摘要
对EB—PVD制备微晶Ni-11．5Cr-4．5Co-0．5Al合金薄板在800℃空气中氧化行为进行研究，采用SEM对氧化试样的表面和截面形貌进行研究，小角XRD和EDAX对其相和成分分布进行分析。氧化物主要由NiO，Ni（Al，Cr）2O4和Cr2O3组成，在长时间氧化后在氧化物和基体界面出现Al2O3内氧化层；细晶Ni-11．5Cr-4．5Co-0．5Al合金氧化动力学符合立方规律而非抛物线规律；与粗晶材料相比，细晶材料氧化产物晶粒细小，其高密度的晶界成为短路扩散的途径。
The isothermal oxidation behavior of microcrystalline Ni-11.5Cr-4.5Co-0.5Al superalloy sheet fabricated by Electron Beam Physical Vapor Deposition （EB-PVD） at 800℃ in air was investigated in this paper. Surfaces and cross-sections of the oxidized specimens were studied by scanning electron microscopy （SEM）. Phase identification of the oxide scale was performed by glancing angle X-ray diffraction （GAXRD） and Energy Dispersive Analysis of X-rays （EDAX）. The oxide scales consisted mainly of an outer NiO, NiCr2O4 and Cr2O3 mixed oxides, and inner, Al2O3. The oxidation kinetics of microcrystalline Ni-11.5Cr-4.5Co-0.5Al superalloy sheet obeyed cubical power law, not parabolic power law. The oxide grains were much smaller on microcrystalline Ni-11.5Cr-4.5Co-0.5Al superalloy thereby higher density of grain boundary acted as the routes of the short circuit diffusion could be existed in the oxide scale than that that on coarse crystalline alloy.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第A10期3749-3752,共4页
Journal of Functional Materials
