Abstract
Al-6.5Si-42Zn and Al-6.5Si-42Zn-0.09Sr filler metals were used for brazing 6061 aluminum alloy. Air cooling and water cooling were applied after brazing. Si phase morphologies in the brazing alloy and the brazed joints were investigated. It was found that zinc in the Al-Si filler metals could reduce the formation of eutectic Al-Si phase and lower the brazing temperature at about 520°C. Adding 0.09wt% Sr element into the Al-6.5Si-42Zn alloy caused α-Al phase refinement and transformed acicular Si phase into the finely fiber-like. After water cooling, Zn element dissolved into the Al-Si eutectic area, and η-Zn phase disappeared in the brazed joints. Tensile strength testing results showed that the Sr-modified filler metal could enhance the strength of the brazed joints by 13% than Al-12Si, while water-cooling further improved the strength at 144 MPa.
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References
D.M. Jacobson, G. Humpston, and S.P.S. Sangha, A new low-melting-point aluminum braze, Weld. J., 75(1996), p. 243.
Y.W. Shi, Y. Yu, Y.P. Li, Z.D. Xia, Y.P. Lei, X.Y. Li, and F. Guo, Study on the Microstructure and wettability of an Al-Cu-Si braze containing small amounts of rare earth erbium, J. Mater. Eng. Perform., 18(2008), No. 3, p. 278.
S.Y. Chang, L.C. Tsao, T.Y. Li, and T.H. Chuang, Joining 6061 aluminum alloy with Al-Si-Cu filler metals, J. Alloys Compd., 488(2009), No. 1, p. 174.
L.C. Tsao, M.J. Chiang, W.H. Lin, M.D. Cheng, and T.H. Chuang, Effects of zinc additions on the microstructure and melting temperatures of Al-Si-Cu filler metals, Mater. Charact., 48(2002), No. 4, p. 341.
C.Y. Li, X.T. Wang, and W.X. Yuan, Properties of Ag-Au-Ge medium temperature solder. J. Univ. Sci. Technol. Beijing, 30(2008), No. 12, p. 1402.
Z. Wang, Y. Lu, P. Lin, and S. Jian, Effects of Cu, Si, Ni and rare earth elements on melting temperature and properties of Al-Si filler metals, China Weld., 18(2009), No. 4, p. 43.
C.J. Hanga, C.Q. Wang, M. Mayer, Y.H. Tian, Y. Zhou, and H.H. Wang, Growth behavior of Cu/Al intermetallic compounds and cracks in copper ball bonds during isothermal aging, Microelectron. Reliab., 48(2008), No. 3, p. 416.
T. Kayamoto, J.H. Kim, S. Saito, and T. Onzawa, Brazing of Al-Mg alloy and Al-Mg-Si alloy with Al-Ge filler metal, Q. J. Jpn. Weld. Soc., 12(1994), No. 4, p. 495.
W.C. Moshier, J.S. Ahearn, and D.C. Cooke, Interaction of Al-Si, Al-Ge, and Zn-Al eutectic alloys with SiC/Al discontinuously reinforced metal matrix composites, J. Mater. Sci., 22(1987), No. 1, p. 115.
S.Y. Chang, L.C. Tsao, Y.H. Lei, S.M. Mao, and C.H. Huang, Brazing of 6061 aluminum alloy/Ti-6Al-4V using Al-Si-Cu-Ge filler metals, J. Mater. Process. Technol., 212(2012), No. 1, p. 8.
S.H. Wang, H.P. Zhou, and Y.P. Kang, The influence of rare earth elements on microstructure and properties of 6061 aluminum alloy vacuum brazed joints, J. Alloys Compd., 352(2003), No. 1–2, p.79.
S.B. Xue, L. Zhang, Z.J. Han, and X. Huang, Reaction mechanism between oxide film on surface of Al-Li alloy and CsF-AlF3 flux, Trans. Nonferrous Met. Soc. China, 18(2008), No. 1, p. 121.
W. Dai, S.B. Xue, J.Y. Lou, Y.B. Lou, and S.Q. Wang, Torch brazing 3003 aluminum alloy with Zn-Al filler metal. Trans. Nonferrous Met. Soc. China, 22(2012), No. 1, p. 30.
H.C. Liao and G.X. Sun, Mutual poisoning effect between Sr and B in Al-Si casting alloys, Scripta Mater., 48(2003), No. 8, p.1035.
H. Sathyapal and K.N. Prabhu, Modification of eutectic silicon in Al-Si alloys, J. Mater. Sci., 43(2008), No. 9, p. 3009.
W. Dai, S.B. Xue, J.Y. Lou, and S.Q. Wang, Development of Al-Si-Zn-Sr filler metals for brazing 6061 aluminum alloy, Mater. Des., 42(2012), p. 395.
H.R. Lashgari, M. Emamy, A. Razaghian, and A.A. Najimi, The effect of strontium on the microstructure, porosity and tensile properties of A356-10%B4C cast composite, Mater. Sci. Eng. A, 517(2009), No. 1–2, p. 170.
X.Q. Zeng, Y.X. Wang, W.J. Ding, A.A. Luo, and A.K. Sachdev, Effect of strontium on the microstructure, mechanical properties, and fracture behavior of AZ31 magnesium alloy, Metall. Mater. Trans. A, 37(2006), No. 4, p. 1333.
S.F. Liu, L.Y. Liu, and L.G. Kang, Refinement role of electromagnetic stirring and strontium in AZ91 magnesium alloy, J. Alloys Compd., 450(2008), No. 1–2, p.546.
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Dai, W., Xue, Sb., Ji, F. et al. Brazing 6061 aluminum alloy with Al-Si-Zn filler metals containing Sr. Int J Miner Metall Mater 20, 365–370 (2013). https://doi.org/10.1007/s12613-013-0736-1
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DOI: https://doi.org/10.1007/s12613-013-0736-1