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Evolution of Microstructures and Properties in AlxCrFeMn0.8Ni2.1 HEAs

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Abstract

The microstructures, compression and corrosion behaviors of the as-cast AlxCrFeMn0.8Ni2.1 high-entropy alloys (0 ≤ x ≤ 2.3) were investigated in this paper. It was found that the crystal structure changed from initial dual FCC structure to mixed FCC and BCC structure, then to BCC structure as the increasing of Al content. Al0.8CrFeMn0.8Ni2.1 alloy exhibited a typical spinodal structure consisting of alternating two phases microstructure. Moreover, sunflower-like microstructure was obtained in the as-cast AlxCrFeMn0.8Ni2.1 alloys (1.0 ≤ x ≤ 2.0). With the increasing of Al, the macrohardness increased while the plasticity decreased in the alloys. The addition of an appropriate amount of Al could improve the compressive fracture strength of the alloys. In addition, the corrosion resistance deteriorated slightly with the increasing of Al in 1 mol/L NaCl solution.

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Acknowledgements

The authors are grateful for the financial support from the fund of National Natural Science Foundation of China (51604240), Natural Science Foundation of Hunan Province (2016JJ3121), and General Project of the Education Department of Hunan Province (15C1307, 15C1308).

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Authors and Affiliations

  1. Key Laboratory of Materials Design and Preparation Technology of Hunan Province, School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, People’s Republic of China

    Xu Chen, Di Gao, Jia Xuan Hu & Ye Liu

  2. Hunan Provincial Key Laboratory of Thin Film Materials and Devices, School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, People’s Republic of China

    Xu Chen, Di Gao, Jia Xuan Hu & Ye Liu

  3. School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan, 411201, People’s Republic of China

    Chang Ping Tang

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  1. Xu Chen
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  2. Di Gao
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Correspondence to Ye Liu.

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Chen, X., Gao, D., Hu, J.X. et al. Evolution of Microstructures and Properties in AlxCrFeMn0.8Ni2.1 HEAs. Met. Mater. Int. 25, 1135–1144 (2019). https://doi.org/10.1007/s12540-019-00282-7

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