Oxidation behavior of CoCrFeMnNi high entropy alloy after plastic deformation

•Increasing plastic deformation degree will reduce the overall oxidation degree of HEA specimens.•Deformed HEA specimens experience oxidation mechanism transformation during oxidation.•Oxidation mechanism transformation is attributed to the recrystallization process.•Severe plastic deformation degre...

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Bibliographic Details
Published in:Corrosion science 2020-02, Vol.163, p.108285, Article 108285
Main Authors: Wang, Ying, Zhang, Mao, Jin, Junsong, Gong, Pan, Wang, Xinyun
Format: Article
Language:English
Subjects:
Grain boundaries
High entropy alloy
High entropy alloys
Multi-stage parabolic rate law
Oxidation
Oxidation kinetics
Plastic deformation
Reaction kinetics
Recrystallization
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Summary:•Increasing plastic deformation degree will reduce the overall oxidation degree of HEA specimens.•Deformed HEA specimens experience oxidation mechanism transformation during oxidation.•Oxidation mechanism transformation is attributed to the recrystallization process.•Severe plastic deformation degree can introduce significant internal oxidation in the HEA. Oxidation kinetics of the plastically deformed CoCrFeMnNihigh entropy alloy (HEA) conforms to the multi-stage parabolic rate law, and the oxidation kinetics transition is triggered by the recrystallization. Since plastic deformation introduces abundant dislocations and vacancies, the oxidation initial rate gradually rises with increasing plastic deformation degree. As the oxidation process progresses, the deformed specmiens experience recrystallization, and specimens with larger plastic deformation degree form richer grain boundaries, which promotes the intergranular oxidation of Cr to form internal scales. The Cr-riched internal scales can effectively hinder the further oxidation and correspondingly reduce the overall oxidation degree of plastically deformed HEA specimens.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2019.108285