测量了γ－辐照对ＧＨ３３Ａ镍基高温合金蠕变性能影响的蠕变曲线、正电子寿命谱和Ｄｏｐｐｌｅｒ展宽谱。结果表明：无镁样品辐照后，塑性提高３８．１％，断裂寿命不变，而含镁（０．００４５％）样品辐照后，断裂寿命和塑性均下降；辐照的无镁样品经负蠕变后加载，断裂寿命增加９．４％，塑性下降２５．６％；辐照的长期时效含镁（０．００５４％）样品经负蠕变后再加载，断裂寿命显著增加（４８．３％），同时塑性保持不变。 The creep curves, positron lifetime spectra and Doppler broadening spectrum of γ-irradiation on the creep properties of GH33A nickel-base superalloy were measured. The results show that after the irradiation of magnesium-free sample, the plasticity increases by 38.1% and the rupture life remains unchanged. However, the fracture life and plasticity of samples containing magnesium (0.0045%) decrease after irradiation. After negative creep loading, the fracture life increased by 9.4% and the plasticity decreased by 25.6%. The irradiated long-term magnesium (0.0054%) sample was loaded by negative creep and the fracture life was significantly increased (48%). 3%), while the plastic remains unchanged.