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对于面心立方点阵晶体,基体的指数较低(0≤w≤v≤u≤3)的倒易面上的倒易阵点一般与指数较高的孪晶倒易面上的倒易阵点完全相重,计算了与这些基体倒易面相应的、沿基体四个孪生面孪生的孪晶倒易面上一层倒易阵点的投影位置。借助于此,可判断面心立方点阵晶体中,特别是大单胞尺寸的薄品中孪晶的存在。在确认5Cr21Mn9Ni4WNb2N钢晶界M_(23)C_6孪晶的应用中,证明这是可取的有效方法。
For the face-centered cubic lattice crystal, the matrix matrix has a lower index (0≤w≤v≤u≤3) on the reciprocal face and the reciprocal matrix on the reciprocal face of the twin with higher index The points are completely weighted, and the projection positions corresponding to the reciprocal planes of the twin reciprocal planes on the twins of the four twin planes of the substrate corresponding to the reciprocal planes of the substrates are calculated. With this, it is possible to determine the presence of twins in a face-centered cubic lattice crystal, especially in a large cell size thin article. In confirming the 5Cr21Mn9Ni4WNb2N grain boundary M_ (23) C_6 twins application, this is proved to be an effective method.