The role of Cr and Si in affecting high-temperature oxidation behaviour of minor Dy doped NiAl alloys

被引：40
作者：
He, Jian [1 ,2 ]
Luan, Yang [3 ]
Guo, Hongbo [1 ,2 ]
Peng, Hui [1 ,2 ]
Zhang, Yanli [1 ,2 ]
Zhang, Tian [1 ,2 ]
Gong, Shengkai [1 ,2 ]
机构：
[1] Beihang Univ BUAA, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
[2] Beihang Univ BUAA, Beijing Key Lab Adv Funct Mat & Thin Film Technol, Beijing 100191, Peoples R China
[3] Liaoning Univ Int Business & Econ, Liaoning, Peoples R China
来源：
CORROSION SCIENCE | 2013年 / 77卷
关键词：
Intermetallics; Rare earth element; Thermal cycling; Interface; Oxidation; Segregation; REACTIVE ELEMENT DOPANTS; CYCLIC-OXIDATION; MECHANICAL-PROPERTIES; COATING SYSTEM; PORE FORMATION; AL ALLOY; RESISTANCE; SEGREGATION; INTERFACES; ADDITIONS;
D O I：
10.1016/j.corsci.2013.08.020
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Isothermal and cyclic oxidation behaviour of Cr/Si co-doped NiAlDy alloys were investigated at 1200 degrees C. The role of Cr and Si in oxidation of NiAlDy alloys was discussed by combining experimental results and first-principles calculations. Cr and Si would co-segregate at grain boundaries and promoted the transformation from theta-Al2O3 to alpha-Al2O3 at initial oxidation stage. The NiAlDyCr-3 Si alloy yielded a mass gain of similar to 0.64 mg/cm(2) after 100 h isothermal oxidation and showed much improved cyclic oxidation resistance due to the pair affinity between Si and Cr which can alleviate the deleterious effect of interfacial Cr precipitation. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：322 / 333
页数：12
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