Abstract: In this paper, the phase transformation of ZA27 alloy has been studied with TEM, SEM, x-Ray. The results show that there are the spinodal decomposition in the ZA27 alloy, and microstructure characteristic is tweed. The aging has got a spinodal decomposition along {111} aprocipitation after solution treated in temperatures 100℃ to 210℃. Spinodal decomposition of the as-cast has been produced by non-equilibrium solidification, and it can not be removed for short times aging.

Key words: ZA27合金, 时效, 铸造