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Effect of Cr Incorporation on the Mechanical Properties of HfMoTiZrCr, HfMoNbZrCr, and HfMoNbTiCr Refractory High-Entropy Alloys

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Abstract

Cr was used to replace Nb, Ti, and Zr in a precursor alloy HfMoNbTiZr, and its effect on the microstructure, phase constitution, and mechanical properties of the newly formed alloys were investigated. Microstructural evolutions revealed that a cubic Laves phase emerged regardless of which element was substituted by Cr. The original single-phase BCC structure of the precursor alloy was thus deteriorated and replaced by two BCC and one cubic Laves phases. The formation of the Laves phase and BCC phases increased the strength to 2480 ± 40 MPa in the HfMoNbTiCr alloy, while the net-like structure (Laves phase) impeded the crack extension and compensated for the decreased plasticity due to the introduction of the brittle-stiff Laves phase. The other two alloys, HfMoTiZrCr and HfMoNbZrCr, possessed lower strengths of 1400 ± 20 and 1642 ± 23 MPa and exhibited a completely brittle fracture character, which was attributed to the high volume fraction and the morphologies of the Laves phase.

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Acknowledgements

This work was primarily supported by the Basic Research Program of Jiangsu Province (Grant No. BK20181047). Partial funding of this research by the Natural Science Foundation of Shandong Province (Grant No. ZR2019PEE042) and Changzhou Sci&Tech Program (Grant Nos. CJ20210065 and CJ20200046) is gratefully acknowledged.

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Authors and Affiliations

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

    Lu Wang, Xia Li, Hongwei Niu & Lin Yang

  2. Laboratory of Advanced Multicomponent Materials, School of Mechanical Engineering, Jiangsu University of Technology, Changzhou, 213001, People’s Republic of China

    Lu Wang, Xia Li, Hongwei Niu, Lin Yang, Mingqin Xu & Jiaojiao Yi

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  1. Lu Wang
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  2. Xia Li
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Correspondence to Jiaojiao Yi.

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Wang, L., Li, X., Niu, H. et al. Effect of Cr Incorporation on the Mechanical Properties of HfMoTiZrCr, HfMoNbZrCr, and HfMoNbTiCr Refractory High-Entropy Alloys. Met. Mater. Int. 28, 2413–2421 (2022). https://doi.org/10.1007/s12540-021-01142-z

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  • DOI: https://doi.org/10.1007/s12540-021-01142-z

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