通过粉末冶金方法制备了Ni-20Cr-5Al和Ni-20Cr-5Al-0.2Y₂O₃（质量分数/%，下同）合金，将Ni-20Cr-5Al-0.2Y₂O₃合金在不同温度（500~1100℃）进行预氧化处理，然后将未预氧化及预氧化合金在1150℃下循环氧化15h，研究了Y₂O₃的添加和不同预氧化温度对合金抗高温循环氧化性能的影响。结果表明：添加0.2%Y₂O₃后提高了Ni-20Cr-5Al合金的抗高温循环氧化性能；预氧化可以有效提高Ni-20Cr-5Al-0.2Y₂O₃合金的抗高温循环氧化性能，其中预氧化温度为700℃的合金有最优的抗高温循环氧化性能，其原因是经过预氧化处理的合金表面形成了致密的保护性氧化膜，阻止了氧化的进一步进行。

Ni-20Cr-5Al and Ni-20Cr-5Al-0.2Y₂O₃ (mass fraction/%) alloys were prepared by powder metallurgic technology. The Ni-20Cr-5Al-0.2Y₂O₃ alloy was first pre-oxidized at different temperatures from 500 ℃ to 1 100 ℃, and then the un-oxidized and pre-oxidized alloys were cyclic oxidized at 1 150 ℃ for 15 h. The effects of Y₂O₃ and pre-oxidation temperature on the high-temperature cyclic oxidation resistance of the alloys were studied. The results show that the high-temperature cyclic oxidation resistance of Ni-20Cr-5Al alloy was improved with the addition of 0.2wt% Y₂O₃. The pre-oxidation can improve the high-temperature oxidation resistance of Ni-20Cr-5Al-0.2Y₂O₃ alloy effectively. Furthermore, when the pre-oxidation temperature was 700 ℃, the alloy achieved the best high-temperature cyclic oxidation resistance. The reason is that a dense protective oxide scale was formed on the surface of the alloy after pre-oxidation, which prevented the alloy from the further oxidation.