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，HIP态试样电抛电压为15V、时间为5s。透射试样制备需通过机加工切取 0.3mm 厚薄片，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HIP态合金PPB界面相进行分析。

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 corrosion of the sample: First, the surface of the sample after mechanical polishing is electrolytically polished, and the electrolytic polishing liquid composition is 20vol.%H2SO4+80vol.%CH3OH. Different parameters are adopted for the sample in different process states. For the preparation of transmission samples, a 0.3mm thin sheet should be machined, ground to 40~50μm, and thinned with an electrolytic double spray thinner. The PPB interfacial phase of HIP alloys with different oxygen content was analyzed by TEM.