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一般认为Spinodal分解的特征是(1)形成调幅组织(垂直于(100)方向出现波状条纹衍衬象),(2)电子衍射中出现卫星斑点。但如果把出现这两个特征的时效过程都判定为Spinodal分解是不充分的。Ardell等认为调幅组织可以不通过Spinodal分解而通过形核一长大机理,即由于长大过程中应变能的各向异性而形成。宫崎享等对Ni—38Cu—5Ci(at％) 合金的时效研究认为该合金在500℃时效为Spinodal分解,本文用EM400T型电镜对与此成分相近的Ni—38Cu—6Si(at％)合金在580℃的时效过程进行研究,发现当采用不同的成象方法,能获得不同的衍衬象,从而得出不同的结论。
Spinodal decomposition is generally believed to be characterized by (1) formation of an amplitude modulated tissue (wavy fringe pattern perpendicular to (100)), and (2) satellite spots in electron diffraction. However, it is not sufficient to judge the aging process of these two features as Spinodal decomposition. Ardell et al. Argue that AM can be formed by nucleation and growth without Spinodal decomposition, which is due to the anisotropy of strain energy during growth. Miyazaki enjoy the Ni-38Cu-5Ci (at%) alloy aging study that the alloy at 500 ℃ aging Spinodal decomposition, the EM400T electron microscopy with the composition similar to the Ni-38Cu-6Si (at%) alloy The aging process at 580 ° C was studied and it was found that when different imaging methods were used, different diffraction pattern images were obtained, leading to different conclusions.