Effects of Dy on cyclic oxidation resistance of NiAl alloy

被引：30
作者：
Guo Hong-bo [1 ,2 ]
Wang Xiao-yan [1 ,2 ]
Li Ji [3 ]
Wang Shi-xing [1 ,2 ]
Gong Sheng-kai [1 ,2 ]
机构：
[1] Beijing Univ Aeronaut & Astronaut, Dept Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Beijing Univ Aeronaut & Astronaut, Beijing Key Lab Adv Funct Mat & Thin Film Technol, Beijing 100083, Peoples R China
[3] Shenyang Liming Aero Engine Grp Corp, Shenyang 110043, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2009年 / 19卷 / 05期
基金：
中国国家自然科学基金;
关键词：
NiAl; reactive element; dysprosium(Dy); oxidation; adhesion; THERMAL BARRIER COATINGS; HIGH-TEMPERATURE; SCALE ADHESION; GROWN OXIDE; BOND COAT; BEHAVIOR; SULFUR; PERFORMANCE; HAFNIUM;
D O I：
10.1016/S1003-6326(08)60426-4
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The NiAl alloys modified by reactive element(R-E), dysprosium(Dy), were produced by arc melting. The microstructures of the modified alloys were investigated by field emission-scanning electron microscope(FE-SEM) equipped with energy dispersive spectroscope(EDS) and back scatter detector. Cyclic oxidation tests at 1 200 degrees C were conducted to assess the cyclic oxidation performance of the alloys. The Dy dopant prevents the surface rumpling of the oxide scale and the formation of cavities beneath the oxide scale. The pegs consisting of Dy-rich oxide inclusion core and an outer alumina sheath develop deeply in the alloy and improve the oxide scale adhesion. 0.05%-0.1% (molar fraction) Dy dramatically improves the cyclic oxidation resistance of the NiAl alloy. Too high concentration of Dy is deleterious because of the fast oxidation rate caused by severe internal oxidation.
引用
收藏
页码：1185 / 1189
页数：5
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