Superior High-Temperature Strength in a Supersaturated Refractory High-Entropy Alloy.
alloy design
high-temperature strength
neutron scattering
phase stability
refractory high-entropy alloy
Journal
Advanced materials (Deerfield Beach, Fla.)
ISSN: 1521-4095
Titre abrégé: Adv Mater
Pays: Germany
ID NLM: 9885358
Informations de publication
Date de publication:
Dec 2021
Dec 2021
Historique:
revised:
01
09
2021
received:
28
03
2021
pubmed:
9
10
2021
medline:
9
10
2021
entrez:
8
10
2021
Statut:
ppublish
Résumé
Refractory high-entropy alloys (RHEAs) show promising applications at high temperatures. However, achieving high strengths at elevated temperatures above 1173K is still challenging due to heat softening. Using intrinsic material characteristics as the alloy-design principles, a single-phase body-centered-cubic (BCC) CrMoNbV RHEA with high-temperature strengths (beyond 1000 MPa at 1273 K) is designed, superior to other reported RHEAs as well as conventional superalloys. The origin of the high-temperature strength is revealed by in situ neutron scattering, transmission-electron microscopy, and first-principles calculations. The CrMoNbV's elevated-temperature strength retention up to 1273 K arises from its large atomic-size and elastic-modulus mismatches, the insensitive temperature dependence of elastic constants, and the dominance of non-screw character dislocations caused by the strong solute pinning, which makes the solid-solution strengthening pronounced. The alloy-design principles and the insights in this study pave the way to design RHEAs with outstanding high-temperature strength.
Identifiants
pubmed: 34623699
doi: 10.1002/adma.202102401
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e2102401Subventions
Organisme : National Science Foundation
ID : DMR-1611180
Organisme : National Science Foundation
ID : 1809640
Organisme : Army Research Office
ID : W911NF-13-1-0438
Organisme : Army Research Office
ID : W911NF-19-2-0049
Organisme : National Energy Technology Laboratory
Organisme : Office of Science
Organisme : Argonne National Laboratory
ID : DE-AC02-06CH11357
Informations de copyright
© 2021 Wiley-VCH GmbH.
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