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Microstructure, phase composition and wear resistance of low valence electron concentration AlxCoCrFeNiSi high-entropy alloys prepared by vacuum arc melting

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Abstract

The low valence electron concentration (VEC) AlxCoCrFeNiSi (x = 0.5, 1.0, 1.5 and 2.0) high-entropy alloys (HEAs) were designed by the fundamental properties of the constituent elements and prepared by vacuum arc melting method. The effects of Al addition on the crystal structure and microstructure were investigated. The microhardness and wear property were also researched. The results showed that the microstructure transformed from dendritic crystal to equiaxed crystal. It was found that FCC phase gradually decreased with the increasing Al content and disappeared until in a composition of 1.0 in AlxCoCrFeNiSi HEAs. Little FCC phase was found with continuously adding Al, while the phase fraction of BCC increased from 85.0% to 91.8%, and VEC decreased from 7.00 to 6.14. The microhardness was increased gradually from 598 up to 909 HV with addition of Al from 0.5 to 2.0. It was the same of the compressive strength results, which improved from 1200 to 1920 MPa. The wear coefficient and mass loss were in line with mechanical properties evolution, which was attributed to the microstructure transformation into equiaxed crystal and the increase in BCC phase.

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Acknowledgements

This work was financially supported by the Natural Science Foundation of Liaoning Province (No. 2019-MS-247) and the Liaoning Revitalization Talents Program (XLYC1807178).

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Authors and Affiliations

  1. Department of Material Science and Engineering, Shenyang University of Technology, Shenyang, 110870, Liaoning, China

    Bing-qian Jin, Nan-nan Zhang, Yue Zhang & De-yuan Li

  2. Provincial Key Laboratory of Advanced Welding Technology and Automation, Shenyang, 110870, Liaoning, China

    Bing-qian Jin, Nan-nan Zhang, Yue Zhang & De-yuan Li

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  1. Bing-qian Jin
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  2. Nan-nan Zhang
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  4. De-yuan Li
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Correspondence to Nan-nan Zhang.

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Jin, Bq., Zhang, Nn., Zhang, Y. et al. Microstructure, phase composition and wear resistance of low valence electron concentration AlxCoCrFeNiSi high-entropy alloys prepared by vacuum arc melting. J. Iron Steel Res. Int. 28, 181–189 (2021). https://doi.org/10.1007/s42243-020-00398-w

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  • DOI: https://doi.org/10.1007/s42243-020-00398-w

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