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Phase Evolution and Mechanical Properties of AlCoCrFeNiSix High-Entropy Alloys Synthesized by Mechanical Alloying and Spark Plasma Sintering

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Abstract

In the current investigation, AlCoCrFeNiSix (x = 0, 0.3, 0.6 and 0.9 in atomic ratio) high-entropy alloy systems are prepared by mechanical alloying and subsequently consolidated by spark plasma sintering. The microstructural and mechanical properties were analyzed to understand the effect of Si addition in AlCoCrFeNi alloy. The x-ray diffraction analysis reveals the supersaturated solid solution of the body-centered cubic structure after 20 h of ball milling. However, the consolidation promotes the transformation of body-centered phases partially into the face-centered cubic structure and sigma phases. A recently proposed geometric model based on the atomic stress theory has been extended for the first time to classify single phase and multi-phases on the high-entropy alloys prepared by mechanical alloying and spark plasma sintering process. Improved microhardness and better wear resistance were achieved as the Si content increased from 0 to 0.9 in the present high-entropy alloy.

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Acknowledgments

The authors express their acknowledgment to Mr. Suresh Dua and Mr. Vinod Ingole for their assistance in carrying out XRD and SEM analysis. The authors would like to thank Technical Education Quality Improvement Programme-II (TEQIP-II) for partial financial support of the present work.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, National Institute of Technology, Raipur, 492010, India

    Anil Kumar & Manoj Chopkar

  2. Department of Materials Engineering (MTM), KU Leuven, Kasteelpark Arenberg 44, bus 2450, 3001, Heverlee, Belgium

    Akhilesh Kumar Swarnakar

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Kumar, A., Swarnakar, A.K. & Chopkar, M. Phase Evolution and Mechanical Properties of AlCoCrFeNiSix High-Entropy Alloys Synthesized by Mechanical Alloying and Spark Plasma Sintering. J. of Materi Eng and Perform 27, 3304–3314 (2018). https://doi.org/10.1007/s11665-018-3409-4

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