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Microstructures and Properties of AlCoCrNiFe High-Entropy Alloy Sintered by Hot Oscillating Pressing Under Different Sintering Times

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Abstract

Powder metallurgy is an effective method for preparing high-performance powder high-entropy alloys (HEAs). Among them, the sintering time has an important effect on the microstructure, density, Vickers hardness, and corrosion resistance of AlCoCrNiFe HEAs sintered by hot oscillating pressing (HOP). Thus the effect of sintering time (0.5 h, 1 h, and 1.5 h) on the microstructure and properties of AlCoCrNiFe HEAs has been systematically investigated in this work. The results showed that the densities of HEAs alloys showed a linear relationship with the content of the FCC phase and sintering time. At the same sintering time, HOP could effectively promote the disappearance of the original particle boundary, improve the microstructure uniformity, and reduce the internal pores. The hardness and corrosion resistance properties were increased with increasing sintering time, and were better than those of the hot press (HP)-sintered samples. When the sintering time was 1.5 h, the density and hardness of a HOP-ed sample could reach 99.18% and 479.12 HV1, respectively, while the minimum corrosion current density and corrosion rate were only 6.5 μA/cm2 and 0.055 mm/year, respectively. Thus, the hardness and corrosion resistance properties of AlCoCrNiFe had been simultaneously enhanced. Therefore, we believe that appropriately increasing the sintering time is beneficial for improving the performance of HOP-ed HEAs alloys, but this does not mean that the sintering time can be endlessly increased.

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Acknowledgements

This research work is supported by National Natural Science Foundation of China (51904277, 52374370, 52072201), the Opening Foundation of Key Laboratory of Advanced Manufacture Technology for Automobile Parts, Ministry of Education (2022 KLMT05), the Open Fund of Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology (202307A04), the Key Laboratory of materials and surface technology, Ministry of Education (No. xxx-2023-zd002), the State Key Laboratory of Metal Extrusion and Forging Equipment Technology, China National Heavy Machinery Research Institute Co,.Ltd (S2308100.W13), the Open Fund of Sichuan Province Engineering Technology Research Center of Powder Metallurgy, Chengdu University (SC-FMYJ2023-02), the Open Fund of Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering at Wuhan University of Science and Technology (MTMEOF2022B02), Training Program for Young Backbone Teachers in Colleges and University of Henan Province (2020GGJS171).

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Authors and Affiliations

  1. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, People’s Republic of China

    Ka Gao & Chunyang Ren

  2. Key Laboratory of Advanced Manufacture Technology for Automobile Parts (Chongqing University of Technology), Ministry of Education, Chongqing, 401135, People’s Republic of China

    Ka Gao

  3. School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou, 450015, People’s Republic of China

    Ziqian Wu, Dejian Sun & Yang Gao

  4. Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan, 430068, People’s Republic of China

    Yan Xiong

  5. School of Mechanical Engineering, Dongguan University of Technology, Dongguan, 523808, People’s Republic of China

    Linan An

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  1. Ka Gao
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Contributions

Ka Gao: Investigation, Conceptualization, Writing-review & editing. Ziqian Wu: Resources, Writing-original draft. Chunyang Ren: Writing-review & editing. Yan Xiong: Investigation, Funding acquisition. Dejian Sun: Conceptualization, Investigation. Yang Gao: Methodology, Formal analysis, Investigation. Linan An: Writing-review & editing, Funding acquisition.

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Gao, K., Wu, Z., Ren, C. et al. Microstructures and Properties of AlCoCrNiFe High-Entropy Alloy Sintered by Hot Oscillating Pressing Under Different Sintering Times. JOM 76, 2554–2562 (2024). https://doi.org/10.1007/s11837-024-06459-9

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