Abnormal mechanical hysteresis behavior of Tyranno-ZMI SiC/SiC containing Ti3Si(Al)C2 |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;2. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;3. Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, China;1. School of Materials Science and Engineering, Southeast University, Nanjing 211189, PR China;2. Wuxi Lintex Advanced Materials Co., Ltd., Wuxi 214145, PR China;1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan, Shandong, 250061, PR China;2. School of Materials Science and Engineering, Shandong University, Jinan, Shandong, 250061, PR China;1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China;2. School of Integrated Circuit Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China;3. State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;4. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China;2. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;3. Xi’an Xinyao Ceramic Composite Materials Co., Ltd., Xi’an 710117, China |
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| Abstract: | This work studied the effect of tough phase Ti3Si(Al)C2 on the mechanical hysteresis behavior of SiC/SiC. Different from continuous fibers reinforced brittle ceramic matrix composites, the mechanical hysteresis behavior of SiC/SiC containing Ti3Si(Al)C2 shows some abnormal phenomena: as peak applied stress increases during cyclic loading-unloading-reloading tests, the thermal residual stress values exhibit highly dispersion and the thermal misfit relief strain shows abnormally slow growth. These abnormal phenomena are caused by the reduction of transvers cracks (perpendicular to loading fibers) and the generation of hoop cracks (parallel to loading fibers). The plastic deformations of Ti3Si(Al)C2 prevents the transverse cracking of modified matrix, while promoting the hoop cracking of SiC matrix prepared by chemical vapor infiltration (CVI-SiC). Hoop cracking occurs within the transition zone containing amorphous SiO2 layer and carbon layer in CVI-SiC matrix. The combination of weak transition zone and strong modified matrix finally leads to the occurrence of hoop cracking. |
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| Keywords: | Mechanical hysteresis behavior SiC/SiC Thermal residual stress Hoop cracking |
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