Grain Refinement of Direct Chill Cast 7050 Aluminium Alloy with Low Frequency Electromagnetic Field

Abstract:

Low frequency electromagnetic casting (LFEC) process was used to make 7050 aluminum alloy 162mm ingots and study its effect on the as-cast microstructure. Effects of electromagnetic field parameters such as frequency and current intensity on microstructures were systemically investigated. The results showed that LFEC has a significant grain refining effect on 7050 alloy. The microstructures of LFEC ingot from the border to the center of the cross section are all equiaxed or nearly equiaxed grains which are much finer and more uniform than those of DC cast ingot. It was also found that electromagnetic field frequency and current intensity play important roles on the microstructure refinement. The discussion was mainly focused on the mechanism of grain refinement by LFEC process.

• Periodical: Advanced Materials Research (Volume 402)
• Pages: 850-853
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.402.850
• Online since: November 2011
• Authors: Yu Bo Zuo, Zhi Hao Zhao, Jian Zhong Cui
• Keywords: 7050 Aluminium Alloy, Grain Refinement, Low Frequency Electromagnetic Casting, Macrostructure, Microstructure

References

[1] B. S. Murty, S. A. Kori, M. Chakraborty, Inter. Mater. Rev. 47 (2002) 3-29.

[2] R. Nadella, D. G. Eskin, L. Katgerman, Metall. Mater. Trans. A 39 (2008) 450-461.

[3] D. G. Eskin, Physical metallurgy of direct chill casting of aluminum alloys, CRC Press, Boca Raton 2008.

DOI: 10.1201/9781420062823

[4] Y. N. Kwon, Y. S. Lee, J. H. Lee, Magnesium technology 2009, TMS, San Francisco, California, USA, 2009, pp.425-428.

[5] P. S. Mohanty, J. E. Gruzleski, Acta Metallurgica Et Materialia 43 (1995) 2001-2012.

DOI: 10.1016/0956-7151(94)00405-7

[6] X. Liu, Y. Osawa, S. Takamori, T. Mukai, Mater. Lett. 62 (2008) 2872-2875.

[7] G. I. Eskin, Ultrasonics Sonochemistry 2 (1995) s137-141.

[8] G. I. Eskin, G. S. Makarov, Y. P. Pimenov, Adv. Perform. Mater. 2 (1995) 43-50.

[9] G. I. Eskin, Adv. Perform. Mater. 4 (1997) 223-232.

[10] B. Zhang, J. Cui, G. Lu, Mater. Sci. Eng. A 355 (2003) 325-330.

[11] J. Dong, Z. Zhao, J. Cui, F. Yu, C. Ban, Metall. Mater. Trans. A 35 (2004) 2487-2494.

[12] K. Miwa, T. Tamura, M. Li, et al., Materials Science Forum 690 (2011) 162-165.

[13] Z. N. Getselev, J. Met. 10 (1971) 38-43.

[14] Y. B. Zuo, M. Xia, S. Liang, et al., Mater. Sci. Technol. 27 (2011) 101-107.

[15] Y. B. Zuo, B. Jiang, Z. Fan, Materials Science Forum 690 (2011) 137-140.

[16] M. C. Flemings, Solidification Processing, McGraw-Hill, NY, USA, 1974.

[17] M. C. Flemings, Metall. Trans. A 22 (1991) 957-981.

[18] Y. B. Zuo, H. Nagaumi, J. Z. Cui, J. Mater. Process. Technol. 197 (2008) 109-115.

[19] Y. Zuo, J. Cui, J. Dong, F. Yu, Mater. Sci. Eng. A 408 (2005) 176-181.