Numerical determination of the elastic driving force for directional coarsening in Ni-superalloys |
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| Affiliation: | 1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China;2. Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment, 1037 Luoyu Road 430074, Wuhan, China;3. State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan, China;1. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China;3. AECC Beijing Institute of Aeronautical Materials, Beijing, China;4. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing, China;1. University of Chinese Academy of Sciences, Beijing 100049, China;2. Superalloy Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;1. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China |
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| Abstract: | We have developed a general methodology, in the framework of the finite element method, for locally evaluating the generalized force acting on a material interface which is work-conjugate with the normal displacement of the interface itself. This methodology has been applied to the study of directional coarsening of γ′ precipitates in Ni-superalloys. The flexibility of the proposed method has allowed us to closely model the actual microstructural morphology of the alloys and to account for the effects of applied boundary conditions, lattice misfit, elastic anisotropy and inelastic behavior of the crystals. We have positively compared the indications of our model with available experimental data for a few alloys, and a circumscribed parametric study has lead us to formulate a more general interpretation of the rafting phenomenon, which appears to give a satisfactory explanation for all the available experimental observations. |
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