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The relevance of forced melt flow to grain refinement in pure aluminum under a low-frequency alternating current pulse

Published online by Cambridge University Press:  01 February 2016

Limin Zhang ,
Hainan Liu ,
Ning Li ,
Juan Wang ,
Rong Zhang ,
Hui Xing  and
Kaikai Song
Limin Zhang*
Affiliation:
Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an, Shanxi 710072, People's Republic of China
Hainan Liu
Affiliation:
Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an, Shanxi 710072, People's Republic of China
Ning Li*
Affiliation:
Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an, Shanxi 710072, People's Republic of China
Juan Wang
Affiliation:
Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an, Shanxi 710072, People's Republic of China
Rong Zhang*
Affiliation:
Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an, Shanxi 710072, People's Republic of China
Hui Xing
Affiliation:
Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an, Shanxi 710072, People's Republic of China
Kaikai Song
Affiliation:
Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an, Shanxi 710072, People's Republic of China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

The refinement mechanism of alternating current pulse (ACP) on the solidification macrostructures of pure Al and the characterization of refining efficiency were investigated by embedding the wire mesh in the mold. The experiment results showed that ACP treatment during solidification led to the formation of fine equiaxed grain. There were remarkably differences with respect to the area of fine equiaxed zone inside and outside the tube. Lorentz force, induced melt flow and the rest of intrinsic effects of ACP inside and outside the tube were discussed in the present study. It demonstrated that the forced melt flow could lead to the columnar fragmentation and make the crystal nucleus on the mold wall fall off and drift in the liquid, leading to grain refinement. In addition, Reynolds number was suitable to characterize the refining efficiency of pure Al under ACP.

Keywords

Alcastinggrain size
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 3 , 15 February 2016 , pp. 396 - 404
Copyright
Copyright © Materials Research Society 2016 

