FGH96合金中的析出相主要包括γ′相和碳化物，通过扫描电镜背散射模式（BSE）或二次电子模式（SE）进行观察分析。BSE模式可直接采用机械抛光的试样；SE模式需对使用电解抛光与电解腐蚀试样：首先对经过机械抛光后的HT试样表面进行电解抛光，电解抛光液成分为20vol.%H2SO4+80vol.%CH3OH，不同工艺态试样采用不同参数，HT态试样电抛电压为15V、时间为15s。TEM采集方案：通过机加工线切割切HT态合金约 0.3mm 厚的薄片，并研磨至 40~50μm，使用电解双喷减薄仪进行减薄。通过TEM对不同氧含量HT态合金进行观察，分析氧含量的变化对合金PPB界面的影响。

The precipitated phase in FGH96 alloy mainly consists of γ 'phase and carbide, which are observed and analyzed by scanning electron microscope backscattering mode (BSE) or secondary electron mode (SE). BSE mode can directly use the mechanically polished sample; The SE mode requires electrolytic polishing and electrolytic etching of the samples: First, the surface of the mechanically polished HT sample is electrolytically polished, and the composition of the electrolytic polishing liquid is 20vol.%H2SO4+80vol.%CH3OH. Different parameters are adopted for the samples in different process states. TEM acquisition scheme: Thin slices of HT alloy about 0.3mm thick were machined and ground to 40~50μm, and thinned by electrolytic double-spray thinning instrument. HT alloys with different oxygen content were observed by TEM, and the effect of oxygen content on PPB interface was analyzed.