Phase-Field Model for Spinodal Decomposition of Dilute Solute Field in Al-Ag Alloy

Abstract:

The typical Landau free energy functional with the fourth power of a solute composition field is not suitable for representing spinodal decomposition of a dilute Ag solute field in Al-Ag alloy. Facing this challenge, a new free energy density function is proposed for spinodal decomposition of a dilute Ag solute field of Al-Ag alloy. The evolution of the solute field in Al-4.2% Ag alloy is studied by phase-field method using this new function. The simulated results reveal that the precipitate free zone (PFZ) around the precipitated phase is an ellipse and its width is about two times that of phase, while in the region far from PFZ, a GPZ pattern of Ag solute field appears due to spinodal decomposition.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 1168-1170
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.1168
• Online since: December 2011
• Authors: Ying Jun Gao, Zhi Rong Luo
• Keywords: Al-Ag Alloy, Phase-Field Method, Spinodal Decomposition

References

[1] Mondolfo L F. Structure and Propertys of Aluminum Alloys. London: Butterworths Press, (1976), P. 200.

[2] Moore K T, House J M. Acta Mater, 48(2000), P. 4083.

[3] Moore K T, House J M. Acta Mater, 50(2002), P. 943.

[4] House J M., Prabhu N. Acta Metell Mater, 38(1990), P. 881.

[5] Prabhu N, House J M. Acta Metell Mater, 38(1990), P. 889.

[6] Gao Yingjun, Zhao Mao, Huang Chuangga,. Precious Met, 26(2005). P. 1.

[7] Gao Yingjun, Zhao Mao, Huang Chuanggao. Precious Met, 26(2005), P. 21.

[8] Fan D N, Chen L Q. Acta Mater. 45(1997), P. 3297.

[9] Moelans N, Blanpain B, Wollants P. Acta Mater, 54(2006), P. 1175.

[10] Gao Yingjun, Zhang Hailin, Jin Xi, Huang Chuanggao. Acta Metal Sin, 45(2009), P. 1190.

[11] H. W. King, J Mater Sci, 1(1966), P. 79.

[12] You Y, Yan M F, Chen Y Q. Acta Metal Sin, 44(2008), P. 1171.

[13] Jingzhi Zhu, Long-qing Chen. Phys Rev E, 60(1999), P. 35649.