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使用透射电子显微镜（ＴＥＭ），研究了一种沉淀强化合金ＭｏｎｅｌＫ－５００合金中沉淀相的形态、分布、粗化等行为．结果表明，即使长期时效，沉淀相仍保持球形形态，且均匀分布，反映了沉淀相－基体间极低的错配性；沉淀相的粗化是一体扩散过程，受Ａｌ，Ｔｉ原子在Ｎｉ－Ｃｕ基体上的扩散控制；合金的时效硬化来源于沉淀相对位错的阻碍作用，重要的影响因素是沉淀相的尺寸和体积分数
Transmission electron microscopy (TEM) was used to investigate the morphology, distribution and coarsening of the precipitated phase in a precipitation strengthened alloy, MonelK-500. The results show that the precipitated phase remains spherical and uniformly distributed even under long-term aging, which shows the very low mismatch between the precipitated phase and the matrix. The coarsening of the precipitated phase is an integrated diffusion process. Cu matrix diffusion control; age hardening of the alloy from the precipitation of the relative dislocation of the impediment, the important factor is the size of the precipitated phase and the volume fraction