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Refractory Multi-Principal Element Alloys, CrHfNbTa0.5Zr and CrHfMo0.5Ta0.5Zr, with High Strength at Ambient Temperature

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Abstract

Two refractory CrHfNbTa0.5Zr and CrHfMo0.5Ta0.5Zr alloys were designed and prepared by a vacuum arc-melting based on HfNbTaTiZr, exhibiting a dendritic structure with different morphologies and phase components. The round/elliptical dendrites surrounded with the intertwined Cr-rich Laves matrix and Zr-rich BCC network structure of the as-cast CrHfNbTa0.5Zr unprecedently improved the yield strength to 1590 ± 22 MPa, 1.7 times more than 929 MPa of HfNbTaTiZr, and retained a promising plasticity of ~ 5%. In contrast, CrHfMo0.5Ta0.5Zr was barely satisfactory either in strength or plasticity, due to the lath-like dendrites composed of the Mo-rich Laves phase with a high-volume fraction of ~ 70%. A common BCC to HCP phase transformation occurred in the two alloys originated from the instability of (Zr, Hf)-rich BCC phase and the relatively high self-diffusivities and interdiffusion of Zr during the annealing. The hard HCP phase further increased the yield strength of the alloy-Nb but deteriorated the plasticity of the two alloys.

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Acknowledgements

Financial supports from Changzhou Science and Technology Bureau (No. CJ20220057, CJ20210065, CQ20210086) and Graduate Practice and Innovation Projects of Jiangsu University of Technology (XSJCX22_03) are gratefully acknowledged.

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Authors and Affiliations

  1. School of Materials Engineering, Jiangsu University of Technology, Changzhou, 213001, China

    Lu Wang, Zhengzhong Feng & Lin Yang

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

    Lu Wang, Zhengzhong Feng, Mingqin Xu, Lin Yang & Jiaojiao Yi

  3. Jiangsu JITRI Advanced Energy Materials Research Institute Co., Ltd, Changzhou, 213001, China

    Zongzhen Li

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  1. Lu Wang
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  2. Zhengzhong Feng
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Correspondence to Jiaojiao Yi.

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Wang, L., Feng, Z., Xu, M. et al. Refractory Multi-Principal Element Alloys, CrHfNbTa0.5Zr and CrHfMo0.5Ta0.5Zr, with High Strength at Ambient Temperature. Trans Indian Inst Met 76, 719–727 (2023). https://doi.org/10.1007/s12666-022-02768-2

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