Microstructure and Mechanical Properties of 6063 Aluminum Alloy Brazed Joints with Al-Si-Cu-Ni-RE Filler Metal |
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Authors: | Guowei Zhang Yefeng Bao Yongfeng Jiang Hong Zhu |
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Affiliation: | (1) College of Mechanical and Electronic Engineering, Hohai University, Changzhou, 213022, Jiangsu, China;(2) Nanjing Research Institute of Electronics Technology, Nanjing, 210013, Jiangsu, China |
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Abstract: | A new low melting point filler metal, Al-Si-Cu-Ni-RE, was developed for the furnace brazing of aluminum alloy 6063. Flux-assisted
brazing was conducted at 560 °C using the new filler metal and AlF3-CsF-KF flux. Microstructure of the brazed joints were studied by means of SEM, TEM, and EDS. Shear strength and micro-Vickers
hardness of joints had been tested. Results show that sound joints could be obtained with the filler metal and the flux. Microstructure
characterization of the brazed joint shows dendritic CuAl2 phase was distributed evenly and Si-phase was spheroidized and refined, which was embedded in CuAl2 dendrites with modification of rare-earth element. Shear strength test results show that the joints with Al-Si-Cu-Ni-RE filler
metal achieved average shear strength of 62.5 MPa, 14.5% more than the shear strength of brazed joints with Chinese HL401
filler metal. The micro-Vickers hardness of joint after T6 treatment is about 83 HV. The hardness of the joints after just
brazing and after solution treatment was higher than the hardness of the base metal. |
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