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Footnotes

Contributing Editor: Jürgen Eckert

References

REFERENCES

Nakada, M., Shiohara, Y., and Flemings, M.C.: Modification of solidification structures by pulse electric discharging. ISIJ Int. 30, 27 (1990).Google Scholar
Barnak, J.P., Sprecher, A.F., and Conrad, H.: Colony (grain) size reduction in eutectic Pb–Sn castings by electropulsing. Scr. Metall. Mater. 32, 879 (1995).CrossRefGoogle Scholar
Ma, J.H., Li, J., Gao, Y.L., and Zhai, Q.J.: Grain refinement of pure Al with different electric current pulse modes. Mater. Lett. 63, 142 (2009).CrossRefGoogle Scholar
Li, X.B., Lu, F.G., Cui, H.C., and Tang, X.H.: Effect of electric current pulse on flow behaviour of Al melt in parallel electrode process. Mater. Sci. Technol. 29, 226 (2013).Google Scholar
Jiang, Y.B., Tang, G.Y., Guan, L., Wang, S.N., Xu, Z.H., Shek, C., and Zhu, Y.H.: Effect of electropulsing treatment on solid solution behavior of an aged Mg alloy AZ61 strip. J. Mater. Res. 23, 2685 (2008).Google Scholar
Wang, X.L., Dai, W.B., Wang, R., Tian, X.Z., and Zhao, X.: Enhanced phase transformation and variant selection by electric current pulses in a Cu–Zn alloy. J. Mater. Res. 29, 975 (2014).Google Scholar
Rahnama, A. and Qin, R.S.: Electropulse-induced microstructural evolution in a ferritic–pearlitic 0.14% C steel. Scr. Mater. 96, 17 (2015).Google Scholar
Zhou, Y.Z., Qin, R.S., and Xiao, S.H.: Reversing effect of electropulsing on damage of 1045 steel. J. Mater. Res. 15, 1056 (2000).Google Scholar
Osório, W.R., Freitas, E.S., and Garcia, A.: EIS and potentiodynamic polarization studies on immiscible monotectic Al–In alloys. Electrochim. Acta 102, 436 (2013).CrossRefGoogle Scholar
Garcia, L.R., Osório, W.R., and Garcia, A.: The effect of cooling rate on the dendritic spacing and morphology of Ag3Sn intermetallic particles of a SnAg solder alloy. Mater. Des. 32, 3008 (2011).CrossRefGoogle Scholar
Osorio, W.R., Freire, C.M.A., and Garcia, A.: The role of macrostructural morphology and grain size on the corrosion resistance of Zn and Al castings. Mater. Sci. Eng., A 402, 22 (2005).CrossRefGoogle Scholar
Zhang, X.F., Lu, W.J., and Qin, R.S.: Removal of MnS inclusions in molten steel using electropulsing. Scr. Mater. 69, 453 (2013).Google Scholar
Qi, J.G., Wang, J.Z., and He, L.J.: An investigation for structure transformation in electric pulse modified liquid aluminum. Phys. B 406, 846 (2011).Google Scholar
Wang, J.Z., Qi, J.Q., Zhao, Z.F., Guo, H.S., and Zhao, T.: Effects of electric pulse modification on liquid structure of Al–5%Cu alloy. Trans. Nonferrous Met. Soc. China 23, 2792 (2013).Google Scholar
Li, J., Ma, J.H., Gao, Y.L., and Zhai, Q.J.: Research on solidification structure refinement of pure aluminum by electric current pulse with parallel electrodes. Mater. Sci. Eng., A 490, 452 (2008).Google Scholar
Ban, C.Y., Han, Y., Ba, Q.X., and Cui, J.Z.: Influence of pulse electric current on solidification structures of Al–Si alloys. Mater. Sci. Forum 546–549, 723 (2007).Google Scholar
Liao, X.L., Zhai, Q.J., Song, C.J., Chen, W.J., and Gong, Y.Y.: 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 (2007).Google Scholar
Zhu, J., Wang, T., Cao, F., Huang, W.X., Fu, H., and Chen, Z.: Real time observation of equiaxed growth of Sn–Pb alloy under an applied direct current by synchrotron microradiography. Mater. Lett. 89, 137 (2012).Google Scholar
Liao, X.L., Zhai, Q.J., Luo, J., Chen, W.J., and Gong, Y.Y.: Refining mechanism of the electric current pulse on the solidification structure of pure aluminum. Acta Mater. 55, 3103 (2007).Google Scholar
Zhang, L.M., Zhang, R., Chen, W., Wu, Y., and Li, N.: Effect of a novel low-voltage alternating current pulse on solidification structure of Al-7Si-0.52Mg alloy. Adv. Mater. Res. 482, 1431 (2012).CrossRefGoogle Scholar
Gui, M.C., Jia, J., Li, Q.C., and Feng, J.H.: Design and application of the instrument of electrical resistivity measurement for liquid metal. J. Mater. Eng. 7, 29 (1994). (In Chinese).Google Scholar
Räbiger, D., Zhang, Y., Galindo, V., Franke, S., Willers, B., and Eckert, S.: The relevance of melt convection to grain refinement in Al–Si alloys solidified under the impact of electric currents. Acta Mater. 79, 327 (2014).Google Scholar
Li, M.J., Tamura, T., Omura, N., and Miwa, K.: Effects of magnetic field and electric current on the solidification of AZ91D magnesium alloys using an electromagnetic vibration technique. J. Alloys Compd. 487, 187 (2009).Google Scholar
Zhang, L.M., Li, N., Xing, H., Zhang, R., Song, K., Du, L., Yin, P., and Yang, C.: Microstructure evolution of directionally solidified Sn–Bi alloy under different medium-density direct current. J. Cryst. Growth 430, 80 (2015).CrossRefGoogle Scholar
Kaldre, I., Fautrelle, Y., Etay, J., Bojarevics, A., and Buligins, L.: Influence on the macrosegregation of binary metallic alloys by thermoelectromagnetic convection and electromagnetic stirring combination. J. Cryst. Growth 402, 230 (2014).Google Scholar
Liotti, E., Lui, A., Vincent, R., Kumar, S., Guo, Z., Connolley, T., Dolbnya, I.P., Hart, M., Arnberg, L., Mathiesen, R.H., and Grant, P.S.: A synchrotron X-ray radiography study of dendrite fragmentation induced by a pulsed electromagnetic field in an Al–15Cu alloy. Acta Mater. 70, 228 (2014).Google Scholar
Sklyarchuk, V., Plevachuk, Y., Yakymovych, A., Eckert, S., Gerbeth, G., and Eigenfeld, K.: Structure sensitive properties of liquid Al–Si alloys. Int. J. Thermophys. 30, 1400 (2009).Google Scholar
Sun, M.H., Geng, H.R., Bian, X.F., and Liu, Y.: Abnormal changes in aluminum viscosity and its relationship with the microstructure of melts. Acta Metall. Sin. 36, 1135 (2000). (In Chinese).Google Scholar
Li, X., Fautrelle, Y., and Ren, Z.M.: Influence of thermoelectric effects on the solid-liquid interface shape and cellular morphology in the mushy zone during the directional solidification of Al–Cu alloys under a magnetic field. Acta Mater. 55, 3803 (2007).CrossRefGoogle Scholar