Microstructure Evolution in Solidified Al–Si Hypereutectic Alloys Under the Impact of an Electric Current Pulse

  • Yunhu Zhang
  • ZhiShuai Xu
  • Honggang Zhong
  • Chen Xiangru
  • Changjiang Song
  • Qijie Zhai
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

Investigating the structure evolution of silicon phase in Al–Si alloys in the extra energy field is of high importance to understand and control the growth behavior of faceting phases. The present paper focuses on the influence of an electric current pulse (ECP) on the structure of directionally solidified Al–20.5 wt%Si hypereutectic alloy. Experimental results showed that ECP had a great impact on the structures of silicon phase. The interconnected, porous primary silicon structure was observed in the initial growth period, accompanied by a small quantity of eutectic silicon directly growing from the primary silicon. In the following growth period, it was surprisingly found that the numerous complex regular silicon and eutectic silicon structures appear instead of the primary silicon. On the other hand, the reference sample without ECP showeds that the structures were composed of several coarse plate-like primary silicon and eutectic structures. The variation of silicon structures indicated that the solidification behavior of faceting phases was remarkably modified by ECP, which may be due to the forced melt flow generated by the electromagnetic force.

Keywords

Al–Si alloy Structure evolution Solidification Electric current pulse 

Notes

Acknowledgements

The authors gratefully acknowledge the financial supports from the Shanghai Sailing Program (Grant no. 17YF1405600), National Natural Science Foundation of China (Grant no. 51704192, 51320105003), Science and Technology Commission of Shanghai Municipality (Grant no. 14DZ2261200).

