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Microstructural Stability of As-Cast and Directionally Solidified AlCoCrFeNi2.1 Eutectic High-Entropy Alloys at Elevated Temperatures

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Abstract

In this article, we investigate the microstructural stability of as-cast and directionally solidified (DS) AlCoCrFeNi2.1 eutectic high-entropy alloys at elevated temperatures (900 °C to 1100 °C). The microstructure of the as-cast alloy is composed of a lamellar and mesh-like structure consisting of NiAl-rich (B2) and CoCrFeNi-rich (L12) phases. Annealing at 900 °C to 1100 °C results in the coarsening of the lamellar or mesh-like structures and the migration of termination. For the as-DS alloy, the solid–liquid interface undergoes a transition from planar to cellular morphology along with the decrease of interlamellar spacing with increasing the withdrawal rates. After the same heat treatment, the stability of DS microstructure is relatively excellent at 6 μm/s where only a little coarsening and migration of the lamellar structure occur. With increasing withdrawal rates, the microstructural degradation, like the coarsening of lamellar or mesh-like structures and the migration of termination, becomes severe because of the decrease of interlamellar spacing. Moreover, an interesting phenomenon is that the coarsening of the lamellar structure occurs along with the thinning of the adjacent lamellae at 1100 °C for the as-cast alloy or the DS alloy at 120 μm/s due to the fine interlamellar spacing. The relevant coarsening and migration mechanisms are discussed. In addition, the precipitate forms at 900 °C in all the experimental alloys and is identified as Ni-rich phase (FCC).

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Acknowledgments

The work is supported by the National Natural Science Foundation of China (Grant Nos. 51501147, 51674196), Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2019JM-438), the fund of the State Key Laboratory of Solidification Processing in NPU (Grant No. SKLSP202007) and China Postdoctoral Science Foundation (Grant No. 2018M641005).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, P.R. China

    Lei Wang, Xinyuan Wu, Chengli Yao, Yunpeng Zhang, Yuhui Ge & Guojun Zhang

  2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, P.R. China

    Jun Shen

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  1. Lei Wang
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Manuscript submitted January 21, 2020.

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Wang, L., Wu, X., Yao, C. et al. Microstructural Stability of As-Cast and Directionally Solidified AlCoCrFeNi2.1 Eutectic High-Entropy Alloys at Elevated Temperatures. Metall Mater Trans A 51, 5781–5789 (2020). https://doi.org/10.1007/s11661-020-05993-w

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