通过X射线衍射和SEM研究了铸态ZA27合金在160℃,30MPa时的压蠕变过程中的微观组织变化。结果表明,合金在压蠕变过程中产生了负蠕变,压蠕变促使亚稳相η′相的分解和四相转变的产生,即:α+ε→Τ′+η,四相转变导致合金体积膨胀从而引起负蠕变。随着压蠕变量的增大,合金的微观组织由片层状组织向球形组织变化,压蠕变诱发了合金在热处理时效过程中的相变。 The microstructural changes of as-cast ZA27 alloy under pressure creep at 160 ℃ and 30MPa were studied by X-ray diffraction and SEM. The results show that the alloy has a negative creep in the process of compression creep, and the creep deformation leads to the decomposition of the metastable phase η ’phase and the generation of four-phase transformation, ie α + ε → Τ’ + η, The alloy expands in volume causing negative creep. With the increase of creep creep, the microstructure of the alloy changes from lamellar structure to spherical structure, and the creep deformation induced the phase transformation of the alloy during the aging process.