采用X射线衍射(XRD)方法测算镍基粉末冶金高温合金FGH97中γ和γ′相的晶格常数,计算出γ/γ′晶格错配度。结果表明:γ′相的晶格常数比γ相的小,错配度为负值。Hf 主要存在于γ′相中,随着合金中 Hf 加入量的增加,进入γ′相中 Hf 的数量增加,使γ′相的晶格常数逐渐增大,错配度的绝对值逐渐减小。 The lattice parameters of γ and γ ’phases in Ni-based superalloy FGH97 were measured by X-ray diffraction (XRD), and the γ / γ’ lattice mismatch degree was calculated. The results show that the lattice constant of γ ’phase is smaller than that of γ phase, and the mismatch degree is negative. Hf is mainly present in the γ ’phase. With the increase of Hf content in the alloy, the amount of Hf entering the γ’ phase increases, so that the lattice constant of the γ ’phase gradually increases, and the absolute value of the mismatch gradually decreases .