微晶Fe_3Al高温氧化动力学研究  

Oxidation Kinetics of Microcrystalline Fe 3Al

作　　者：王永刚[1,2] 何业东[1,2] 朱日彰[1,2] 

机构地区：[1]中国民航学院 [2]北京科技大学

出　　处：《应用科学学报》1999年第1期119-121,共3页Journal of Applied Sciences

基　　金：国家自然科学基金;中国有色金属总公司博士后科学基金;冶金部腐蚀磨蚀与表面科学开放实验室资助

摘　　要：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 oxidation Kinetics of microcrystalline Fe 3Al was compared with that of normal grain Fe 3Al at 1000°C in air. It was shown that the oxidation rate of microcrystalline Fe 3Al was heavily decreased. The oxidation kinetics of microcrystalline Fe 3Al failed to obey the parabolic law. It was suggested that the oxide scale turned into microcrystalline state since the nuclear probability of oxide was extremely increased. The short circuit diffusion through oxide scale was dominant. An expression, x 4=k pt, has been derived for the oxidation kinetics of microcrystalline Fe 3Al based upon the model of short circuit diffusion.

关 键 词：FE3AL 动力学 微晶 氧化 高温 铁铝合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程] O753.1[金属学及工艺—金属材料]