中文摘要：

利用扫描电镜和透射电镜观察分析了热等静压HIPFGH95高温合金经热处理后，基体中γ＇相的形貌、分布和稳定性。结果表明：合金经热处理后基体为再结晶晶粒与原始枝晶的混晶组织。基体中除了晶界上分布的固溶处理未溶的棒状γ＇相颗粒外，在再结晶晶粒内部还存在有大、中、小3种尺寸的γ＇颗粒，其中大的方形γ＇相颗粒尺寸约为0．5～0．8μm，并呈8个一组排列，此8个一组排列的y’相颗粒是由合金在1160℃固溶冷却过程中所形成的单个高温y，相分裂而形成。进一步观察发现，分裂后的方形y’相颗粒在后续热处理过程中又发生了不稳定分解，在其颗粒内部有细小y＇相的重新析出，并且随着新析出y’相的长大原来的方形y’相颗粒逐渐消失。

英文摘要：

The microstructure of y＇ phase in HIPFGH95 superalloy was investigated by use of SEM and TEM. The results show that the microstructure is a mixture of recrystal grains and original dendrite crystals after the heat treatment. The undissolved particles of y＇ phase during the solution treatment distribute in the grain boundaries. Meanwhile, there are three different sizes of y＇ particles within the recrystal grains. Among them, the big and square y＇ particles exhibit arrays of every 8 particles, which are formed from the spired single y＇ particles precipitated during the cooling procedure from 1160℃. Moreover, which would decompose to form finer y＇ precipitates, at the same time, the cube y＇ particles disappear with the growth of finer y＇ precipitates.