The Formation Mechanism of Equiaxed Crystals in Pure Aluminum Solidification Structure under the Al-Ti-C Master Alloy

Abstract:

The influence of different solidified velocities on the structure of pure aluminum during the process of refinement by Al-5Ti-0.6C master alloy was studied and the impact mechanism was discussed. The results show that at the same solidified velocity, with the increase of the amount of Al-5Ti-0.6C master alloy, in the solidified structure of pure aluminum, columnar crystals will gradually decrease, while equiaxed crystals will gradually increase. But in the case when the level of addition is the same, the faster the solidified velocity, the greater the number of equiaxed crystals will be in the ingot microstructure. The formation of equiaxed crystals is the result of the dual role of dissociation of crystal particles and heterogeneous nucleation of “TiC particle---Ti transition zone”.

• Periodical: Advanced Materials Research (Volume 668)
• Pages: 865-869
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.668.865
• Online since: March 2013
• Authors: Wan Wu Ding, Wen Jun Zhao, Tian Dong Xia
• Keywords: Al-Ti-C Master Alloy, Equiaxed Crystals, Formation Mechanism, Solidified Velocity

References

[1] K. Venkateswarlu, M. Chakraborty, B.S. Murty : Mater. Sci. Eng. Vol. A364 (2004), p.75.

[2] V.H. Lopez, A. Scoles, A.R. Kennedy: Mater : Sci. Eng. Vol. A356 (2003), p.316.

[3] Z.Q. Wang, X.F. Liu, J.Y. Zhang, et al.: J. Mater. Sci. Lett. Vol. 22 (2003), p.1427.

[4] L.N. Yu, X.F. Liu : J Mater Process Technol. Vol. 182 (2007), p.519.

[5] N. Iqbal, N.H. van Dijk, S. E. Offerman, et al : Mater. Sci. Eng A. Vol. A416(2006), p.18.

[6] Z.B. Xiao, Y.L. Deng, J.G. Tang, et al.: Trans. Nonferrous Met. Soc. China. Vol. 22(2012), p.371, in Chinese.

[7] A. Cibula: J Inst. Met, Vol. 76( 1949), p.321.

[8] A. Banerji, W. Reif : Metall. Trans. Vol. A 17A(1986) , p.2127.

[9] Y.W. Yan, S.F. Liu, X.M. Fan, et al.: Trans. Nonferrous Met. Soc. China. Vol. 12(2002), p.977, in Chinese.

[10] W.W. Ding, T.D. Xia, W.J. Zhao, et al.: Trans. Nonferrous Met. Soc. China. Vol. 19(2009), p.1025, in Chinese.

[11] W.H. Jiang, X.L. Hang : Trans. Nonferrous Met. Soc. China. Vol. 8(1998), p.268, in Chinese.

[12] T. Motegi : light metal (Japan). Vol. 6(1995), p.339.

[13] [Japan] Ohno: Metal Solidification, Guangxi People Publishing House(1982).

[14] X.F. Liu, X.F. Bian, P.J. Xue, et al.: Mech. Eng. Vol. 35(1999), p.67.

[15] T.D. Xia, W.W. Ding, W.J. Zhao, et al.: Trans. Nonferrous Met. Soc. China. Vol. 19(2009), p.1948, in Chinese.