An Analytical Model for Solute Segregation at Liquid Metal/Solid Substrate Interface

作者：Men Hua^*; Fan Zhongyun

来源：Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2014, 45A(12): 5508-5516.

DOI：10.1007/s11661-014-2525-5

In this paper, we present an analytical model for describing the equilibrium solute segregation at the interface between metallic liquid (an A-B solution, where A is solvent and B is solute) and a solid substrate (S) using approaches of thermodynamics and statistical mechanics. This analytical model suggests that the interfacial solute segregation is governed by the difference in interfacial energies between the pure B/S and pure A/S interfaces, the heat of mixing of the A-B solution and the difference in entropies of fusion between pure solute and solvent. The calculated solute segregations at the interface in the liquid Al-Ti/TiB2 and liquid Sn-Al/Al2O3 systems are in qualitative agreement with the experimental observations. It is demonstrated that the present analytical model can be used to predict the solute segregation at the liquid/substrate interface, at least qualitatively.

• 出版日期2014-11