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

Xuezhen Cao; Jian He; Hao Chen; Bangyang Zhou; Liang Liu; Hongbo Guo

doi:10.1016/j.corsci.2020.108481

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

Xuezhen Cao, Jian He, Hao Chen, Bangyang Zhou, Liang Liu, Hongbo Guo

Department of Mechanical, Materials and Manufacturing Engineering

Research output: Journal Publication › Article › peer-review

32 Citations (Scopus)

Abstract

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 β-phase Ni-49.9Al, γ’-phase Ni-25Al and binary phase (γ’+β) Ni-33Al alloys doped with Hf was investigated at 1100 °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.

Original language	English
Article number	108481
Journal	Corrosion Science
Volume	167
DOIs	https://doi.org/10.1016/j.corsci.2020.108481
Publication status	Published - 1 May 2020

Keywords

A. Intermetallics
A. Rare earth elements
B. STEM
C. Oxidation
C. Segregation

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Materials Science

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10.1016/j.corsci.2020.108481

Cite this

@article{021b3dcc58114839954b1b4d6ae04ec3,

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

abstract = "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 β-phase Ni-49.9Al, γ{\textquoteright}-phase Ni-25Al and binary phase (γ{\textquoteright}+β) Ni-33Al alloys doped with Hf was investigated at 1100 °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.",

keywords = "A. Intermetallics, A. Rare earth elements, B. STEM, C. Oxidation, C. Segregation",

author = "Xuezhen Cao and Jian He and Hao Chen and Bangyang Zhou and Liang Liu and Hongbo Guo",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

year = "2020",

month = may,

day = "1",

doi = "10.1016/j.corsci.2020.108481",

language = "English",

volume = "167",

journal = "Corrosion Science",

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T1 - The formation mechanisms of HfO2 located in different positions of oxide scales on ni-al alloys

AU - Cao, Xuezhen

AU - He, Jian

AU - Chen, Hao

AU - Zhou, Bangyang

AU - Liu, Liang

AU - Guo, Hongbo

PY - 2020/5/1

Y1 - 2020/5/1

N2 - 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 β-phase Ni-49.9Al, γ’-phase Ni-25Al and binary phase (γ’+β) Ni-33Al alloys doped with Hf was investigated at 1100 °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.

AB - 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 β-phase Ni-49.9Al, γ’-phase Ni-25Al and binary phase (γ’+β) Ni-33Al alloys doped with Hf was investigated at 1100 °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.

KW - A. Intermetallics

KW - A. Rare earth elements

KW - B. STEM

KW - C. Oxidation

KW - C. Segregation

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