Stability of Solid/Liquid Interface of Pb-80wt%Sn Alloy under Direct Current during Directional Solidification

Abstract:

The effect of medium-density current on the morphological stability of S/L interface of Pb-80wt%Sn alloy during directional solidification was investigated. The results indicated that both the DC of positive and negative 200 Acm^-2 could decrease the critical growth rate of cellular/dendrite transition and minish the range of growth rate of cellular crystal. DC accelerated the microstructure transition from cellular crystal to dendrite crystal at the same pulling rate. Furthermore, the dendrite crystal was refined by positive and negative DC at high pulling rate. The effect of direction of DC to the microstructure transition could be neglected. In conclusion, the positive and negative 200 Acm^-2 decreased the stability of solid/liquid interface of Pb-80%Sn alloy, and the lower the pulling rate was applied, the more obviously DC affected the microstructure.

• Periodical: Applied Mechanics and Materials (Volumes 313-314)
• Pages: 245-248
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.313-314.245
• Online since: March 2013
• Authors: Ning Li, Rong Zhang, Li Min Zhang, Li Fei Du, Qian Liu
• Keywords: Direct Current (DC), Directional Solidification, Stability of Solid/Liquid Interface

References

[1] J.C. Warner and J.D. Verhoeven: Metall. Trans. Vol. 4 (1973), p.1257

[2] SW.А. Leontiev: metal science and the term processing Vol. 5 (1978), p.49

[3] G.D. Gu: Ph.D. degree thesis, Harbin Institute of Technology, Harbin, China (1989)

[4] A.A. Wheeler, S.R. Coriell, G.B. Mcfadden, et al.: J. Cryst. Growth Vol. 88 (1988), p.1

[5] М.А. Abraliev: Svarproizv Vol. 5 (1978), p.1

[6] G.W. Chang, J.P. Yuan, Z.D. Wang, et al.: Trans. Nonferrous Met. Soc. Chin. Vol. 20 (2000), p.445

[7] A.A. Wheeler, G.B. Mcfadden, S.R. Coriell, et al.: J. Cryst. Growth Vol. 100 (1990), p.78

[8] Y.S. Yang, Y.J. Li, X.H. Feng, et al.: 5th Int. Symp. EPM, Sendai, Japan (2006), p.428