ABSTRACT

We have used a theoretical model based on the assumption of compound formation in binary alloys to study the thermodynamic, microscopic and surface properties of Bi-Pb and In-Pb liquid alloys. A review of the phase diagrams for these alloys shows that one of the stable complexes for Bi-Pb liquid alloy is BiPb₃; also that In-Pb is a stable phase in liquid In-Pb alloys. Using the same interaction parameters that are fitted for free energy of mixing, we have been able to compute the bulk and thermodynamic properties of the alloys. From our observations, we are able to show that the Bi-Pb liquid alloy exhibits compound formation over the whole concentration range and the In-Pb alloys undergo phase separation. With regard to surface properties Pb segregates more to the surface in In-Pb alloys than in Bi-Pb alloys. The viscosity isotherms have positive deviation from ideality for both Bi-Pb and In-Pb alloys.

摘要

我们使用基于二元合金中化合物形成假设的理论模型来研究 Bi-Pb 和 In-Pb 液态合金的热力学、微观和表面特性。对这些合金相图的回顾表明，Bi-Pb 液态合金的稳定配合物之一是 BiPb ₃; 此外，In-Pb 是液态 In-Pb 合金中的稳定相。使用适合混合自由能的相同相互作用参数，我们已经能够计算合金的体积和热力学特性。根据我们的观察，我们能够证明 Bi-Pb 液态合金在整个浓度范围内都表现出化合物形成，而 In-Pb 合金发生相分离。关于表面特性，Pb 在 In-Pb 合金中比在 Bi-Pb 合金中更多地偏析到表面。对于 Bi-Pb 和 In-Pb 合金，粘度等温线与理想情况有正偏差。