Strength can be controlled by edge dislocations in refractory high-entropy alloys.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
16 Sep 2021
16 Sep 2021
Historique:
received:
30
11
2020
accepted:
31
08
2021
entrez:
17
9
2021
pubmed:
18
9
2021
medline:
18
9
2021
Statut:
epublish
Résumé
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 10
Identifiants
pubmed: 34531394
doi: 10.1038/s41467-021-25807-w
pii: 10.1038/s41467-021-25807-w
pmc: PMC8446014
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
5474Informations de copyright
© 2021. The Author(s).
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