论文部分内容阅读
研究了微晶化对Ｆｅ３Ａｌ在１０００℃空气中氧化动力学的影响．发现微晶化后Ｆｅ３Ａｌ的氧化动力学与经典的抛物线规律存在明显的负偏差．分析认为，微晶化后氧化物形核率极大提高，氧化膜呈微晶态，氧化膜中的扩散由晶格扩散为主变为以晶界短路扩散为主，从而改变了氧化膜的生长动力学．根据Ｗａｇｎｅｒ高温氧化的基本理论，对微晶合金高温氧化动力学规律进行了探讨，导出其遵守四次方规律：ｘ４＝ｋｐｔ．
The effect of microcrystallization on the oxidation kinetics of Fe3Al in air at 1000 ℃ was studied. It is found that the oxidation kinetics of Fe3Al after microcrystallization has obvious negative deviation from the classical parabolic law. The analysis shows that the nucleation rate of the oxide increases greatly after microcrystallization and the oxide film is in a microcrystalline state. The diffusion in the oxide film mainly changes from the lattice diffusion to the grain boundary diffusion, which changes the oxide film Growth kinetics. According to the basic theory of Wagner high temperature oxidation, the oxidation kinetics of the microcrystalline alloy at high temperature was discussed, and the law of fourth order was derived: x4 = kpt.