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Microstructure evolution and mechanical properties of brazing joint for ultra-thin-walled Inconel 718 considering grain size effect and brazing temperature
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作者 Rui ZHAO Yueshuai SONG +1 位作者 Hui KANG Min WAN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第2期541-556,共16页
The systematic investigation of the mechanical properties and microstructure evolution process of ultra-thin-walled Inconel 718 capillary brazing joints is of great significance because of the exceptionally high deman... The systematic investigation of the mechanical properties and microstructure evolution process of ultra-thin-walled Inconel 718 capillary brazing joints is of great significance because of the exceptionally high demands on its application.To achieve this objective,this study investigates the impact of three distinct brazing temperatures and five typical grain sizes on the brazed joints’mechanical properties and microstructure evolution process.Microstructural evolution analysis was conducted based on Electron Back Scatter Diffraction(EBSD),Scanning Electron Microscopy(SEM),X-Ray Diffraction(XRD),High-Resolution Transmission Electron Microscopy(HRTEM),and Focused Ion Beam(FIB).Besides,the mechanical properties and fracture behavior were studied based on the uniaxial tension tests and in-situ tension tests.The findings reveal that the brazing joint’s strength is higher for the fine-grain capillary than the coarse-grain one,primarily due to the formation of a dense branch structure composed of G-phase in the brazing seam.The effects of grain size,such as pinning and splitting,are amplified at higher brazing temperatures.Additionally,micro-cracks initiate around brittle intermetallic compounds and propagate through the eutectic zone,leading to a cleavage fracture mode.The fracture stress of fine-grain specimens is higher than that of coarse-grain due to the complex micro-crack path.Therefore,this study contributes significantly to the literature by highlighting the crucial impact of grain size on the brazing properties of ultra-thin-walled Inconel 718 structures. 展开更多
关键词 EYWORDS Ultra-thin-walled structure brazing Inconel 718 Grain size effect brazing temperature
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Joint Strength with Soldering of Al_2O_3 Ceramics After Ni-P Chemical Plating 被引量:4
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作者 邹贵生 吴爱萍 +6 位作者 张德库 孟繁明 白海林 张永清 黎义 巫世杰 顾兆旃 《Tsinghua Science and Technology》 SCIE EI CAS 2004年第5期607-611,共5页
Ni-P alloy was chemically plated on Al2O3 ceramics to produce uniform alloy coatings at tem- peratures below 70℃. Cu metal was electroplated onto the Ni-P coating to facilitate the soldering and shorten the chemica... Ni-P alloy was chemically plated on Al2O3 ceramics to produce uniform alloy coatings at tem- peratures below 70℃. Cu metal was electroplated onto the Ni-P coating to facilitate the soldering and shorten the chemical plating time. Then, the electroplated ceramic specimens were soldered with 60 wt.% Sn-40 wt.% Pb solder in active colophony. The highest shear strength was acquired after the heat treatment at 170℃ for 15 min. The joint fractures mostly propagated along the interface between the ceramics and the Ni-P coating, with some fracture in both the ceramics and the Ni-P coating near the interface and some along the interface between the Cu and Ni-P coatings. The results show that ceramic surface roughness and the chemical plating parameters influence the coating quality, and that suitable heat treatment before the soldering also improves the adhesion between the ceramics and Ni-P coatings, thus strengthening the joints. 展开更多
关键词 CERAMICS chemical plating brazing at low temperature joint fracture
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