Enhanced alumina film adhesion of Hf/Y-doped iron-aluminum alloys during high-temperature oxidation:a new observation

作     者：Dong-Qing Li Li-Xian Zhou Jun Zhan Jing-Chao Wang Jian Gu Jia-Jun Si 

作者机构：Department of Transmission and Transformation Engineering MechanicsChina Electric Power Research Institute 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2019年第38卷第9期

页      面：877-884页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the Basic Research Program of State Grid(No.GCB17201600179) 

主　　题：Intermetallics Reactive elements Thermal cycling Alumina film Interfacial adhesion Segregation 

摘      要：The cyclic oxidation behavior of Hf/Y-doped B2 FeAl intermetallics at 1373 K was *** an undoped FeAl alloy,premature spallation of the alumina film occurs due to the formation of numerous voids at the film/alloy interface and apparent shrinkage in the *** contrast to this,doping with either Hf or Y significantly improves the interfacial adhesion between the alumina film and the alloy substrate,particularly with *** observation in combination with Anger electron spectroscopic analysis suggests that in addition to prohibiting interfacial void formation and alleviating film shrinkage,the addition of Hf in the FeAl alloy could consolidate the film/alloy interface by directly participating in chemical bonding across the interface as a Hf *** causes the spallation of alumina film from the equiaxed grains/columnar grains interface rather than the bottom of the film.