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Microstructure and Mechanical Properties of 6063 Aluminum Alloy Brazed Joints with Al-Si-Cu-Ni-RE Filler Metal

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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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Acknowledgment

The work was supported by the Director, Office of Science and Technology, of Nanjing Research Institute of Electronics Technology, under Contract No. B1120060474.

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Authors and Affiliations

  1. College of Mechanical and Electronic Engineering, Hohai University, Changzhou, 213022, Jiangsu, China

    Guowei Zhang, Yefeng Bao & Yongfeng Jiang

  2. Nanjing Research Institute of Electronics Technology, Nanjing, 210013, Jiangsu, China

    Hong Zhu

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  1. Guowei Zhang
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  2. Yefeng Bao
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Correspondence to Yefeng Bao.

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Zhang, G., Bao, Y., Jiang, Y. et al. Microstructure and Mechanical Properties of 6063 Aluminum Alloy Brazed Joints with Al-Si-Cu-Ni-RE Filler Metal. J. of Materi Eng and Perform 20, 1451–1456 (2011). https://doi.org/10.1007/s11665-010-9802-2

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  • DOI: https://doi.org/10.1007/s11665-010-9802-2

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