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在商业Ｉｎｃｏｎｅｌ７１８合金中存在３种成分非常接近的析出相：δ－Ｎｉ３Ｎｂ（Ｔｉ，Ａｌ），γ″－Ｎｉ３Ｎｂ（Ｔｉ，Ａｌ）和γ′－Ｎｉ３Ａｌ（Ｔｉ，Ｎｂ），而且在标准热处理状态下，析出相很小，即使运用ＥＤＡＸ微区成分分析方法也难以区分．尽管３种析出相结构不同，但γ″相的３种变体和δ相的１２种变体导致两者众多衍射斑点的重合，增加了实验鉴别的困难．通过矩阵变换，研究了这两种析出相衍射斑点的重合位置，从而找出了鉴别晶界析出相类型的可靠方法
In the commercial Inconel 718 alloy, there are three precipitates with very close composition: δ-Ni3Nb (Ti, Al), γ “-Ni3Nb (Ti, Al) and γ’-Ni3Al (Ti, Nb) , The precipitates are small and difficult to distinguish even with the EDAX micro-compositional analysis method. Although the three precipitates have different structures, the three variants of γ ”phase and the 12 variants of δ phase lead to many diffraction spots Coincidence, increasing the difficulty of experimental identification. Through the matrix transformation, the overlapping position of the diffraction spots of the two precipitates was studied, and a reliable method for identifying the types of precipitates in the grain boundaries was found