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Strength can be controlled by edge dislocations in refractory high-entropy alloys

Author

Listed:
  • Chanho Lee

    (The University of Tennessee
    Los Alamos National Laboratory)

  • Francesco Maresca

    (University of Groningen
    École Polytechnique Fédérale de Lausanne)

  • Rui Feng

    (The University of Tennessee
    Oak Ridge National Laboratory)

  • Yi Chou

    (National Yang Ming Chiao Tung University)

  • T. Ungar

    (Eötvös University)

  • Michael Widom

    (Carnegie Mellon University)

  • Ke An

    (Oak Ridge National Laboratory)

  • Jonathan D. Poplawsky

    (Oak Ridge National Laboratory)

  • Yi-Chia Chou

    (National Yang Ming Chiao Tung University)

  • Peter K. Liaw

    (The University of Tennessee)

  • W. A. Curtin

    (École Polytechnique Fédérale de Lausanne)

Abstract

Energy efficiency is motivating the search for new high-temperature (high-T) metals. Some new body-centered-cubic (BCC) random multicomponent “high-entropy alloys (HEAs)” based on refractory elements (Cr-Mo-Nb-Ta-V-W-Hf-Ti-Zr) possess exceptional strengths at high temperatures but the physical origins of this outstanding behavior are not known. Here we show, using integrated in-situ neutron-diffraction (ND), high-resolution transmission electron microscopy (HRTEM), and recent theory, that the high strength and strength retention of a NbTaTiV alloy and a high-strength/low-density CrMoNbV alloy are attributable to edge dislocations. This finding is surprising because plastic flows in BCC elemental metals and dilute alloys are generally controlled by screw dislocations. We use the insight and theory to perform a computationally-guided search over 107 BCC HEAs and identify over 106 possible ultra-strong high-T alloy compositions for future exploration.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-25807-w
    DOI: 10.1038/s41467-021-25807-w
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    Cited by:

    1. H. Wang & P. Y. Yang & W. J. Zhao & S. H. Ma & J. H. Hou & Q. F. He & C. L. Wu & H. A. Chen & Q. Wang & Q. Cheng & B. S. Guo & J. C. Qiao & W. J. Lu & S. J. Zhao & X. D. Xu & C. T. Liu & Y. Liu & C. W, 2024. "Lattice distortion enabling enhanced strength and plasticity in high entropy intermetallic alloy," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    2. 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.

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