Oxidation mechanism of three Fe-Al alloys with and without addition of 0.1 at% yttrium at 800℃  

作　　者：Xunhu Xu Hua Wei Junhuai Xiang Ling Wang Mingfeng Liu Honghua Zhang Dandan Men Jiangshan An 

机构地区：[1]Jiangxi Key Laboratory of Surface Engineering,Jiangxi Science and Technology Normal University,Nanchang,330038,China [2]Center for Hypergravity Experimental and Interdisciplinary Research,Zhejiang University,Hangzhou.310058,China

出　　处：《Journal of Rare Earths》2020年第10期1126-1130,I0004,共6页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (51701054);the Science and Technology Research Program of Jiangxi Provincial Education Department of China (GJJ160770)。

摘　　要：The isothermal oxidation behavior of Fe-10 Al,Fe-15 Al,Fe-20 Al alloys with and without the addition of0.1 at% Y was studied at 800℃ under 1×105 Pa of flowing pure O2 for 24 h.The oxidation of three Fe-Al alloys can be divided into transient state and steady state oxidation stages.The oxidation of each stage is approximately in accordance with the parabolic law.The addition of 0.1 at% Y changes the oxidation behavior obviously and leads to a significant increase of the weight gain of Fe-10 Al and Fe-15 Al.The scale grown on Fe-10 Al is much thicker and more complicated than that grown on Fe-20 Al,which is composed of an exclusive thin layer of Al2 O3 protective film.Due to the formation of a large number of nodules,the scales grown on Fe-15 AI cannot provide full protection for the alloy.Scale micro structure of the three Fe-Al-0.1 Y alloys is similar to their corresponding Fe-Al alloys.However,nodules with very small size still appear on the surface of Fe-20 Al-0.1 Y alloy.The critical Al concentration to form an exclusive Al2 O3 protective layer for Fe-Al binary alloy is on the borderline between 15 at%-20 at%.For Fe-Al-0.1 Y alloy,the presence of 20 at% Al is not enough to inhibit the growth of nodules.

关 键 词：Fe-Al alloy Isothermal temperature oxidation Nodular oxide Rare earth effect 

分 类 号：TG132.3[一般工业技术—材料科学与工程]