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Effect of rare earth element on the oxidation behavior of novel γ/γ′-strengthened Co–9Al–10W alloys

Published online by Cambridge University Press:  02 February 2017

Qiong Wang
Affiliation:
National Supervising & Testing Center for Engineering Composite Materials’ Quality, Jiangsu Provincial Supervising & Testing Research Institute for Products’ Quality, Nanjing 210007, People’s Republic of China
Qiang Yao*
Affiliation:
National Supervising & Testing Center for Engineering Composite Materials’ Quality, Jiangsu Provincial Supervising & Testing Research Institute for Products’ Quality, Nanjing 210007, People’s Republic of China
Jin-Zhu Song
Affiliation:
National Supervising & Testing Center for Engineering Composite Materials’ Quality, Jiangsu Provincial Supervising & Testing Research Institute for Products’ Quality, Nanjing 210007, People’s Republic of China
Yan Wang
Affiliation:
National Supervising & Testing Center for Engineering Composite Materials’ Quality, Jiangsu Provincial Supervising & Testing Research Institute for Products’ Quality, Nanjing 210007, People’s Republic of China
Yu-Hong Zhu
Affiliation:
National Supervising & Testing Center for Engineering Composite Materials’ Quality, Jiangsu Provincial Supervising & Testing Research Institute for Products’ Quality, Nanjing 210007, People’s Republic of China
Tong Lu
Affiliation:
National Supervising & Testing Center for Engineering Composite Materials’ Quality, Jiangsu Provincial Supervising & Testing Research Institute for Products’ Quality, Nanjing 210007, People’s Republic of China
Bao-Jun Han
Affiliation:
School of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: yaoqiangjszj@gmail.com
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Abstract

A series of oxidation experiments were carried out on these novel γ/γ′-strengthened cobalt-based alloys of the systems Co–9Al–10W and Co–9Al–10W–0.02X (X = La, Ce, Dy, Y) at 900 °C. The appropriate amounts’ addition of rare earth elements leads to improved oxidation properties at 900 °C, especially La elements show the best oxidation resistance (129.008 mg/cm2). However, the base Co–9Al–10W alloy shows the worst oxidation performance (151.544 mg/cm2). Multilayer oxide layers formed during the oxidation process, the outer were mainly CoO and Co3O4 oxides, and the middle layer contained complex oxides (containing Co, Al, and W). The inner layer consists of little discontinuous oxides, included few Al2O3 oxides. There existed a different crack width and the base alloy had the widest crack. Moreover, there exists a phase transformation (γ/γ′ to γ/Co3W) at the interface between oxide film and substrate.

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Articles
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Mathias Göken

References

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