Effect of co-doping of two reactive elements on alumina scale growth of β-NiAl at 1200°C

被引：92
作者：
Guo, Hongbo [1 ]
Li, Dongqing
Zheng, Lei
Gong, Shengkai
Xu, Huibin
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
来源：
CORROSION SCIENCE | 2014年 / 88卷
关键词：
Intermetallics; Rare earth elements; Thermal cycling; Interfaces; Oxidation; Segregation; HIGH-TEMPERATURE OXIDATION; GRAIN-BOUNDARY SEGREGATION; THERMAL BARRIER COATINGS; CYCLIC OXIDATION; BOND COAT; BEHAVIOR; OXIDE; RESISTANCE; ADHESION; PERFORMANCE;
D O I：
10.1016/j.corsci.2014.07.036
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure and cyclic oxidation behaviour of beta-NiAl alloys doped with two reactive elements (REs) were investigated. Hf and Zr as well as Y and La co-precipitated into one phase during alloy preparation, while Dy and Hf as well as Hf and La precipitated alone into different phases. All the co-doped alloys exhibited reduced oxidation rate as compared to the RE-free alloy. The Hf and Zr, Y and La co-doping even led to lower oxidation rate than the corresponding single-doping. The synergistic effect associated with co-segregation of RE ions on alumina scale growth rate was discussed. (C) 2014 Elsevier Ltd. All rights reserved.
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页码：197 / 208
页数：12
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