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Effects of Ta Addition on the Microstructure and Mechanical Properties of CoCu0.5FeNi High-Entropy Alloy

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Abstract

In this work, the alloying effects of Ta element on the microstructure evolution and mechanical properties of CoCu0.5FeNiTax (x = 0-0.6 at.%) high-entropy alloys were studied. The microstructure changed from single solid solution to hypoeutectic, then to eutectic, and finally to hypereutectic with the increase in Ta content, which is because Ta element facilitates the Laves phase to form. The volume fraction of hard and brittle Laves phase increases with the Ta content, which increases the yield strength, Vickers hardness and theoretical density but decreases the plastic strain. The CoCu0.5FeNiTa0.1 alloy with a single FCC solid solution structure shows the optimal balance between density and ductility. The theoretical density and tensile fracture strain can reach 8.94 g/cm3 and 36.3%, respectively.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. 51671044, 51822402 and 51574058), Dalian Support Plan for Innovation of High-level Talents (Top and Leading Talents, 2015R013), the Fundamental Research Funds for the Central Universities, Dalian Support Plan for Innovation of High-level Talents (Youth Technology Stars, 2016RQ005).

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  1. Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Tingting Xu, Yiping Lu, Zhiqiang Cao, Tongmin Wang & Tingju Li

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Xu, T., Lu, Y., Cao, Z. et al. Effects of Ta Addition on the Microstructure and Mechanical Properties of CoCu0.5FeNi High-Entropy Alloy. J. of Materi Eng and Perform 28, 7642–7648 (2019). https://doi.org/10.1007/s11665-019-04463-8

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