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

Chanho Lee, Francesco Maresca (), Rui Feng, Yi Chou, T. Ungar, Michael Widom, Ke An, Jonathan D. Poplawsky, Yi-Chia Chou, Peter K. Liaw () and W. A. Curtin
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Chanho Lee: The University of Tennessee
Francesco Maresca: University of Groningen
Rui Feng: The University of Tennessee
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

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-25807-w

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