Numerical Study on the Impact of Second Phase Content on the Solidification of Al-Pb Hypermonotectic Alloys

Abstract:

Based on the Euler-Euler method and the conservation equation, a mathematical model for describing the non-steady processes of mass transfer, transmission, heat transfer, solute transport and nonstationary process of nucleation in liquid-liquid separation of Al-Pb monotectic alloys was established. The influence of the second phase content on the solidification microstructure of Al-Pb alloy was analyzed by numerical simulation by combining the calculated temperature field and velocity field with the kinetic equation of controlling solidification microstructure evolution. The results show that the lower the second phase content is, the more uniform the temperature field distribution is, and the lower the velocity of the second phase droplets is. The average diameter and volume fraction of the second phase droplets in the Al-5wt%Pb alloy samples were lower than that in the Al-10wt%Pb alloy samples under the same conditions. It is concluded that the lower the content of the second phase, the liquid - liquid phase separation and decomposition behavior of liquid immiscible liquid in the immiscible zone are relatively slow, and the more easily the droplets of the second phase are distributed uniformly in alloy solidification structure of the matrix.

• Periodical: Materials Science Forum (Volume 896)
• Pages: 209-215
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.896.209
• Online since: March 2017
• Authors: Zhi Qiang Kang*, Yu Bo Zhang, Xue Yang, Guo Hui Feng, Lin Zhang
• Keywords: Alloy Composition, Al-Pb Monotectic Alloy, Numerical Simulation, Solidification Microstructure

References

[1] L Zhang, E.G. Wang, X.W. Zuo, et al. Effect of magnetic field on liquid-liquid separation of Cu-Pb-La hypermonotectic alloy, J . Rare Metal Material and Engineering, 44 (2015) 344-349.

[2] J.Y. Zhao, L.Q. Liu. Effect of Directional solidification rate on solidified structure of Al-Bi monotectic composition alloy and computer analysis ,J. Foundry Tecnology, 36(2015) 994-996.

[3] H.L. Li, J.Z. Zhao. Modelling and simulation of the microstructure formation in a strip cast Al-Pb alloy ,J. Act a Metallurgica Sinica, 46(2010) 695-700.

DOI: 10.3724/sp.j.1037.2010.00695

[4] C. Shu, J . Z . Zhao, H. X . Jiang, et al. Microstructure evolution of a ternary monotectic alloy during directional solidification ,J. Acta Metall, 28(2015) 316-321.

DOI: 10.1007/s40195-014-0199-z

[5] H.L. Li, c , Z.G. Li, at el. Process of monotectic alloy Al-Pb with static magnetic Field ,J. Special Casting & Nonferrous Alloys, 32 (2012) 866-868.

[6] Z.Q. Kang, E.G. Wang, L. Zhang, et al. Simulation and analysis of liquid-liquid separation mechanism of hypermonotectic Al-Bi alloy, J. Journal of Northeastern University(Natural Science), 9 (2010) 1262-1265.

[7] X.D. Zhang, S.W. Wang, Z.X. Na, at el. Effect of magnetic field on the solidification of metallic materials ,J. Journal of Iron and Steel Research, 26 (2014) 1-7.

[8] Y.C. Yang, Z.X. Fu, Y. Shen, et al. Model for Solidification Microstructure Simulation of Ag-Cu Alloy,J. Precious Metals, 33 (2012) 33-38.

[9] Q. h. Zuo. Thermal physical properties of materials with non-homogenous nucleation of liquid drop, J. Basic Sciences Journal of Textile Universities, 9 (1996) 82-86.

[10] P. Thévoz, J.L. Desbiolles, M. Rappaz. Modeling of equiaxed microstructure formation in casting[J], Metallurgical and Materials Transactions A, 20A (1989) 311-317.

DOI: 10.1007/bf02670257

[11] J.Z. Zhao. Zn-Pb monotectic alloy liquid separation mechanism and the solidification behavior, D. Harbin: Institute of Technology, China, (1994).

[12] L. Ratke, S. Diefenbach. Liquid immiscible alloys,J. Materials Science and Engineering R: Reports. 15(1995), 263-268.

DOI: 10.1016/0927-796x(95)00180-8