Utilizing the solid–solid diffusion couples with the electron probe microanalysis technique, the composition-dependent ternary interdiffusion coefficients in fcc Al-Cu-Sn alloys at 1073 K were determined via the Whittle and Green method. Based on the experimentally determined interdiffusion coefficients at 1073 K combined with thermodynamic descriptions of fcc phase, atomic mobilities of Al, Cu, and Sn in fcc Al-Cu-Sn alloys were assessed by using CALTPP (Calculation of thermophysical properties) software. The quality of the assessed kinetic characteristics was confirmed by the comprehensive comparisons between various model-predicted diffusion behaviors and the experimental ones, including concentration profiles and diffusion paths.

中文翻译：

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富铜 fcc Cu-Al-Sn 合金在 1073 K 时的扩散率和原子迁移率

利用固-固扩散耦合和电子探针微量分析技术，通过惠特尔和格林方法确定了在 1073 K 时 fcc Al-Cu-Sn 合金中与成分相关的三元互扩散系数。根据实验确定的 1073 K 下的互扩散系数，结合 fcc 相的热力学描述，使用 CALTPP（热物理性能计算）软件评估 fcc Al-Cu-Sn 合金中 Al、Cu 和 Sn 的原子迁移率。通过各种模型预测的扩散行为与实验行为（包括浓度分布和扩散路径）之间的综合比较，证实了评估动力学特性的质量。