(中南大學 材料科學與工程學院，長沙 410083)
摘 要: 基于Butler方程，結(jié)合熱動力學數(shù)據(jù)和CALPHAD優(yōu)化的過剩吉布斯自由能參數(shù)，計算Al-Mg、Mg-Er和Al-Er二元合金的表面張力。結(jié)果表明：在鎂熔體中加入元素鋁和鉺時，將增加該熔體的表面張力。通過計算Al-Mg、 Mg-Er和Al-Er二元合金的過剩表面張力，發(fā)現(xiàn)過剩表面張力與過剩吉布斯自由能之間相對理想溶液偏差性質(zhì)相反。選擇鉺為非對稱性組元，并在此基礎(chǔ)上結(jié)合Toop模型計算Al-Mg-Er三元合金的表面張力。結(jié)果表明：Al-Mg-Er三元合金的表面張力值基本在0.356~0.783 N/m之間，且隨著鉺含量的增加，表面張力呈增大的趨勢。
關(guān)鍵字: Al-Mg-Er三元合金；表面張力；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
