(北京科技大学表面科学与腐蚀工程系,北京 100083;
西北工业大学材料科学与工程学院, 西安 710072)
摘 要: 应用高能量密度等离子体对Ni3Al进行微晶化处理,在合金表面获得了晶粒尺寸小于300 nm的微晶层。对比研究了Ni3Al微晶处理前后在氧气中1000 ℃高温氧化的行为和规律。发现微晶化处理后的试样氧化膜晶粒被极大地细化,合金中Al选择氧化得到促进,氧化速率明显降低, 氧化动力学服从四次方规律x4=kpt。
关键字: Ni3Al 微晶 高温氧化 腐蚀
(1 Department of Surface Science and Corrosion Engineering,
University of Science and Technology Beijing, Beijing 100083 , P. R. China
2 Department of Materials Science and Engineering,
?Northwestern Polytechnical University, Xi'an 710072, P. R. China)
Abstract:High energy density plasma (HEDP) technique was applied to surface treatment of Ni3Al. A micro-crystalline layer with grain sizes smaller than 300 nm was obtained. Isothermal oxidation at 1000 ℃ in oxygen for Ni3Al before and after micro-crystallizing was studied. The results showed that for the micro-crystalline Ni3Al, the grain of scale turns into very small, the selective oxidation of aluminium is promoted, the oxidation rate is decreased and the oxidation kinetics obeys the forth power equation: x4=kpt.
Key words: Ni3Al micro-crystalline high temperature oxidation corrosion