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Structure and Mechanical Properties of High-Entropy AlCuNiFeTi and AlCuNiFeCr Alloys Produced by Mechanical Activation Followed by Pressure Sintering

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X-ray diffraction, scanning electron microscopy, and micromechanical tests are employed to study the phase and structural transformations in the Al–Cu–Ni–Fe–Ti and Al–Cu–Ni–Fe–Cr equiatomic powder compositions during mechanical activation and subsequent pressure sintering. The mechanical properties of the high-entropy alloys are examined as well. It is revealed that the AlCuNiFeTi and AlCuNiFeCr nanocrystalline high-entropy alloys produced by mechanical activation consist of supersaturated substitutional solid solutions with bcc crystal structure. It is established that the alloys become three-phase after sintering and consist mainly of bcc solid solutions and an insignificant amount (to 5%) of two fcc solid solutions with different lattice parameters. It is shown that the sintered AlCuNiFeTi and AlCuNiFeCr alloys are characterized by high strength, and their Vickers microhardness reaches 11.2 ± 0.3 GPa and 9.5 ± 0.25 GPa, respectively.

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Authors and Affiliations

  1. National Technical University of Ukraine ‘Kyiv Polytechnic Institute’, Kyiv, Ukraine

    A. I. Yurkova & V. V. Chernyavskii

  2. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev, Ukraine

    V. F. Gorban’

Authors
  1. A. I. Yurkova
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  2. V. V. Chernyavskii
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  3. V. F. Gorban’
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Corresponding author

Correspondence to V. V. Chernyavskii.

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Translated from Poroshkovaya Metallurgiya, Vol. 55, Nos. 3–4 (508), pp. 37–52, 2016.

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Yurkova, A.I., Chernyavskii, V.V. & Gorban’, V.F. Structure and Mechanical Properties of High-Entropy AlCuNiFeTi and AlCuNiFeCr Alloys Produced by Mechanical Activation Followed by Pressure Sintering. Powder Metall Met Ceram 55, 152–163 (2016). https://doi.org/10.1007/s11106-016-9790-3

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  • DOI: https://doi.org/10.1007/s11106-016-9790-3

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