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Heterogeneous Structure Design to Strengthen Carbon-Containing CoCrFeNi High Entropy Alloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

A carbon-containing CoCrFeNi high entropy alloy (HEA) with heterogeneous structures was obtained through thermomechanical treatments, which induced concurrent recrystallization and carbide precipitation in the alloy. A combination of high yield strength (556 MPa) and large uniform elongation (45%) was achieved in the investigated alloy. The enhancement of the strength is attributed to the combined effects of grain refinement, precipitation strengthening and microstructural heterogeneity. Our work demonstrated that the heterogeneity design could be realized by thermomechanical processes, which provided a practical strategy for producing HEAs with high performance.

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Acknowledgements

This work was financially supported by a City University of Hong Kong Strategic Research Grant (Project No. 7005238). The authors thank Dr. HaoJie Kong and Mr. Tzu Hsiu Chou, City University of Hong Kong, for their help in this research.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, SAR 999077, China

    **aomeng Qin & Chan Hung Shek

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  1. **aomeng Qin
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  2. Chan Hung Shek
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Correspondence to Chan Hung Shek.

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Available online at http://springer.longhoe.net/journal/40195.

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Qin, X., Shek, C.H. Heterogeneous Structure Design to Strengthen Carbon-Containing CoCrFeNi High Entropy Alloy. Acta Metall. Sin. (Engl. Lett.) 34, 1503–1510 (2021). https://doi.org/10.1007/s40195-021-01268-4

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  • DOI: https://doi.org/10.1007/s40195-021-01268-4

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