The distributions of tungsten (W) in Ni-based single crystal superalloys with different Re and Ta contents are characterized and specified by atom probe tomography. The results show that Ta changes the partitioning behavior of W and rejects it from the γ′-precipitate to the γ-matrix, while Re shows the opposite effect, which is consistent with the simulations via Thermo-Calc. Moreover, significant behaviors of W segregation at γ/γ′ interface are found in 2Ta2Re, 5Ta2Re, and 5Ta0Re alloys, contributing to the decrease in the interfacial energy. W interfacial segregations are conducive to decrease the interfacial energy. By comparing alloys with different W contents, W segregation is irrelevant to the W content, but highly W-partitioning-dependent. Additionally, nano-indentation tests also show that the addition of Re can significantly increase the hardness of γ-matrix, while Ta is conducive to strengthen within both γ-matrix as well as γ′-precipitates which is clarified by the solid solution strengthening calculations.

通过原子探针断层扫描表征和指定了不同 Re 和 Ta 含量的 Ni 基单晶高温合金中钨 (W) 的分布。结果表明，Ta 改变了 W 的分配行为，将其从 γ'-沉淀物排斥到 γ-基质，而 Re 表现出相反的效果，这与 Thermo-Calc 的模拟结果一致。此外，在 2Ta2Re、5Ta2Re 和 5Ta0Re 合金中发现 γ/γ' 界面处的 W 偏析明显，导致界面能降低。W界面偏析有利于降低界面能。通过比较不同 W 含量的合金，W 偏析与 W 含量无关，但高度依赖于 W 分配。此外，