摘要
在900-1150℃氧化的NiAl-28Cr-5.94Mo-0.05Hf-0.01Ho定向共晶合金,在其表面生成了连续的Al_2O_3氧化膜,具有良好的抗氧化性能。定向凝固工艺使合金的组织细化并提高了Cr(Mo)相中Al元素的含量,以及加入微量稀土元素Ho,都有利于生成Al_2O_3氧化膜。在NiAl-28Cr 5.94Mo-0.05Hf-0.01Ho定向共晶合金的氧化过程中表面氧化膜发生相变θ-Al_2O_3→α-Al_2O_3,导致其1000℃氧化质量增加出现反常。
The isothermal oxidation behavior of NiAI-28Cr-5.94Mo-0.05Hf-0.01Ho directional eutectic alloy in the temperature range of 900-1150℃was investigated.The results revealed that a continuous AI2O3 scale was formed and owned excellent oxidation resistance.Trace rare earth element Ho distributed uniformly at the alloy,together with refining structure and relatively high content of Al of Cr（Mo） phase by directional solidification（DS） process are beneficial to the formation of continuous Al_2O_3 coatings.During the oxidation of NiAI-28Cr-5.94Mo-0.05Hf-0.01Ho directional eutectic alloy,a phase transformation fromθ-AI_2O_3 toα-Al_2O_3 was found on the surface of oxidation film,and it resulted in the abnormal oxidation mass gaining when the alloy oxided at 1000℃.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2010年第6期585-591,共7页
Chinese Journal of Materials Research
关键词
金属材料
金属间化合物
NIAL
高温氧化
定向共晶合金
metallic materials
intermetallic compounds
NiAl
high temperature oxidation
directional eutectic alloy
