Temporal evolution of non-equilibrium γ' precipitates in a rapidly quenched nickel base superalloy |
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| Affiliation: | 1. Center for Advanced Research and Technology, Department of Materials Science and Engineering, University of North Texas, Denton, TX, USA;2. Carbon Convergence Materials Research Center, Korean Institute of Science and Technology, Korea;3. Air Force Research Laboratory, Dayton, OH, USA;4. CMT Structural and Functional Metals Lab, GE Global Research Center, Niskayuna, NY, USA;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xian 710072, PR China;2. Ningbo Institute of Industrial Technology, Ningbo 315201, PR China;1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China;2. Hunan Dahua New Energy Co., Ltd., Changsha 410600, PR China;3. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, PR China;1. School of Aerospace, Xi''an Jiaotong University, Xi''an 710049, PR China;2. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi''an Jiaotong University, Xi''an 710049, PR China;3. State Key Laboratory for Manufacturing System Engineering, Xi''an Jiaotong University, Xi''an 710049, PR China;4. School of Mechanical Engineering, Xi''an Jiaotong University, Xi''an 710049, PR China;5. School of Mathematics and Statistics, Xi''an Jiaotong University, Xi''an 710049, PR China;1. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan;2. Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan;3. Industrial Technology Research Institute, Tainan 70955, Taiwan;4. Center for Nanotechnology, Materials Science, and Microsystems, National Tsing Hua University, Hsinchum 30013, Taiwan |
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| Abstract: | The temporal evolution of non-equilibrium γ' precipitates in a rapidly quenched and isothermally annealed commercial nickel base superalloy has been investigated by coupling transmission electron microscopy and atom probe tomography. When subjected to rapid quenching from above the γ' solvus temperature, the supersaturated single phase γ matrix appears to undergo compositional phase separation possibly via spinodal decomposition to form solute-rich and solute-depleted regions. The regions that have a depletion in Cr and Co undergo an ordering process resulting in the γ' domains which exhibit a far–from equilibrium composition. Upon isothermal annealing, the γ/γ' interface sharpens and the compositions of both γ and γ' phases approach equilibrium. The influence of a non-classical mechanism of γ' precipitation on the size distribution of precipitates as well as the precipitate and matrix compositions, and its subsequent evolution during isothermal annealing has been discussed. |
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| Keywords: | B Annealing B Order/disorder transformation B Phase transformation D Microstructure F Atom probe F Electron microscopy transmission |
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