The diffusivities of fcc Ni-rich Ni–Cu–Ti alloy have been systematically investigated by means of experimental measurements and an intelligent modeling. Utilizing two bulk diffusion couples without intersection points in diffusion paths together with electron probe microanalysis technique, the interdiffusion coefficients along the whole diffusion path in fcc Ni–Cu–Ti alloy at 1273, 1373 and 1473 K are determined by a novel numerical inverse method. Three new diffusion couples together with two initial diffusion couples are used to obtain the diffusivities by Matano-Kirkaldy method. Two sets of atomic mobilities are established based on the interdiffusion coefficients obtained using numerical inverse method and Matano-Kirkaldy method, respectively, through an intelligent modeling in CALTPP (CALculation of ThermoPhysical Properties) program. The reliability of present two sets of atomic mobilities is verified by comprehensive comparisons between the calculated and experimental properties, including diffusivities, concentration profiles and diffusion paths. A preferable agreement is found in the comparisons where the diffusivities are calculated using numerical inverse method. The present investigation of diffusivities for fcc Ni–Cu–Ti alloy demonstrates that two diffusion couples combined with the numerical inverse method can establish a reliable atomic mobility for the targeted alloys.

fcc富镍Ni–Cu–Ti合金的扩散率已通过实验测量和智能建模系统地进行了研究。利用新颖的数值逆方法，利用电子探针微分析技术和电子探针显微分析技术，在扩散路径中利用两个没有扩散点的本体扩散对，沿着整个扩散路径的扩散系数在fcc Ni-Cu-Ti合金中于1273、1373和1473K。通过Matano-Kirkaldy方法，使用三个新的扩散对以及两个初始扩散对来获得扩散率。通过CALTPP（热物理性质计算）程序中的智能建模，分别基于使用数值逆方法和Matano-Kirkaldy方法获得的互扩散系数，建立了两组原子迁移率。通过计算和实验性质（包括扩散率，浓度分布和扩散路径）之间的全面比较，验证了当前两组原子迁移率的可靠性。在比较中找到了较好的一致性，在比较中，使用数值逆方法计算了扩散率。目前对fcc Ni-Cu-Ti合金扩散率的研究表明，两个扩散偶结合数值逆方法可以为目标合金建立可靠的原子迁移率。在比较中找到了较好的一致性，在比较中，使用数值逆方法计算了扩散率。目前对fcc Ni-Cu-Ti合金扩散率的研究表明，两个扩散偶结合数值逆方法可以为目标合金建立可靠的原子迁移率。在比较中找到了较好的一致性，在比较中，使用数值逆方法计算了扩散率。目前对fcc Ni-Cu-Ti合金扩散率的研究表明，两个扩散偶结合数值逆方法可以为目标合金建立可靠的原子迁移率。