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Phase Evolution and Thermal Analysis of Nanocrystalline AlCrCuFeNiZn High Entropy Alloy Produced by Mechanical Alloying

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Abstract

A multi-component nanocrystalline AlCrCuFeNiZn high entropy alloy with 12 nm crystallite size was successfully synthesized using high energy ball milling. The progress of solid solution formation during milling was analyzed using XRD. A major portion of the HEA is observed to be BCC in crystal structure after 30 h of milling. Thermal analysis showed that HEA powders exhibited exponential oxidation characteristics. Thermal analysis showed that low activation energy was sufficient to start recrystallization because of high energy stored in the milled powders. The crystallite size after consolidation is in nanocrystalline range due to the sluggish diffusion of atoms and nanotwinning. After consolidation, the crystallite size is around 79 nm. Samples sintered at 850 °C for 2 h exhibited high hardness values of 700 ± 15 HV1.0, major volume fraction of the phases are having FCC crystal structure along with a minor phase having BCC crystal structure. Due to positive enthalpy mixing of Cu with other elements, decomposition of BCC to new FCC phases occurs.

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Authors and Affiliations

  1. Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirapalli, 620015, Tamil Nadu, India

    N. T. B. N. Koundinya, C. Sajith Babu, K. Sivaprasad & P. Susila

  2. Joining Technology Group, Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore, 638075, Singapore

    N. Kishore Babu

  3. Department of Metallurgy, College of Engineering, Andhra University, Visakhapatnam, 530003, Andhra Pradesh, India

    J. Baburao

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  1. N. T. B. N. Koundinya
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  2. C. Sajith Babu
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  3. K. Sivaprasad
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Correspondence to K. Sivaprasad.

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Koundinya, N.T.B.N., Sajith Babu, C., Sivaprasad, K. et al. Phase Evolution and Thermal Analysis of Nanocrystalline AlCrCuFeNiZn High Entropy Alloy Produced by Mechanical Alloying. J. of Materi Eng and Perform 22, 3077–3084 (2013). https://doi.org/10.1007/s11665-013-0580-5

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  • DOI: https://doi.org/10.1007/s11665-013-0580-5

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