Effect of α phase morphology on fatigue crack growth behavior of Ti?5Al?5Mo?5V?1Cr?1Fe alloy |
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| Affiliation: | 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. Advanced Research Center, Central South University, Changsha 410083, China;3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;1. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, China;2. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, China;3. Beijing Key Laboratory of Civil Aircraft Structures and Composite Materials, Beijing Aeronautical Science & Technology Research Institute of COMAC, Beijing, 102211, China;4. The Second Research Institute of Civil Aviation Administration of China (CAAC), Chengdu, 610064, China;5. Institute of Materials, China Academy of Engineering Physics, Mianyang, 621907, China;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;2. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China;1. National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die and Mould, Tianjin University of Technology and Education, Tianjin 300222, PR China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, PR China;1. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;2. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China;3. Department of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, UK;4. Beijing Key Laboratory of Civil Aircraft Structures and Composite Materials, Beijing Aeronautical Science & Technology Research Institute of COMAC, Beijing 102211, China;5. The Second Research Institute of Civil Aviation Administration of China (CAAC), Chengdu 610064, China |
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| Abstract: | Taking a Ti?5Al?5Mo?5V?1Cr?1Fe alloy as exemplary case, the fatigue crack growth sensitivity and fracture features with various tailored α phase morphologies were thoroughly investigated using fatigue crack growth rate (FCGR) test, optical microscopy (OM) and scanning electron microscopy (SEM). The tailored microstructures by heat treatments include the fine and coarse secondary α phase, as well as the widmanstatten and basket weave features. The sample with coarse secondary α phase exhibits better comprehensive properties of good crack propagation resistance (with long Paris regime ranging from 15 to 60 MPa·m1/2), high yield strength (1113 MPa) and ultimate strength (1150 MPa), and good elongation (11.6%). The good crack propagation resistance can be attributed to crack deflection, long secondary crack, and tortuous crack path induced by coarse secondary α phase. |
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| Keywords: | Ti?5Al?5Mo?5V?1Cr?1Fe alloy fatigue crack growth fracture feature |
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