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Microstructure and Wear Performance of High-Entropy Tribaloy Alloys

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Abstract

The material design concept of high-entropy alloy (HEA) is proposed for Tribaloy alloys. In this research, three HEAs are created by mixing Co-based T-800 and Ni-based T-700 Tribaloy alloys in different ratios and fabricated via spark plasma sintering (SPS) process. The phase transformation behavior of the mixed powders of T-800 and T-700 is investigated with differential scanning calorimetry (DSC) analysis. The microstructures of the SPS specimens and solidified DSC samples of the created HEAs are studied using SEM and XRD, showing that they consist of fcc Co, Mo, and Ni solid solution with minor hcp Co solid solution, various Laves phase, mainly Co3Mo2Si, CoMoSi, Ni3Mo2Si, Mo2Si, and CrSi2, and complex intermetallic compounds. The hardness and dry-sliding wear resistance of the created SPS HEAs are evaluated and compared with the initial alloys (T-800 and T-700). It is shown that the hardness and wear resistance of T-800 are much higher than that of T-700, which is attributed to the excellent properties of element Co; the created HEAs exhibit better hardness and wear performance than T-700 but worse than T-800. The HEA having an equal mixture ratio of T-800 and T-700, with the largest configurational entropy of 1.58R, performs the best in wear resistance among the HEAs.

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Acknowledgment

The authors are grateful for financial support from the Natural Science & Engineering Research Council of Canada (NSERC), in-kind support from National Research Council Canada (NRC), and both financial and in-kind support of Kennametal Stellite Inc.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, Canada

    Xueyao Wu, Rong Liu & Xiaozhou Zhang

  2. Kennametal Stellite Inc., 471 Dundas St E, Belleville, ON, K8N 5C4, Canada

    Matthew X. Yao

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  1. Xueyao Wu
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  2. Rong Liu
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  4. Matthew X. Yao
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Correspondence to Rong Liu.

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Wu, X., Liu, R., Zhang, X. et al. Microstructure and Wear Performance of High-Entropy Tribaloy Alloys. J. of Materi Eng and Perform (2023). https://doi.org/10.1007/s11665-023-08349-8

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