A correlative approach is employed to simultaneously assess structure and chemistry of (carbide and boride) precipitates in a set of novel Co/Ni-base superalloys. Structure is derived from electron backscatter diffraction (EBSD) with pattern template matching, and chemistry obtained with energy dispersive X-ray spectroscopy (EDS). It is found that the principal carbide in these alloys is Mo and W rich with the M₆C structure. An M₂B boride also exhibiting Mo and W segregation is observed at B levels above approximately 0.085 at. pct. These phases are challenging to distinguish in an SEM with chemical information (EDS or backscatter Z-contrast) alone, without the structural information provided by EBSD. Only correlative chemical and structural fingerprinting is necessary and sufficient to fully define a phase. The identified phases are dissimilar to those predicted using ThermoCalc. We additionally perform an assessment of the grain boundary serratability in these alloys, and observe that significant amplitude is only obtained in the absence of pinning intergranular precipitates.

相关方法用于同时评估一组新型Co / Ni基高温合金中（碳化物和硼化物）沉淀物的结构和化学性质。结构来自具有模式模板匹配的电子背散射衍射（EBSD），以及通过能量色散X射线光谱（EDS）获得的化学结构。发现这些合金中的主要碳化物是具有M ₆ C结构的Mo和W富集。安M ₂在高于约0.085at的B水平观察到硼化物也表现出Mo和W偏析。pct。在没有EBSD提供的结构信息的情况下，仅凭化学信息（EDS或反向散射Z对比度）在SEM中很难区分这些阶段。仅相关的化学和结构指纹分析是必要的，并且足以完全定义一个相。识别出的相与使用ThermoCalc预测的相不同。我们还对这些合金的晶界可锯齿性进行了评估，并观察到只有在没有钉扎晶间析出物的情况下才能获得明显的振幅。