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Exceptional Strain-Hardening Capacity of a Medium-Entropy Alloy CoCrNi With Grain-Size Gradient Structure

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Abstract

Surface mechanical attrition treatment (SMAT) was used to produce a surface layer with grain-size gradient along the thickness of spark-plasma-sintered medium-entropy alloy CoCrNi. In comparison with the spark-plasma-sintered fine-grained CoCrNi, the alloy after SMAT shows a 46 pct increase in yield strength and over three times higher strain-hardening rate (\(\frac{{\text{d}}\sigma }{{\text{d}}\varepsilon }\)). The ultimate tensile strength (σUTS) and the elongation (εf) reach 1420 MPa and 61.3 pct, respectively. The excellent strength-ductility synergy should be attributed to the Hall–Petch strengthening and the formation of high density of dislocations and nanotwins.

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Acknowledgements

This work was financially supported by the Shenzhen Fundamental Research Project (Grant No. JCJY20190809153205492) and National Natural Science Foundation of China (No. 52122102).

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, China

    Pengbo Wei, Kai Yan, Jiao Xu & Fuzeng Ren

  2. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

    Pengbo Wei

  3. Institute of Semiconductor Manufacturing Research, Shenzhen University, Shenzhen, 518060, Guangdong, China

    Jiao Xu

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Wei, P., Yan, K., Xu, J. et al. Exceptional Strain-Hardening Capacity of a Medium-Entropy Alloy CoCrNi With Grain-Size Gradient Structure. Metall Mater Trans A 54, 1332–1341 (2023). https://doi.org/10.1007/s11661-023-06988-z

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