本文利用X衍射仪和透射电子显微镜研究了ZnA127Cu2Mg0.01合金自然时效过程中η相的析出速度和析出方式。η相的析出主要依靠胞状析出,但在时效初期,η相也会连续析出。特别强调的是,某些晶内连续析出的η相也会作为核心使晶内胞状析出得以进行。本文还建立了η相的生长模型,定量的描述了η相的析出速度。 In this paper, X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to study the precipitation rate and precipitation mode of η phase during the natural aging process of ZnA127Cu2Mg0.01 alloy. The precipitation of η phase depends mainly on the cell-like precipitation, but in the early aging, η phase will be precipitated continuously. It is especially emphasized that the eutectic η phase in some of the crystals will also serve as the core for intracellular precipitation of cells. In this paper, the growth model of η phase is also established, which quantitatively describes the precipitation rate of η phase.