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用扫描透射电子显微镜（ＳＴＥＭ）综合分析研究改型Ｉｎｃｏｎｅｌ７１８合金中γ′／γ″纳米级复合相的形态、成分及晶体结构特征。采用大角暗场像（ＨＡＡＤＦ）及入射电子束斑直径为１纳米的无窗口Ｘ射线能谱（ＥＤＳ）分析。研究结果表明合金中微量元素Ａｌ，Ｔｉ及Ｎｂ含量及相对比例改变，对γ′／γ″相复合析出及形态有很大的影响
The morphology, composition and crystal structure of the γ ’/ γ "nanocomposite phase in the modified Inconel 718 alloy were investigated by scanning electron microscopy (SEM). The dark field image (HAADF) and incident electron beam spot diameter Windowless X-ray energy dispersive spectroscopy (EDS) analysis.The results show that the contents and relative proportions of Al, Ti and Nb in the alloy have a great influence on the composite precipitation and morphology of γ ’/ γ phase