(中南大学 材料科学与工程学院，长沙 410083)
摘 要: 基于Butler方程，结合热动力学数据和CALPHAD优化的过剩吉布斯自由能参数，计算Al-Mg、Mg-Er和Al-Er二元合金的表面张力。结果表明：在镁熔体中加入元素铝和铒时，将增加该熔体的表面张力。通过计算Al-Mg、 Mg-Er和Al-Er二元合金的过剩表面张力，发现过剩表面张力与过剩吉布斯自由能之间相对理想溶液偏差性质相反。选择铒为非对称性组元，并在此基础上结合Toop模型计算Al-Mg-Er三元合金的表面张力。结果表明：Al-Mg-Er三元合金的表面张力值基本在0.356~0.783 N/m之间，且随着铒含量的增加，表面张力呈增大的趋势。
关键字: Al-Mg-Er三元合金；表面张力；Butler方程；Toop模型
Butler’s equation
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Based on Butler’s equation, the surface tensions of Al-Mg, Mg-Er and Al-Er binary alloys were calculated in combination with thermodynamic data and excess Gibbs energies parameters calculated by CALPHAD technology. The results show that the surface tension of Mg melts increases with the additions of Al and Er. Calculating the excess surface tensions of Al-Mg, Mg-Er and Al-Er binary alloys, the excess surface tensions and excess Gibbs energies have an opposite deviation compared with ideal solution. Choosing Er as the asymmetric component in asymmetric model and combining with Toop model, the surface tension of Al-Mg-Er ternary alloy were calculated. The results indicate that the surface tension of Al-Mg-Er ternary alloy is approximately in the range of 0.356−0.783 N/m, and the surface tension increases with increasing the addition of Er element.
Key words: Al-Mg-Er ternary alloy; surface tension; Butler’s equation; Toop model
