Microstructural Characterization and Phase Separation Sequences During Solidification of Ni3Al-Based Superalloy
来源期刊：Acta Metallurgica Sinica2017年第10期
论文作者：Jing Wu Yong-Chang Liu Chong Li Xing-Chuan Xia Yu-Ting Wu Hui-Jun Li Hai-Peng Wang
文章页码：949 - 956
摘 要：As-cast Microstructure of A Designed Polycrystalline Ni3 Al-based Superalloy Is Characterized Using Optical Microscope,scanning Electron Microscope, Transmission Electron Microscope Equipped with Selected Area Diffraction System,and the Intermetallic Phase Transformations Involved During Solidification Process Are Determined Based on Thermal Analysis Measurements. the As-cast Microstructure Is Mainly Composed of 80.63 Vol% Dendritic and 19.37 Vol% Interdendritic Phases,and the Dendrite Is Identified As Quasi-cuboidal γ’i Phase Connected by γ-channels Where Ultrafine γ’Ⅱ Particles Are Distributed,and the Interdendritic Phases Are Determined As γ’-γ Eutectic Structure Consisting of Ye Phase with Dotted Quasi-spherical γ’e Particles. During Solidification, the Dendrite Firstly Nucleates from Liquid Melt Near 1348 ℃; Subsequently, the Residual Liquidoid Is Transformed into Interdendritic Phases Around 1326 ℃. Afterward, γ’ Phase Will Precipitate from Dendritic Ymatrix with Two-stage Characteristics, Resulting in the Distinct Precipitation of γ’Ⅰ and γ’Ⅱ Phases When Approaching to 1190 And 1043 ℃, Respectively. the Corresponding Transformations Involved During the Solidification Process Can Be Translated As:Liquidoid{Dendrite（γD）（80.63）%→γ’Ⅰ+γ（channel）→γ’Ⅰ+γ’Ⅱ+γ（channel） Residual liquidoid（19.37%）→Interdendrite（γ’E-γE eutectic）}As-cast
Jing Wu1，Yong-Chang Liu1，Chong Li1，Xing-Chuan Xia1，Yu-Ting Wu1，Hui-Jun Li1，Hai-Peng Wang2
1. State Key Lab of Hydraulic Engineering Simulation and Safety,School of Materials Science and Engineering,Tianjin University2. Department of Applied Physics,School of Science,Northwestern Polytechnical University
摘 要：As-cast Microstructure of A Designed Polycrystalline Ni3 Al-based Superalloy Is Characterized Using Optical Microscope,scanning Electron Microscope, Transmission Electron Microscope Equipped with Selected Area Diffraction System,and the Intermetallic Phase Transformations Involved During Solidification Process Are Determined Based on Thermal Analysis Measurements. the As-cast Microstructure Is Mainly Composed of 80.63 Vol% Dendritic and 19.37 Vol% Interdendritic Phases,and the Dendrite Is Identified As Quasi-cuboidal γ’i Phase Connected by γ-channels Where Ultrafine γ’Ⅱ Particles Are Distributed,and the Interdendritic Phases Are Determined As γ’-γ Eutectic Structure Consisting of Ye Phase with Dotted Quasi-spherical γ’e Particles. During Solidification, the Dendrite Firstly Nucleates from Liquid Melt Near 1348 ℃; Subsequently, the Residual Liquidoid Is Transformed into Interdendritic Phases Around 1326 ℃. Afterward, γ’ Phase Will Precipitate from Dendritic Ymatrix with Two-stage Characteristics, Resulting in the Distinct Precipitation of γ’Ⅰ and γ’Ⅱ Phases When Approaching to 1190 And 1043 ℃, Respectively. the Corresponding Transformations Involved During the Solidification Process Can Be Translated As:Liquidoid{Dendrite（γD）（80.63）%→γ’Ⅰ+γ（channel）→γ’Ⅰ+γ’Ⅱ+γ（channel） Residual liquidoid（19.37%）→Interdendrite（γ’E-γE eutectic）}As-cast
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