References

  1. 1.
    A. Heinz, A. Haszler, C. Keidel, S. Moldenhauer, R. Benedictus, W. Miller, Recent development in aluminium alloys for aerospace applications. Mater. Sci. Eng., A 280, 102–107 (2000)CrossRefGoogle Scholar
  2. 2.
    W. Miller, L. Zhuang, J. Bottema, A.J. Wittebrood, P. De Smet, A. Haszler, A. Vieregge, Recent development in aluminium alloys for the automotive industry. Mater. Sci. Eng., A 280, 37–49 (2000)CrossRefGoogle Scholar
  3. 3.
    T. Dursun, C. Soutis, Recent developments in advanced aircraft aluminium alloys. Mater. Des. 56, 862–871 (2014)CrossRefGoogle Scholar
  4. 4.
    H. Ye, An overview of the development of Al–Si–alloy based material for engine applications. J. Mater. Eng. Perform. 12, 288–297 (2003)CrossRefGoogle Scholar
  5. 5.
    K. Kobayashi, L. Hogan, The crystal growth of silicon in Al–Si alloys. J. Mater. Sci. 20, 1961–1975 (1985)CrossRefGoogle Scholar
  6. 6.
    O. Atasoy, F. Yilmaz, R. Elliott, Growth structures in aluminium-silicon alloys I. The coupled zone. J Cryst Growth 66, 137–146 (1984)CrossRefGoogle Scholar
  7. 7.
    S. Lu, A. Hellawell, Growth mechanisms of silicon in Al–Si alloys. J. Cryst. Growth 73, 316–328 (1985)CrossRefGoogle Scholar
  8. 8.
    S.D. McDonald, K. Nogita, A.K. Dahle, Eutectic nucleation in Al–Si alloys. Acta Mater. 52, 4273–4280 (2004)CrossRefGoogle Scholar
  9. 9.
    X. Liao, Q. Zhai, J. Luo, W. Chen, Y. Gong, Refining mechanism of the electric current pulse on the solidification structure of pure aluminum. Acta Mater. 55, 3103–3109 (2007)CrossRefGoogle Scholar
  10. 10.
    J. Li, J. Ma, Y. Gao, Q. Zhai, Research on solidification structure refinement of pure aluminum by electric current pulse with parallel electrodes. Mater. Sci. Eng., A 490, 452–456 (2008)CrossRefGoogle Scholar
  11. 11.
    J. Ma, J. Li, Y. Gao, Q. Zhai, Grain refinement of pure Al with different electric current pulse modes. Mater. Lett. 63, 142–144 (2009)CrossRefGoogle Scholar
  12. 12.
    M. Nakada, Y. Shiohara, M.C. Flemings, Modification of solidification structures by pulse electric discharging. ISIJ Int. 30, 27–33 (1990)CrossRefGoogle Scholar
  13. 13.
    H. Ding, Y. Zhang, S. Jiang, R. Chen, Z. Zhao, J. Guo, D. Xu, H. Fu, Influences of pulse electric current treatment on solidification microstructures and mechanical properties of Al–Si piston alloys. China foundry 6, 24–31 (2009)Google Scholar
  14. 14.
    C. Ban, Y. Han, Q. Ba, J. Cui, Influence of pulse electric current on solidification structures of Al–Si alloys. Mater. Sci. Forum 546, 723–728 (2007)CrossRefGoogle Scholar
  15. 15.
    J. Zhu, T. Wang, F. Cao, W. Huang, H. Fu, Z. Chen, Real time observation of equiaxed growth of Sn–Pb alloy under an applied direct current by synchrotron microradiography. Mater. Lett. 89, 137–139 (2012)CrossRefGoogle Scholar
  16. 16.
    T. Wang, J. Xu, T. Xiao, H. Xie, J. Li, T. Li, Z. Cao, Evolution of dendrite morphology of a binary alloy under an applied electric current: an in situ observation. Phys. Rev. E 81, 042601 (2010)CrossRefGoogle Scholar
  17. 17.
    L.N. Brush, R.N. Grugel, The effect of an electric current on rod-eutectic solidification in Sn–0.9 wt.% Cu alloys. Mater. Sci. Eng. A, 238, 176–181 (1997)CrossRefGoogle Scholar
  18. 18.
    X. Liao, Q. Zhai, C. Song, W. Chen, Y. Gong, Effects of electric current pulse on stability of solid/liquid interface of Al–4.5 wt%Cu alloy during directional solidification. Mater. Sci. Eng. A, 466, 56–60 (2007)CrossRefGoogle Scholar
  19. 19.
    C. Song, Y. Guo, Y. Zhang, H. Zheng, M. Yan, Q. Han, Q. Zhai, Effect of currents on the microstructure of directionally solidified Al–4.5 wt%Cu alloy. J. Cryst. Growth 324, 235–242 (2011)CrossRefGoogle Scholar
  20. 20.
    F. Li, L.L. Regel, W.R. Wilcox, The influence of electric current pulses on the microstructure of the MnBi/Bi eutectic. J. Cryst. Growth 223, 251–264 (2001)CrossRefGoogle Scholar
  21. 21.
    X. Feng, Y. Yang, Numerical modeling of crystal growth of a nickel-based superalloy with applied direct current. J. Cryst. Growth 334, 170–176 (2011)CrossRefGoogle Scholar
  22. 22.
    Y. Zhang, C. Song, L. Zhu, H. Zheng, H. Zhong, Q. Han, Q. Zhai, Influence of electric-current pulse treatment on the formation of regular eutectic morphology in an Al–Si eutectic alloy. Metall. Mater. Trans. B 42, 604–611 (2011)CrossRefGoogle Scholar
  23. 23.
    D. Räbiger, Y. Zhang, V. Galindo, S. Franke, B. Willers, S. Eckert, The relevance of melt convection to grain refinement in Al–Si alloys solidified under the impact of electric currents. Acta Mater. 79, 327–338 (2014)CrossRefGoogle Scholar
  24. 24.
    Y. Zhang, X. Miao, Z. Shen, Q. Han, C. Song, Q. Zhai, Macro segregation formation mechanism of the primary silicon phase in directionally solidified Al–Si hypereutectic alloys under the impact of electric currents. Acta Mater. 97, 357–366 (2015)CrossRefGoogle Scholar
  25. 25.
    F. Yilmaz, Structure and properties of directionally solidified Al–Si hypereutectic alloys. Mater. Sci. Eng., A 124, L1–L5 (1990)CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Yunhu Zhang
    • 1
  • ZhiShuai Xu
    • 1
  • Honggang Zhong
    • 1
  • Chen Xiangru
    • 1
  • Changjiang Song
    • 1
  • Qijie Zhai
    • 1
  1. 1.State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and EngineeringShanghai UniversityShanghaiChina

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