On the basis of 13 groups of single-phase diffusion couples together with electron probe microanalysis technique, the composition profiles in γ and γ′ Ni–Al–Co systems at 1373–1523 K were measured. Atomic mobilities in γ Ni–Al–Co alloys were directly assessed from 9 groups of concentration profiles by means of HitDIC software. The established atomic mobilities contain only two interaction parameters, and their reliability was verified by comprehensively comparing the model-predicted concentration profiles with the experimental data in the literature and the present work. After that, the composition-dependent interdiffusion coefficients along the entire diffusion path in γ and γ′ Ni–Al–Co alloys were also evaluated at 1373–1523 K by using HitDIC. ${\tilde{D}}_{AlAl}^{Ni}$ and ${\tilde{D}}_{CoCo}^{Ni}$ in γ Ni-Al-Co alloys were validated by the results obtained by Matano-Kirkaldy method and the corresponding experimental values in Ni-Al and Ni-Co binary alloys. Comprehensive comparisons between the interdiffusion coefficients in the present work and those reported the literature validated the reliability of the presently evaluated interdiffusivities in γ’ Ni-Al-Cr alloys. The influences of Al and X contents on the ${\tilde{D}}_{XX}^{Ni}$ in γ Ni-Al-2 at% X (X= Co, Rh, Ta, W, Re, Os, and Ir) alloys and ${\tilde{D}}_{AlAl}^{Ni}$ in γ Ni-2 at% Al-X alloys were further discussed.

在13组单相扩散偶和电子探针微量分析技术的基础上，测量了γ和γ'Ni-Al-Co体系在1373-1523 K的成分分布。γ Ni-Al-Co 合金中的原子迁移率通过 HitDIC 软件从 9 组浓度分布直接评估。建立的原子迁移率仅包含两个相互作用参数，通过将模型预测的浓度分布与文献和当前工作中的实验数据进行综合比较，验证了它们的可靠性。之后，还通过使用 HitDIC 在 1373-1523 K 下评估了 γ 和 γ' Ni-Al-Co 合金中沿整个扩散路径的成分相关互扩散系数。${\stackrel{～}{D}}_{\mathrm{一种}升\mathrm{一种}升}^{N\mathrm{一世}}$ 和 ${\stackrel{～}{D}}_{C○C○}^{N\mathrm{一世}}$通过 Matano-Kirkaldy 方法获得的结果和 Ni-Al 和 Ni-Co 二元合金中的相应实验值验证了 γ Ni-Al-Co 合金中的 。当前工作中的相互扩散系数与文献报道的相互扩散系数之间的综合比较验证了目前评估的 γ' Ni-Al-Cr 合金相互扩散系数的可靠性。Al 和 X 含量的影响${\stackrel{～}{D}}_{XX}^{N\mathrm{一世}}$ 在 γ Ni-Al-2 at% X（X= Co、Rh、Ta、W、Re、Os 和 Ir）合金和 ${\stackrel{～}{D}}_{\mathrm{一种}升\mathrm{一种}升}^{N\mathrm{一世}}$ in γ Ni-2 at% Al-X 合金进行了进一步讨论。