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.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
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)
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)
T. Dursun, C. Soutis, Recent developments in advanced aircraft aluminium alloys. Mater. Des. 56, 862–871 (2014)
H. Ye, An overview of the development of Al–Si–alloy based material for engine applications. J. Mater. Eng. Perform. 12, 288–297 (2003)
K. Kobayashi, L. Hogan, The crystal growth of silicon in Al–Si alloys. J. Mater. Sci. 20, 1961–1975 (1985)
O. Atasoy, F. Yilmaz, R. Elliott, Growth structures in aluminium-silicon alloys I. The coupled zone. J Cryst Growth 66, 137–146 (1984)
S. Lu, A. Hellawell, Growth mechanisms of silicon in Al–Si alloys. J. Cryst. Growth 73, 316–328 (1985)
S.D. McDonald, K. Nogita, A.K. Dahle, Eutectic nucleation in Al–Si alloys. Acta Mater. 52, 4273–4280 (2004)
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)
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)
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)
M. Nakada, Y. Shiohara, M.C. Flemings, Modification of solidification structures by pulse electric discharging. ISIJ Int. 30, 27–33 (1990)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
F. Yilmaz, Structure and properties of directionally solidified Al–Si hypereutectic alloys. Mater. Sci. Eng., A 124, L1–L5 (1990)
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).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Zhang, Y., Xu, Z., Zhong, H., Xiangru, C., Song, C., Zhai, Q. (2018). Microstructure Evolution in Solidified Al–Si Hypereutectic Alloys Under the Impact of an Electric Current Pulse. In: Han, Y. (eds) Advances in Materials Processing. CMC 2017. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-0107-0_117
Download citation
DOI: https://doi.org/10.1007/978-981-13-0107-0_117
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-13-0106-3
Online ISBN: 978-981-13-0107-0
eBook Packages: EngineeringEngineering (R0)