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Intrinsic factors responsible for brittle versus ductile nature of refractory high-entropy alloys

Author

Listed:
  • Tomohito Tsuru

    (Japan Atomic Energy Agency
    Kyoto University)

  • Shu Han

    (Kyoto University)

  • Shutaro Matsuura

    (Kyoto University)

  • Zhenghao Chen

    (Kyoto University)

  • Kyosuke Kishida

    (Kyoto University
    Kyoto University)

  • Ivan Iobzenko

    (Japan Atomic Energy Agency)

  • Satish I. Rao

    (Johns Hopkins University)

  • Christopher Woodward

    (Wright Patterson Air Force Base)

  • Easo P. George

    (University of Tennessee
    Ruhr University Bochum)

  • Haruyuki Inui

    (Kyoto University
    Kyoto University)

Abstract

Refractory high-entropy alloys (RHEAs) are of interest for ultrahigh-temperature applications. To overcome their drawbacks — low-temperature brittleness and poor creep strength at high temperatures — improved fundamental understanding is needed. Using experiments, theory, and modeling, we investigated prototypical body-centered cubic (BCC) RHEAs, TiZrHfNbTa and VNbMoTaW. The former is compressible to 77 K, whereas the latter is not below 298 K. Hexagonal close-packed (HCP) elements in TiZrHfNbTa lower its dislocation core energy, increase lattice distortion, and lower its shear modulus relative to VNbMoTaW whose elements are all BCC. Screw dislocations dominate TiZrHfNbTa plasticity, but equal numbers of edges and screws exist in VNbTaMoW. Dislocation cores are compact in VNbTaMoW and extended in TiZrHfNbTa, and different macroscopic slip planes are activated in the two RHEAs, which we attribute to the concentration of HCP elements. Our findings demonstrate how ductility and strength can be controlled through the ratio of HCP to BCC elements in RHEAs.

Suggested Citation

  • Tomohito Tsuru & Shu Han & Shutaro Matsuura & Zhenghao Chen & Kyosuke Kishida & Ivan Iobzenko & Satish I. Rao & Christopher Woodward & Easo P. George & Haruyuki Inui, 2024. "Intrinsic factors responsible for brittle versus ductile nature of refractory high-entropy alloys," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45639-8
    DOI: 10.1038/s41467-024-45639-8
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    References listed on IDEAS

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    1. Lucile Dezerald & David Rodney & Emmanuel Clouet & Lisa Ventelon & François Willaime, 2016. "Plastic anisotropy and dislocation trajectory in BCC metals," Nature Communications, Nature, vol. 7(1), pages 1-7, September.
    2. Chanho Lee & Francesco Maresca & Rui Feng & Yi Chou & T. Ungar & Michael Widom & Ke An & Jonathan D. Poplawsky & Yi-Chia Chou & Peter K. Liaw & W. A. Curtin, 2021. "Strength can be controlled by edge dislocations in refractory high-entropy alloys," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
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