On the preferential grain boundary oxidation of a Ni-Co-based superalloy

Jiang Ju; Zhao Shen; Maodong Kang; Jianqiang Zhang; Jun Wang

doi:10.1016/j.corsci.2022.110203

On the preferential grain boundary oxidation of a Ni-Co-based superalloy

Jiang Ju, Zhao Shen, Maodong Kang, Jianqiang Zhang, Jun Wang

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

Abstract

The microstructure and microchemistry of the oxide scale formed on a Ni-Co-based superalloy after oxidation at 900 °C in air for 100 h were investigated by multiscale characterization techniques. Results show that a continuous surface oxide scale forms, together with internal oxides preferentially along the grain boundaries. TEM and TKD analysis reveals that the grain boundary oxides are mainly composed of equiaxed nano-sized Al₂Ti₇O₁₅. A large number of plane defects are observed in Al₂Ti₇O₁₅, which could work as fast-diffusion paths for the inward diffusion of oxygen, contributing to the preferential grain boundary oxidation.

Original language	English
Article number	110203
Journal	Corrosion Science
Volume	199
DOIs	https://doi.org/10.1016/j.corsci.2022.110203
State	Published - 1 May 2022
Externally published	Yes

Keywords

Ni-Co-base superalloy
On-axis TKD
Oxidation
Plane defects
Transmission electron microscopy

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10.1016/j.corsci.2022.110203

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title = "On the preferential grain boundary oxidation of a Ni-Co-based superalloy",

abstract = "The microstructure and microchemistry of the oxide scale formed on a Ni-Co-based superalloy after oxidation at 900 °C in air for 100 h were investigated by multiscale characterization techniques. Results show that a continuous surface oxide scale forms, together with internal oxides preferentially along the grain boundaries. TEM and TKD analysis reveals that the grain boundary oxides are mainly composed of equiaxed nano-sized Al2Ti7O15. A large number of plane defects are observed in Al2Ti7O15, which could work as fast-diffusion paths for the inward diffusion of oxygen, contributing to the preferential grain boundary oxidation.",

keywords = "Ni-Co-base superalloy, On-axis TKD, Oxidation, Plane defects, Transmission electron microscopy",

author = "Jiang Ju and Zhao Shen and Maodong Kang and Jianqiang Zhang and Jun Wang",

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doi = "10.1016/j.corsci.2022.110203",

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T1 - On the preferential grain boundary oxidation of a Ni-Co-based superalloy

AU - Ju, Jiang

AU - Shen, Zhao

AU - Kang, Maodong

AU - Zhang, Jianqiang

AU - Wang, Jun

PY - 2022/5/1

Y1 - 2022/5/1

N2 - The microstructure and microchemistry of the oxide scale formed on a Ni-Co-based superalloy after oxidation at 900 °C in air for 100 h were investigated by multiscale characterization techniques. Results show that a continuous surface oxide scale forms, together with internal oxides preferentially along the grain boundaries. TEM and TKD analysis reveals that the grain boundary oxides are mainly composed of equiaxed nano-sized Al2Ti7O15. A large number of plane defects are observed in Al2Ti7O15, which could work as fast-diffusion paths for the inward diffusion of oxygen, contributing to the preferential grain boundary oxidation.

AB - The microstructure and microchemistry of the oxide scale formed on a Ni-Co-based superalloy after oxidation at 900 °C in air for 100 h were investigated by multiscale characterization techniques. Results show that a continuous surface oxide scale forms, together with internal oxides preferentially along the grain boundaries. TEM and TKD analysis reveals that the grain boundary oxides are mainly composed of equiaxed nano-sized Al2Ti7O15. A large number of plane defects are observed in Al2Ti7O15, which could work as fast-diffusion paths for the inward diffusion of oxygen, contributing to the preferential grain boundary oxidation.

KW - Ni-Co-base superalloy

KW - On-axis TKD

KW - Oxidation

KW - Plane defects

KW - Transmission electron microscopy

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DO - 10.1016/j.corsci.2022.110203

M3 - 文章

AN - SCOPUS:85125504285

SN - 0010-938X

VL - 199

JO - Corrosion Science

JF - Corrosion Science

M1 - 110203

ER -

On the preferential grain boundary oxidation of a Ni-Co-based superalloy

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Keywords

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