利用透射电子显微镜(TEM)研究了Cu-1.2Ni-l.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.
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