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Compressive deformation behavior of CrMnFeCoNi high-entropy alloy

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Abstract

The compressive deformation behavior of a single phase CrMnFeCoNi high-entropy alloy (HEA) is investigated using experimental and theoretical approaches. The equiaxed microstructures are observed using optical microscope, electron backscattered diffraction, and synchrotron X-ray diffraction (XRD) techniques. Compressive results reveal that the CrMnFeCoNi HEA has a high strain-hardening exponent in spite of its large grain size due to increased dislocation density and severe lattice distortion. The compressive texture of the HEA resembles those of typical FCC metals. The phenomenological dislocation-based constitutive model well describes the compressive deformation behavior. The predicted dislocation density is in good quantitative agreement with the experimental value measured using whole-profile fitting of synchrotron XRD peaks. It can be confirmed from the experimental and theoretical findings that the deformation mechanism of the CrMnFeCoNi HEA is the conventional dislocation glide and mechanical twinning is negligible contrary to general belief.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Min Ji Jang & Hyoung Seop Kim

  2. Center for High Entropy Alloys, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Min Ji Jang & Hyoung Seop Kim

  3. Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan

    Soo-Hyun Joo

  4. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, 30013, China

    Che-Wei Tsai & Jien-Wei Yeh

Authors
  1. Min Ji Jang
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  2. Soo-Hyun Joo
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  3. Che-Wei Tsai
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  4. Jien-Wei Yeh
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  5. Hyoung Seop Kim
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Correspondence to Hyoung Seop Kim.

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Jang, M.J., Joo, SH., Tsai, CW. et al. Compressive deformation behavior of CrMnFeCoNi high-entropy alloy. Met. Mater. Int. 22, 982–986 (2016). https://doi.org/10.1007/s12540-016-6304-2

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  • DOI: https://doi.org/10.1007/s12540-016-6304-2

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