Hostname: page-component-78c5997874-g7gxr Total loading time: 0 Render date: 2024-11-10T11:22:15.716Z Has data issue: false hasContentIssue false
  • English
  • Français

Influence of Sr additions on microstructure and properties of Al–Si–Ge–Zn filler metal for brazing 6061 aluminum alloy

Published online by Cambridge University Press:  13 December 2016

Zhiwei Niu ,
Jihua Huang ,
Shuhai Chen  and
Xingke Zhao
Zhiwei Niu
Affiliation:
Laboratory of Materials Welding and Joining (LMWJ), School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
Jihua Huang*
Affiliation:
Laboratory of Materials Welding and Joining (LMWJ), School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
Shuhai Chen
Affiliation:
Laboratory of Materials Welding and Joining (LMWJ), School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
Xingke Zhao
Affiliation:
Laboratory of Materials Welding and Joining (LMWJ), School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: hjihua62@sina.com
Get access

Abstract

The effects of alkaline earth strontium (Sr) additions on the microstructure and properties of Al–Si–Ge–Zn alloys and brazed joints were investigated. The results showed that the appropriate addition of Sr changed the morphology of β-GeSi phases from coarse needle-like to fine granular shapes effectively. Sr addition prevented the growth of Si by Sr adsorbing on the Si surface and caused the formation of many twins in Si. Sr addition had little impact on the melting temperature of the filler metals, but the spreading areas of Al–Si–Ge–Zn–xSr filler metals increased firstly and then decreased with the increase of Sr addition. In addition, the Sr addition optimized the microstructure of the brazed joints and improved the mechanical properties. Sound joints with high shear strength up to 152.4 ± 2.5 MPa could be obtained by applying Al–9.5Si–10Ge–15Zn–0.7Sr (all in wt%) filler metal.

Keywords

Al–Si–Ge–Zn filler metalmicrostructureshear strength6061 aluminum alloy
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 4 , 28 February 2017 , pp. 822 - 830
Check for updates
Copyright
Copyright © Materials Research Society 2016 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

