| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Discontinuous Precipitation Reaction Front of Cellular Recrystallization for a Single-Crystal Superalloy Studied by Electron Microscopy |
| ZHUO Long-Chao1,2**, LIANG Shu-Hua1, WANG Feng2, LIU Yu-Feng3, XIONG Ji-Chun4 |
1School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048
2National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Laboratory of Advanced Materials, Tsinghua University, Beijing 100084
3State Key Lab of Power Systems, Department of Thermal Engineering, Tsinghua University, Beijing 100084
4Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095
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| Cite this article: |
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ZHUO Long-Chao, LIANG Shu-Hua, WANG Feng et al 2015 Chin. Phys. Lett. 32 076102 |
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Abstract Combining analytical transmission electron microscopy systematic tilting, scanning transmission electron microscopy mapping and nano-beam electron diffraction operations, we obtain direct experimental proofs on the boundary type, elemental distribution and structure of the cellular recrystallization reaction front for a single-crystal superalloy. It is demonstrated that the cellular recrystallization reaction front usually corresponds to coincidence site lattice boundaries, and a thin layer of γ-forming elements such as Re, Cr, Mo and Co invariably exists in the direct reaction front. Furthermore, the thin layer with γ-forming elements is proved to be γ phase, with the same orientation as the neighboring original matrix.
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Received: 27 January 2015
Published: 30 July 2015
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| PACS: |
61.82.Bg
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(Metals and alloys)
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81.10.Jt
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(Growth from solid phases (including multiphase diffusion and recrystallization))
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92.10.Ns
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(Fine structure and microstructure in oceanography)
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