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Influence of Annealing on Microstructure and Mechanical Properties of Refractory CoCrMoNbTi0.4 High-Entropy Alloy

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Abstract

A novel refractory CoCrMoNbTi0.4 high-entropy alloy (HEA) was prepared via vacuum arc melting. After annealing treatment at different temperatures, the microstructure evolution, phase stability, and mechanical properties of the alloy were investigated. The alloy was composed of two primary body-centered cubic structures (BCC1 and BCC2) and a small amount of (Co, Cr)2Nb-type Laves phase under different annealing conditions. The microhardness and compressive strength of the heat-treated alloy was significantly enhanced by the solid-solution strengthening of the BCC phase matrix and newborn Laves phase. Especially, the alloy annealed at 1473 K (1200 °C) achieved the maximum hardness and compressive strength values of 959 ± 2 HV0.5 and 1790 MPa, respectively, owing to the enhanced volume fraction of the dispersed Laves phase. In particular, the HEAs exhibited promising high-temperature mechanical performance, when heated to an elevated temperature of 1473 K (1200 °C), with a compressive fracture strength higher than 580 MPa without fracture at a strain of more than 20 pct. This study suggests that the present refractory HEAs have immense potential for engineering applications as a new class of high-temperature structural materials.

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Acknowledgments

This research was supported by the National Key Research and Development Program of China (Grant No. 2017YFB0306102), the National Natural Science Foundation of China (Grant No. 51271034) and the Fundamental Research Funds for the Central Universities (Grant No. FRF-BR-16-023A).

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Authors and Affiliations

  1. State Key Laboratory for Advance Metals and Materials, University of Science and Technology Beijing, Beijing, 10083, People’s Republic of China

    Mina Zhang, Xianglin Zhou, Wuzhi Zhu & Jinghao Li

Authors
  1. Mina Zhang
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  2. Xianglin Zhou
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  3. Wuzhi Zhu
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  4. Jinghao Li
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Corresponding author

Correspondence to Xianglin Zhou.

Additional information

Manuscript submitted August 25, 2017.

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Zhang, M., Zhou, X., Zhu, W. et al. Influence of Annealing on Microstructure and Mechanical Properties of Refractory CoCrMoNbTi0.4 High-Entropy Alloy. Metall Mater Trans A 49, 1313–1327 (2018). https://doi.org/10.1007/s11661-018-4472-z

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