Contributing Editor: Jürgen Eckert

References

REFERENCES

Wang, N., Zhou, Z.M., and Lu, G.M.: Microstructural evolution of 6061 alloy during isothermal heat treatment. J. Mater. Sci. Technol. 27, 8–14 (2011).CrossRefGoogle Scholar
Vargas, J.A., Torres, J.E., Pacheco, J.A., and Hernandez, R.J.: Analysis of heat input effect on the mechanical properties of Al-6061-T6 alloy weld joints. Mater. Des. 52, 556–564 (2013).CrossRefGoogle Scholar
Yadav, D.P., Kaul, R., Ganesh, P., Shiroman, R., Sridhar, R., and Kukreja, L.M.: Study on vacuum brazing of high purity alumina for application in proton synchrotron. Mater. Des. 64, 415–422 (2014).CrossRefGoogle Scholar
Sun, J., Lee, D., Lee, C., Hong, J., and Shin, S.: A novel Zr–Ti–Ni–Cu eutectic system with low melting temperature for the brazing of titanium alloys near 800 °C. J. Mater. Res. 25, 296–302 (2010).CrossRefGoogle Scholar
Kim, J.Y., Hardy, J.S., and Weil, K.S.: Use of aluminum in air-brazing aluminum oxide. J. Mater. Res. 19, 1717–1722 (2004).CrossRefGoogle Scholar
Hosch, T. and Napolitano, R.E.: The effect of the flake to fiber transition in silicon morphology on the tensile properties of Al–Si eutectic alloys. Mater. Sci. Eng., A 528, 226–232 (2010).CrossRefGoogle Scholar
Luo, W., Wang, L.T., Wang, Q.M., Gong, H.L., and Yan, M.: A new filler metal with low contents of Cu for high strength aluminum alloy brazed joints. Mater. Des. 63, 263–269 (2014).CrossRefGoogle Scholar
Humpston, G., Sangha, S.P.S., and Jacobson, D.M.: New filler metals and process for fluxless brazing of aluminium engineering alloys. Mater. Sci. Technol. 11, 1161–1168 (1995).CrossRefGoogle Scholar
Chang, S.Y., Tsao, L.C., Li, T.Y., and Chuang, T.H.: Joining 6061 aluminum alloy with Al–Si–Cu filler metals. J. Alloys Compd. 488, 174–180 (2009).CrossRefGoogle Scholar
Tsao, L.C., Tsai, T.C., Wu, C.S., and Chuang, T.H.: Brazeability of the 6061-T6 aluminum alloy with Al–Si–20Cu–based filler metals. J. Mater. Eng. Perform. 10, 705–709 (2001).CrossRefGoogle Scholar
Kayamoto, T., Kim, J.H., Saito, S., and Onzawa, T.: Brazing of Al–Mg alloy and Al–Mg–Si alloy with Al–Ge based filler metals. Q. J. Jpn. Weld. Soc. 12, 495–501 (1994).CrossRefGoogle Scholar
Suzuki, K., Kagayama, M., and Takeuchi, Y.: Eutectic phase equilbrium of Al–Si–Zn system and its applicability for lower temperature brazing. Light Met. 43, 533–538 (1993).CrossRefGoogle Scholar
Dargusch, M.S., Zhu, S.M., Nie, J.F., and Dunlop, G.L.: Microstructural analysis of the improved creep resistance of a die-cast magnesium–aluminium–rare earth alloy by strontium additions. Scr. Mater. 60, 116–119 (2009).CrossRefGoogle Scholar
Zhang, G.W., Bao, Y.F., Jiang, Y.F., and Zhu, H.: Microstructure and mechanical properties of 6063 aluminum alloy brazed joints with Al–Si–Cu–Ni–RE filler metal. J. Mater. Eng. Perform. 20, 1451–1456 (2011).CrossRefGoogle Scholar
Shin, S., Kim, E., Yeom, G., and Lee, J.: Modification effect of Sr on the microstructures and mechanical properties of Al–10.5Si–2.0Cu recycled alloy for die casting. Mater. Sci. Eng., A 532, 151–157 (2012).CrossRefGoogle Scholar
McDonald, S.D., Nogita, K., and Dahle, A.K.: Eutectic nucleation in Al–Si alloys. Acta Mater. 52, 4273–4280 (2004).CrossRefGoogle Scholar
Niu, Z.W., Huang, J.H., Yang, H., Chen, S.H., and Zhao, X.K.: Preparation and properties of a novel Al–Si–Ge–Zn filler metal for brazing aluminum. J. Mater. Eng. Perform. 24, 2327–2334 (2015).CrossRefGoogle Scholar
Niu, Z.W., Huang, J.H., Liu, K.K., Xu, F.Z., Chen, S.H., and Zhao, X.K.: Brazing of 6061 aluminum alloy with the novel Al–Si–Ge–Zn filler metal. Mater. Lett. 179, 47–51 (2016).CrossRefGoogle Scholar
Hogan, L.M., Kobayashi, K.F., and Shamsuzzoha, M.: Discussion of “the mechanism of silicon modification in aluminum–silicon alloys: Impurity-induced twinning”. Metall. Trans. A 20, 1286–1288 (1989).CrossRefGoogle Scholar
Zhang, Q.Y., Liu, S.Q., and Fan, X.H.: The modification of Si phase in Al–Si eutectic alloys-effect of element addition on microstructures of Al–Si and Al–Si–Ge eutectic alloys. Acta Metall. Sin. 18, 581–585 (1982).Google Scholar
De Cristofaro, N. and Bose, D.: Brazing and soldering with rapidly solidified filler metals. Proc. Conf. Rapidly Solidified Materials, Vol. 415–424, San Diego, CA, 1986.Google Scholar
Chuang, T.H., Tsao, L.C., Tsai, T.C., Yeh, M.S., and Wu, C.S.: Development of a low-melting-point filler metal for brazing aluminum alloys. Metall. Mater. Trans. A 31, 2239–2245 (2000).CrossRefGoogle Scholar
Jacobson, D.M., Humpston, G., and Sangha, S.P.S.: A new low-melting-point aluminum braze. Weld. J. 75, 243–250 (1996).Google Scholar
Shi, Y.W., Yu, Y., Li, Y.P., Xia, Z.D., Lei, Y.P., Li, X.Y., and Guo, F.: Study on the microstructure and wettability of an Al–Cu–Si braze containing small amounts of rare earth erbium. J. Mater. Eng. Perform. 18, 278–281 (2009).CrossRefGoogle Scholar
Bokstein, B., Ivanov, V., Oreshina, O., Peteline, A., and Peteline, S.: Direct experimental observation of accelerated Zn diffusion along triple junctions in Al. Mater. Sci. Eng., A 302, 151–153 (2001).CrossRefGoogle Scholar