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The Influence of AlFeNiCrCoTi High-Entropy Alloy on Microstructure, Mechanical Properties and Tribological Behaviors of Aluminum Matrix Composites

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Abstract

The microstructure, mechanical properties and tribological behaviors of aluminum matrix composites with different contents of AlFeNiCrCoTi high-entropy alloy (HEA) (4.0, 5.0 and 6.0 wt%) were investigated. The as-cast specimens were analyzed by the scanning electron microscopy and electron probe micro-analysis. The results indicated that flake-like and blocky intermetallic compounds precipitated distributing in α-Al matrix in the solidification when the concentration of HEA was more than 4.0 wt% in pure aluminum. Moreover, as the content of HEA increased, the number of the intermetallic compounds increased. Meanwhile, a new phase formed and it distributed inter-dendrite of α-Al in the solidification, which morphology was rod-shaped and the diameter was less than 200 nm. The area fraction of the nano-phases increased, and the diameter decreased with increasing the addition of HEA in pure aluminum. The tensile test illustrated that the ultimate tensile strength increased firstly and then decreased with the increase of HEA content. When the addition concentration of HEA was 4.0 wt%, the ultimate tensile strength enhanced from 58 to 142 MPa. When 5.0 wt% HEA was added into pure aluminum, the ultimate tensile strength further improved from 142 to 170 MPa. In addition, the elongation decreased from 40.6 to 22.7%. However, when 6.0 wt% HEA was added into pure aluminum, the ultimate tensile strength and elongation reduced to 157 MPa and 18.2%, respectively. The tribological behaviors of aluminum matrix composites were investigated under the condition of seawater. The friction coefficient and wear rate of aluminum matrix composites significantly decreased with the increase of HEA content. Moreover, when the addition level was up to 6.0 wt%, the friction coefficient of aluminum matrix composites decreased by 71.1% from 0.83 to 0.24, and wear rate decreased by 90.8% from 2.48 × 10−9 m3 N−1 m−1 to 2.27 × 10−10 m3 N−1 m−1.

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Acknowledgements

The authors wish to acknowledge the financial support of the National Natural Science Foundation of China (Grant No. 51561021), the State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology (SKLAB02019007) and National Innovation Training Program of College Students (DC2019165; DC2019161).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

    Qinglin Li, Xuepeng Bao, Shang Zhao, Yuqian Zhu & Yefeng Lan

  2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

    Xianyu Feng & Qiang Zhang

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  1. Qinglin Li
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  2. Xuepeng Bao
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  3. Shang Zhao
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Correspondence to Qinglin Li or Yefeng Lan.

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Li, Q., Bao, X., Zhao, S. et al. The Influence of AlFeNiCrCoTi High-Entropy Alloy on Microstructure, Mechanical Properties and Tribological Behaviors of Aluminum Matrix Composites. Inter Metalcast 15, 281–291 (2021). https://doi.org/10.1007/s40962-020-00462-x

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