Abstract Aluminum-magnesium (Al–Mg) binary system is the basis of many important Al and Mg alloys. The thermodynamic and atomic-diffusional behaviors of Al-rich or Mg-rich alloys have been extensively studied. However, it is not well understood for the thermodynamic and atomic-diffusional behaviors in Al–Mg intermetallic compounds (IMCs) such as Al140Mg89 (β), Al30Mg23 (e), and Mg17Al12 (γ), which significantly influence the microstructure and performance of Al and Mg alloys. In this paper, the most complete and self-consistent thermodynamic and atomic-diffusional databases have been constructed using CALculation of PHAse Diagram (CALPHAD) modeling and experimental data in literature. The following are reported for the first time: 1) the homogeneity in Al140Mg89 (β), Al30Mg23 (e), and Mg17Al12 (γ) IMCs assessed and validated using the most recent experimental results; and 2) the atomic diffusion mobility in Al140Mg89 (β), Al30Mg23 (e), and Mg17Al12 (γ) IMCs with their interdiffusion coefficients validated by experiments. The new databases have been further validated by diffusion couple experiments, demonstrating their applicability in controlling atomic-diffusion at interface, quantitative microstructure simulation, and development of engineering applications of Al–Mg and Mg–Al based alloys and systems. The present fundamental methodology and modeling principles are applicable to all materials and engineering applications.

中文翻译：

---

评估铝镁合金体系中金属间化合物的相平衡和原子迁移率

摘要 铝镁（Al-Mg）二元体系是许多重要的铝镁合金的基础。已经广泛研究了富铝或富镁合金的热力学和原子扩散行为。然而，Al-Mg 金属间化合物（IMCs）如 Al140Mg89 (β)、Al30Mg23 (e) 和 Mg17Al12 (γ) 的热力学和原子扩散行为尚不清楚，它们显着影响了合金的微观结构和性能。铝和镁合金。本文采用CALculation of PHAse Diagram（CALPHAD）模型和文献中的实验数据构建了最完整和自洽的热力学和原子扩散数据库。以下为首次报道：1) Al140Mg89 (β), Al30Mg23 (e), 和 Mg17Al12 (γ) IMC 使用最新的实验结果进行评估和验证；和 2) Al140Mg89 (β)、Al30Mg23 (e) 和 Mg17Al12 (γ) IMC 中的原子扩散迁移率及其相互扩散系数通过实验验证。新数据库已通过扩散偶实验进一步验证，证明了它们在控制界面原子扩散、定量微观结构模拟以及开发 Al-Mg 和 Mg-Al 基合金和系统的工程应用方面的适用性。目前的基本方法和建模原理适用于所有材料和工程应用。新数据库已通过扩散偶实验进一步验证，证明了它们在控制界面原子扩散、定量微观结构模拟以及开发 Al-Mg 和 Mg-Al 基合金和系统的工程应用方面的适用性。目前的基本方法和建模原理适用于所有材料和工程应用。新数据库已通过扩散偶实验进一步验证，证明了它们在控制界面原子扩散、定量微观结构模拟以及开发 Al-Mg 和 Mg-Al 基合金和系统的工程应用方面的适用性。目前的基本方法和建模原理适用于所有材料和工程应用。