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Discontinuous Precipitation Reaction Front of Cellular Recrystallization for a Single-Crystal Superalloy Studied by Electron Microscopy

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【Author】 ZHUO Long-Chao;LIANG Shu-Hua;WANG Feng;LIU Yu-Feng;XIONG Ji-Chun;School of Materials Science and Engineering,Xi’an University of Technology;National 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;State Key Lab of Power Systems,Department of Thermal Engineering,Tsinghua University;Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials;

【机构】 School of Materials Science and Engineering,Xi’an University of Technology； National 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； State Key Lab of Power Systems,Department of Thermal Engineering,Tsinghua University； Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials；

【摘要】 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 singlecrystal 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.更多还原

【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 singlecrystal 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.更多还原

【基金】 Supported by the Scientific Research Foundation of Xi’an University of Technology under Grant No 101-451115007;the National Natural Science Foundation of China under Grant No 51174161;the Pivot Innovation Team of Shaanxi Electric Materials and Infiltration Technique under Grant No 2012KCT-25

【文献出处】 Chinese Physics Letters ,中国物理快报(英文版) , 编辑部邮箱 ,2015年07期

【分类号】TN16
【下载频次】27

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