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Microstructure and Properties of AlCoCrFeNi2.1 Eutectic High-Entropy Alloy Coatings Fabricated by Extreme High-Speed and Conventional Laser Cladding

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Abstract

AlCoCrFeNi2.1 eutectic high-entropy alloys (HEAs) are a new kind of alloy with high entropy and eutectic properties. Their advantages in terms of strength and shape matching can be fully exploited using extreme high-speed laser cladding (EHLA). In this paper, AlCoCrFeNi2.1 eutectic HEA coatings were prepared by conventional laser cladding (CLA) and EHLA. The microstructures and phase compositions of the two coatings were analyzed by scanning electron microscopy, x-ray diffraction, and electron backscatter diffraction. The microhardness and wear resistance values of the coatings were tested using a microhardness tester and a friction and wear tester, respectively. The results showed that the surface qualities of both the CLA and EHLA coatings were good and had no cracks or defects. Compared with those of the CLA coating, the EHLA coating had finer grains and a more uniform distribution. Both coatings contained face-centered cubic (FCC) and body-centered cubic (BCC) phases, but the BCC phase of the EHLA coating was less precipitated than the CLA coating. The higher microhardness and better wear resistance of the EHLA coatings occurred in the presence of Hall–Petch strengthening.

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Acknowledgments

This research was financially supported by National Natural Science Foundation of China (Nos. 52005113, 52275366, 52203378), Tianjin Science and Technology Plan Project (22JCYBJC01590), and Young Talent Support Project of Guangzhou Association for Science and Technology (QT-2023-038).

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Authors and Affiliations

  1. National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die & Mould, Tianjin University of Technology and Education, Tianjin, 300222, China

    Jia Wang, Yang Li, Jin Liu, Na Tan, Yujie Zhou & Yujun Cai

  2. National Engineering Laboratory of Modern Materials Surface Engineering Technology, Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou, 510651, Guangdong, China

    Bingwen Lu

  3. Aerospace Research Institute of Materials and Processing Technology, Beijing, 10076, China

    Zichuan Lu

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  1. Jia Wang
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  2. Yang Li
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Contributions

JW contributed to investigation and writing-original draft. YL contributed to methodology and review & editing. BL and YC helped in investigation and data curation. JL and NT contributed to conceptualization, review & editing. YZ and ZL helped in investigation.

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Correspondence to Yang Li or Bingwen Lu.

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Wang, J., Li, Y., Lu, B. et al. Microstructure and Properties of AlCoCrFeNi2.1 Eutectic High-Entropy Alloy Coatings Fabricated by Extreme High-Speed and Conventional Laser Cladding. J Therm Spray Tech 33, 992–1005 (2024). https://doi.org/10.1007/s11666-024-01734-2

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