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在点阵波理论基础上 ,通过假定Cu 4wt%Ti合金中溶质原子浓度的适当分布并建立与之相应的衍射波波幅表达式 ,利用计算机模拟得该合金调幅分解与有序化共存时X射线衍射边带形貌 ,其波形与实验结果颇为相近 ;进一步根据波的叠加原理在两相互垂直方向上对上述衍射形貌合成 ,获得Cu 4wt%Ti合金 40 0℃时效较长时间同时出现的D1a型和B2型复杂有序化超点阵斑 ,其强度与位置分布均与透射电镜 (TEM)衍射谱完全一致
On the basis of the lattice wave theory, by assuming the appropriate distribution of solute atoms concentration in Cu 4wt% Ti alloy and establishing the corresponding diffraction wave amplitude expression, the X-ray diffraction The morphology of the diffraction sidebands is quite similar to the experimental ones. According to the principle of superposition of waves, the above-mentioned diffraction profiles were synthesized in two perpendicular directions to obtain the simultaneous appearance of Cu 4wt% Ti alloy at 40 ℃ for a long time The complex ordered hyperplasia patterns D1a and B2 have the same intensity and position distribution as the TEM diffraction patterns