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Phase Selection and Microhardness of Directionally Solidified AlCoCrFeNi2.1 Eutectic High-Entropy Alloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

In the present work, the solidification behaviors and microhardness of directionally solidified AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) obtained at different growth velocities are investigated. The microstructure of the as-cast AlCoCrFeNi2.1 EHEA is composed of bulky dendrites (NiAl phase) and lamellar eutectic structures, indicating that the actual composition of the alloy slightly deviates from the eutectic point. However, it is interesting to observe that the full lamellar structure of this alloy is obtained through directional solidification. In order to explain this phenomenon, the maximum interface temperature criterion and the interface response function (IRF) theory are applied to calculate the velocity range of the transition from the primary phase to the eutectic, which is 1.2–2 × 104 μm/s. Furthermore, microhardness is one of the important parameters to measure the mechanical properties of materials. Therefore, the microhardness test is performed, and the test result indicates that the microhardness (HV) increased with increasing growth velocity (V) or decreased with increasing lamellar spacing (λ). The dependences of λ and HV on V are determined by using a linear regression analysis. The relationships between the λ, V and HV are given as: \(\lambda = 11.62V^{ - 0.48}\), HV = 305.5V 0.02and HV = 328.1λ−0.04, respectively. The microhardness of the AlCoCrFeNi2.1 EHEA increases from 312.38 HV to 329.54 HV with the increase in growth velocity (5–200 μm/s). Thus, directional solidification is an effective method to improve the mechanical properties of alloys.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No. 51871118), the Basic Scientific Research Business Expenses of the Central University and Open Project of Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University (Grant No. LZUMMM2021005), the Science and Technology Project of Lanzhou City (Grant No. 2019-1-30), the State Key Laboratory of Special Rare Metal Materials (Grant No. SKL2020K003).

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  1. Peng Peng and Shengyuan Li are contribute equally to this work.

Authors and Affiliations

  1. School of Materials Science and Energy, Lanzhou University, Lanzhou, 730000, China

    Peng Peng, Shengyuan Li, Yuanli Xu, Xudong Zhang & Zhikun Ma

  2. Gansu Institute of Metrology, Lanzhou, 730071, China

    Weiqi Chen

  3. School of Physics and Electronic Information Engineering, Qinghai Normal University, Xining, 810000, China

    Jiatai Wang

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  1. Peng Peng
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Peng, P., Li, S., Chen, W. et al. Phase Selection and Microhardness of Directionally Solidified AlCoCrFeNi2.1 Eutectic High-Entropy Alloy. Acta Metall. Sin. (Engl. Lett.) 35, 1281–1290 (2022). https://doi.org/10.1007/s40195-021-01367-2

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