The formation mechanisms of HfO2 located in different positions of oxide scales on ni-al alloys

被引：36
作者：
Cao, Xuezhen [1 ]
He, Jian [1 ,2 ,3 ]
Chen, Hao [4 ]
Zhou, Bangyang [1 ]
Liu, Liang [1 ]
Guo, Hongbo [1 ,2 ,3 ]
机构：
[1] Beihang Univ BUAA, Sch Mat Sci & Engn, 37 Xueyuan Rd, Beijing 100191, Peoples R China
[2] Beihang Univ BUAA, Res Inst Frontier Sci, 37 Xueyuan Rd, Beijing 100191, Peoples R China
[3] Beihang Univ BUAA, Minist Ind & Informat Technol, Key Lab High Temp Struct Mat & Coatings Technol, 37 Xueyuan Rd, Beijing 100191, Peoples R China
[4] Univ Nottingham Ningbo, Fac Sci & Engn, Dept Mech Mat & Mfg Engn, Ningbo 315100, Peoples R China
来源：
CORROSION SCIENCE | 2020年 / 167卷
基金：
北京市自然科学基金;
关键词：
Intermetallics; Rare earth elements; STEM; Oxidation; Segregation; CYCLIC OXIDATION BEHAVIOR; AL2O3; SCALES; COATINGS; SEGREGATION; DIFFUSION; GROWTH; RESISTANCE; ADHESION; VAPOR; DY;
D O I：
10.1016/j.corsci.2020.108481
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
HfO2 tends to grow on Hf-containing alloys during high-temperature oxidation and significantly affects the oxidation resistance. In this paper, cyclic oxidation behavior of single beta-phase Ni-49.9Al, gamma'-phase Ni-25Al and binary phase (gamma'+beta) Ni-33Al alloys doped with Hf was investigated at 1100 degrees C. HfO2 was located at different positions of the oxide scale grown on the above alloys. The HfO2 was distributed linearly within Al2O3 scale in Ni-49.9Al-0.1Hf whilst HfO2 primarily appeared along the spinel/Al2O3 interface in Ni-25Al-0.1Hf and Ni-33Al-0.1Hf. In addition, the specific distribution of HfO2 in Ni-33Al-0.1Hf was analyzed by HAADF-STEM and the corresponding formation mechanisms were proposed.
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页数：10
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