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Phase Composition and Superplastic Behavior of a Wrought AlCoCrCuFeNi High-Entropy Alloy

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Abstract

A cast AlCoCrCuFeNi high-entropy alloy was multiaxially forged at 950°C to produce a fine homogeneous mixture of grains/particles of four different phases with the average size of ~2.1 μm. The forged alloy exhibited unusual superplastic behavior accompanied by a pronounced softening stage, followed by a steady-state flow stage, during tensile deformation at temperatures of 800°C–1000°C and at strain rates of 10−4–10−1 s−1. Despite the softening stage, no noticeable strain localization was observed and a total elongation of up to 1240% was obtained. A detailed analysis of the phase composition and microstructure of the alloy before and after superplastic deformation was conducted, the strain rate and temperature dependences of the flow stress were determined at different stages of the superplastic deformation, and the relationships between the microstructure and properties were identified and discussed.

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Acknowledgement

The financial support from the Ministry of Science and Education of Russian Federation through the Grant No. 02.11.740.5184 is kindly appreciated.

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Authors and Affiliations

  1. Laboratory of Bulk Nanostructured Materials, Belgorod State University, 85 Pobeda St., Belgorod, 308015, Russia

    D. G. Shaysultanov, N. D. Stepanov, A. V. Kuznetsov & G. A. Salishchev

  2. UES, Inc., 4401 Dayton-Xenia Rd., Dayton, OH, 45432, USA

    O. N. Senkov

Authors
  1. D. G. Shaysultanov
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  2. N. D. Stepanov
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  3. A. V. Kuznetsov
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  4. G. A. Salishchev
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  5. O. N. Senkov
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Correspondence to O. N. Senkov.

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Shaysultanov, D.G., Stepanov, N.D., Kuznetsov, A.V. et al. Phase Composition and Superplastic Behavior of a Wrought AlCoCrCuFeNi High-Entropy Alloy. JOM 65, 1815–1828 (2013). https://doi.org/10.1007/s11837-013-0754-5

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  • DOI: https://doi.org/10.1007/s11837-013-0754-5

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