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Alloying effects on the microstructure and properties of CoCrFeMnNiX0.1 high-entropy alloys via rolling and thermal treatment

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Abstract

This study fabricated four kinds of CoCrMnFeNiX0.1 (X = Al, Cu, Mo, Ti) high-entropy alloys through rolling with subsequent thermal treatment, to investigate the alloying effects on the microstructural evolution, mechanical properties, and electrochemical corrosion performance. High-density parallel twinning bands were observed in the as-rolled CoCrMnFeNiX0.1 alloys, excluding the Cu0.1 variant, signifying that plastic deformation was dominated by twinning. However, detwinning and thickening of twin layers was observed after annealing. This effect was more pronounced in the rolling direction-normal direction (RD-ND) plane due to the stress state induced by rolling. The introduction of Cu altered the deformation mechanism to a combination of twinning and slipping, resulting in fewer twinning bands. Notably, annealing induced the formation of abundant bamboo-shaped twinning bands (width: ~ 10 nm) in the Cu0.1 alloy, which were correlated with nano precipitated particles. Additionally, the incorporation of Mo or Al elements activated more twinning directions, thereby enhancing plasticity. For the Ti0.1 alloy, the primary factors influencing the altered tensile and electrochemical performances were the formation and growth of few precipitated particles during annealing. Consequently, the strengthening effect can be ranked in the order of Mo > Ti > Al > Cu. Therefore, the addition of Al and Ti is recommended for improving the anticorrosive property and thermal stability of recrystallized grains.

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No new data were created or analyzed in this study. Data will be available to readers from the corresponding author upon reasonable request.

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Acknowledgements

The authors would like to acknowledge the financial support of the National Natural Science Foundation of China (No. 51801072, 51805219), and China Postdoctoral Science Foundation (2019TQ0126).

Funding

Innovative Research Group Project of the National Natural Science Foundation of China (No. 51801072, 51805219), China Postdoctoral Science Foundation (2019TQ0126).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China

    Lingling Tang, Yang Zhou & Siyuan Wang

  2. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    Ningning Liang & Peng Cui

  3. Automotive Engineering Research Institute, Jiangsu University, Zhenjiang, 212013, China

    Nan Wang

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Contributions

LT contributed to conceptualization, provided methodology, funding acquisition, supervision, writing review and editing. YZ wrote the original manuscript, carried out SEM and TEM observations and analyses, performed polarization curve tests and annealing treatment. SW performed tensile experiments and edited the manuscript. NL was contributed to resources, supervision and data analysis. PC performed rolling experiment and data analysis. NW provided resources and funding acquisition, supervised and edited the manuscript. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Lingling Tang or Nan Wang.

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Tang, L., Zhou, Y., Wang, S. et al. Alloying effects on the microstructure and properties of CoCrFeMnNiX0.1 high-entropy alloys via rolling and thermal treatment. J Mater Sci 59, 7529–7546 (2024). https://doi.org/10.1007/s10853-024-09639-9

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