Microstructures and mechanical properties of Ti3Al/Ni-based superalloy joints brazed with AuNi filler metal |
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| Affiliation: | 1. Welding and Plastic Forming Division, Beijing Institute of Aeronautical Materials, Beijing 100095, China;2. State Key Laboratory of Advanced Brazing Filler Metals and Technology, Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001, China;3. Department of Material Science and Engineering, Beihang University, Beijing 100191, China;1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;3. Key Lab of Materials Modification (Dalian University of Technology), Ministry of Education, Dalian 116085, China;1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China;2. Key Laboratory for Materials Modification by Laser, Ion and Electron Beam (Dalian University of Technology), Ministry of Education, Dalian 116024, China;3. Harbin Institute of Welding, Mechanical Science Research Institute, Harbin 150028, China |
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| Abstract: | For the purpose of high-temperature service and the weight reduction in aviation engineering applications, the dissimilar joining of Ti3Al-based alloy to Ni-based superalloy (GH536) was conducted using Au-17.5Ni (wt%) brazing filler metal. The microstructure and chemical composition at the interfaces were investigated by scanning electron microscope, X-ray diffraction and transmission electron microscope. The diffusion behaviors of elements were analyzed as well. The results indicated that the Ti3Al/GH536 joint microstructure was characterized by multiple layer structures. Element Ni from Au-Ni filler metal reacted with Ti3Al base metal, leading to the formation of AlNi2Ti and NiTi compounds. Element Ni from Ti3Al base metal reacted with Ni and thus Ni3Nb phase was detected in the joint central area. Due to the dissolution of Ni-based superalloy, (Ni,Au) solid solution ((Ni,Au)ss) and Ni-rich phase were visible adjacent to the superalloy side. The average tensile strength of all the joints brazed at 1253 K for 5–20 min was above 356 MPa at room-temperature. In particular, the joints brazed at 1253 K/15 min presented the maximum tensile strength of 434 MPa at room-temperature, and the strength of 314 MPa was maintained at 923 K. AlNi2Ti compound resulted in the highest hardness area and the fracture of the samples subjected to the tensile test mainly occurred in this zone. |
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| Keywords: | Ni-based superalloy Brazing Microstructure Tensile strength |
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