystal structure was seriously damaged. TEM images revealed that the fiber underwent grain nucleation and growth in lower fluence region, accompanied by an amorphous layer near the damage peak area. Also, the matrix went through recrystallization, and the columnar grains turned into equiaxial ones. Moreover, stacking faults and massive amorphous islands were observed in high resolution TEM images. Following irradiation at 300 ℃, the matrix swelled, but the fiber and interphase shrunken along the axis. And, more remarkably, the hardness of fiber and matrix decreased to different extents, a result that was explained by the generation of amorphous islands and breakdown of covalent bonds, and recrystallization might be responsible for this. |
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| Keywords: | Ion irradiation Microstructure Micromechanical properties |
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