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A superfine eutectic microstructure and the mechanical properties of CoCrFeNiMox high-entropy alloys

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Abstract

A series of CoCrFeNiMox (x = 0.2, 0.4, 0.6, 0.8, 1.0, and 1.2) high-entropy alloys were designed to develop a eutectic high-entropy alloy system and to acquire a superfine eutectic structure. The results show that for the CoCrFeNiMox alloys, with the increase of Mo content from 0.2 to 1.2, the microstructures shift from a typical dendrite structure to a hypoeutectic microstructure (x = 0.6), and then to a fully eutectic microstructure (x = 0.8) with a lamellar spacing only 110 nm, and finally culminate in the hypereutectic structure (x = 1.0, x = 1.2). The XRD results show that CoCrFeNiMox alloys have a single FCC phase when x is 0.2 or 0.4. When Mo content is over 0.6, it begins to separate Cr9Mo21Ni20 intermetallic compounds. The hardness of the CoCrFeNiMox alloys is increasing significantly from 172.8 to 763.7 HV with the increase of Mo content. Meanwhile, the fracture strength increased but the ductility decreases. Among these alloys, the CoCrFeNiMo0.6 alloy shows excellent integrated mechanical properties of compressive fracture strength and strain, which are 2051 Mpa and 23%, respectively.

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ACKNOWLEDGMENTS

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. 51601086, 51405215, and 51702143), Liaoning Natural Science Foundation (Grant No. 2015020204), and Doctoral Initiating Project of Liaoning Province Foundation for Natural Sciences, China (Grant No. 201601342).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning, 121001, China

    Yong Guo, Liang Liu, Yue Zhang, Jingang Qi, Bing Wang, Zuofu Zhao, Jian Shang & Jun Xiang

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  1. Yong Guo
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  2. Liang Liu
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  3. Yue Zhang
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  4. Jingang Qi
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Correspondence to Liang Liu.

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Guo, Y., Liu, L., Zhang, Y. et al. A superfine eutectic microstructure and the mechanical properties of CoCrFeNiMox high-entropy alloys. Journal of Materials Research 33, 3258–3265 (2018). https://doi.org/10.1557/jmr.2018.177

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