Infrared brazing of TiAl intermetallic using BAg-8 braze alloy |
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| Affiliation: | 1. Department of Materials Science and Engineering, National Dong Hwa University, Hualien 974, Taiwan, ROC;2. Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan, ROC;1. School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China;2. National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China;3. National Engineering Research Center of Powder Metallurgy of Titanium & Rare Metals, Guangdong Institute of Materials and Processing, Guangzhou 510650, China;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China;1. AVIC Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, PR China;2. Aeronautical Key Laboratory for Welding and Joining Technology, Beijing 100024, PR China;1. Welding and Plastic Forming Division, Aero Engine Corporation of China Beijing Institute of Aeronautical Materials, Beijing 100095, China;2. Materials Evaluation Center for Aeronautical and Aeroengine Application, Aero Engine Corporation of China Beijing Institute of Aeronautical Materials, Beijing 100095, China;3. Department of Mechanical Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK |
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| Abstract: | TiAl intermetallic alloy joined by infrared brazing using BAg-8 braze alloy was investigated. The microstructural evolution of the brazed joint, shear strength and reaction kinetics across the joint was comprehensively evaluated. According to the experimental observations, silver would not react with the TiAl substrate, but copper reacted vigorously with the TiAl, forming continuous reaction layer. The consumption of copper from molten braze during infrared brazing resulted in depletion of the copper content from the braze. Therefore, chemical composition of the braze deviated from Ag-Cu eutectic into hypoeutectic with increased brazing time and/or temperature. Both AlCuTi and AlCu2Ti phase were observed at the interface between BAg-8 and TiAl substrate for the specimen brazed at 950°C. By increasing the brazing temperature and time, the growth rate of AlCuTi phase was much faster than that of AlCu2Ti phase. The maximum shear strength achieved 343 MPa for the specimen infrared brazed at 950°C for 60 s. Further increasing the brazing time resulted in excessive growth of brittle AlCuTi reaction layer, which greatly deteriorated the shear strength of the joint. |
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