The microstructure evolution in Re–Ru containing high generation Ni-base single crystal superalloy has been investigated during long-term isothermal exposure at 1000°C. The chemical and physical characteristics are determined by means of differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) measurements. In addition to the initial γ/γ’ phase structure, formation of HCP-structured Re–Ru–Ni-rich phase is confirmed. Based on high-resolution TEM imaging and phase structure analysis the theoretical atomistic model presenting the interfaces between the phases was constructed and evaluated with respect to precipitation kinetics. Growth of plate-like precipitates occurs mainly through the plate edge area due to stacking fault sequences between the surrounding matrix and the precipitates, while thickening is very limited due to good coherency with the surrounding phase in the longitudinal direction.

研究了在 1000°C 下长期等温暴露期间，含 Re-Ru 的高代 Ni 基单晶高温合金的微观结构演变。化学和物理特性通过差示扫描量热法 (DSC)、X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM) 测量确定。除了初始的 γ/γ' 相结构外，还确认了 HCP 结构的富 Re-Ru-Ni 相的形成。基于高分辨率 TEM 成像和相结构分析，构建并评估了相间界面的理论原子模型，并评估了沉淀动力学。