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Microstructure and Mechanical Properties of a New Refractory Equiatomic CrHfNbTaTi High-Entropy Alloy

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Abstract

A novel refractory CrHfNbTaTi high-entropy alloy, derived by replacement of Zr by Cr in HfNbTaTiZr, has been prepared by vacuum arc-melting. Its phase components, microstructure, and compressive properties at room temperature in as-cast and as-homogenized condition were investigated. The results show that the phase structure of CrHfNbTaTi changes from the single body-centered cubic (BCC) phase of HfNbTaTiZr alloy to multiple phases, composed of one face-centered cubic (FCC) and two BCC phases. Additionally, the yield strength of the alloy significantly increases from 926 MPa to 1258 MPa and 1366 MPa in the as-cast and as-homogenized state, respectively, while promising ductility of ~ 24.3% elongation is retained in the as-cast state. The morphology and composition of the network-shaped interdendritic regions are considered to be closely related to the change of the mechanical properties induced by elemental substitution and homogenization treatment.

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Acknowledgements

Financial support from the National Natural Science Foundation of China (Grant No. 51604173), Natural Science Foundation of Jiangsu Province of China (Grants No. BK20181047), Natural Science Research of Jiangsu Higher Education Institutions of China (Grants No. 18KJB430012), and Shanghai Jiao Tong University Research Fund Program for Young Scholars is gratefully acknowledged.

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Authors and Affiliations

  1. School of Mechanical Engineering, Jiangsu University of Technology, Changzhou, 213001, People’s Republic of China

    Jiaojiao Yi & Mingqin Xu

  2. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, People’s Republic of China

    Song Tang

  3. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, 211167, People’s Republic of China

    Chao Zhang

  4. School of Materials Science and Engineering, Jiangsu University of Technology, Changzhou, 213001, People’s Republic of China

    Lin Yang & Lu Wang

  5. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

    Long Zeng

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  1. Jiaojiao Yi
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  2. Song Tang
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  3. Chao Zhang
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  6. Lu Wang
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  7. Long Zeng
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Correspondence to Mingqin Xu.

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Yi, J., Tang, S., Zhang, C. et al. Microstructure and Mechanical Properties of a New Refractory Equiatomic CrHfNbTaTi High-Entropy Alloy. JOM 73, 934–940 (2021). https://doi.org/10.1007/s11837-020-04557-y

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  • DOI: https://doi.org/10.1007/s11837-020-04557-y

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