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Ni-Fe-Cr-Nb合金中γ″(Ni_3Nb) 相沿{100}_γ以三种可能的取向共格析出。γ″通常是弥散的细小析出相,选区电子衍射谱是这三种取向γ″的电子衍射谱的迭加。对于某些晶带衍射,由于两种取向的γ″电子衍射谱与基体完全相重,而被基体衍射所覆盖,其中一种取向的γ″有时又可能不形核,这样对判断这两种取向γ″的存在带来一定困难。为此,本文研究了γ″和γ基体电子衍射谱的相重规律,以选择适当晶带衍射来判定相关取向γ″成核与否,并研究了基体衍射上或其周围的条纹花样或“卫星”斑点对于判断各种取向γ″存在的作用。
In the Ni-Fe-Cr-Nb alloy, the γ “(Ni_3Nb) phase is coherently precipitated along {100} _γ in three possible orientations.” Γ “is usually a dispersed fine precipitated phase and the selected area electron diffraction spectrum is the three orientations γ” For some crystal band diffraction, since the two oriented γ “electron diffraction spectra are completely opposite to the matrix and are covered by the diffraction of the matrix, one of the oriented γ” may not be shaped sometimes Nuclear, so to determine the existence of these two kinds of orientation γ “bring some difficulties. In this paper, we study the law of the phase-contrast of γ ”and γ matrix diffraction patterns to determine the appropriate orbital diffraction to determine whether the relevant orientation γ“ nucleation or not, and the stripe pattern or the ” The role of satellite “speckles in judging the presence of various orientations γ”.