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利用透射电子显微镜(TEM)研究了Cu-1.2Ni-1.6Co-0.6Si合金时效组织的演变规律,同时分析了该合金时效析出相的尺寸分布及粗化长大行为,并用扩散控制长大的LSW理论进行对比分析。结果表明,Co替代部分Ni后的合金组织未经历调幅组织、有序化的组织演变,而是析出相直接析出,这是由于Co抑制了调幅分解形成所需的空位移动和促进析出相的析出的缘故。而时效析出相尺寸分布及其粗化行为与LSW理论模型较好地符合,析出相的平均半径与t1/3成线性关系,说明其析出相的粗化长大过程受扩散控制。
The evolution of the aging microstructure of Cu-1.2Ni-1.6Co-0.6Si alloy was studied by transmission electron microscopy (TEM). The size distribution, coarsening and growth behavior of the precipitated phase were also analyzed. LSW theory for comparative analysis. The results show that the Co alloy replaces part of Ni alloy without AM and ordered organizational evolution, but the precipitation of precipitated phase, which is due to the inhibition of Co formation of vacancies required for the formation of displacement and promote the precipitation precipitation The reason. The size distribution and the roughening behavior of the precipitated phase are in good agreement with the LSW theoretical model. The average radius of the precipitated phase is linear with t1 / 3, indicating that the precipitated phase is controlled by diffusion.