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Effects of Ni and Cr on the high-temperature oxidation behavior and mechanisms of Co- and CoNi-base superalloys

  • The high-temperature oxidation behaviors of Co- and CoNi-base alloys with different Ni and Cr additions were investigated by isothermal oxidation in air at 900 and 1000 °C. The structure, composition, and element distribution in the three layers within the oxide scales in different alloys have been explored in detail by electron microscopy, especially with regard to the fine oxide particles in the intermediate layer. Based on the microstructure and phase constitution of the oxide scales, the synergetic effects of alloying elements on the oxidation mechanisms and resistance have been elucidated in detail with the aid of CALPHAD calculation.

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Author: Longjun Li, Li Wang, Zhida Liang, Junyang He, Jingwen Qiu, Florian Pyczak, Min Song
DOI:https://doi.org/10.1016/j.matdes.2022.111291
ISSN:1873-4197
Title of the source (English):Materials and Design
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2022
Volume/Year:224
Article number:111291
Way of publication:Open Access
Faculty/Chair:Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Mikrostrukturelles Werkstoffdesign
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