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Improvement of Microstructure and Mechanical Properties of CoCrCuFeNi High-Entropy Alloys By V Addition

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Abstract

V element had positive effect in improving the strength of many alloys, so it was possible that V had potential to strengthen CoCrCuFeNi high-entropy alloys (HEAs) with face-centered cubic (FCC) crystal structure, which was relatively weak in strength and had outstanding ductility. In this paper, we studied the alloying effect of V on the phase evolution, microstructure and the mechanical properties of the (CoCrCuFeNi)100−xVx (x = 0-16, atomic ratio, hereafter in at.%) HEAs systematically. The results showed that V element had capacity to induce sigma phase precipitation. The volume fraction of sigma phase increased from 0 to 12%; the compressive yield stress of (CoCrCuFeNi)100−xVx HEAs increased from 300 to 613 MPa with V content increasing from 0 to 16% (atomic ratio, hereafter in at.%). However, the compression fracture strain decreased from 50 to 28%. V addition was beneficial in improving the strength of CoCrCuFeNi HEA, and the increase in sigma phase volume fraction was the key factor for the improvement of the (CoCrCuFeNi)100−xVx HEAs in yield stress.

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Acknowledgment

This work was supported by the Fund of State Key Laboratory of Advanced Welding and Joining and National Key Research and Development Program of China (2017YFA0403804).

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Authors and Affiliations

  1. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, China

    Gang Qin, Shu Wang, Ruirun Chen, Huiting Zheng, Liang Wang, Yanqing Su, Jingjie Guo & Hengzhi Fu

  2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China

    Ruirun Chen

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  1. Gang Qin
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Qin, G., Wang, S., Chen, R. et al. Improvement of Microstructure and Mechanical Properties of CoCrCuFeNi High-Entropy Alloys By V Addition. J. of Materi Eng and Perform 28, 1049–1056 (2019). https://doi.org/10.1007/s11665-018-3837-1

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