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

Tomohito Tsuru (), Shu Han, Shutaro Matsuura, Zhenghao Chen, Kyosuke Kishida (), Ivan Iobzenko, Satish I. Rao, Christopher Woodward, Easo P. George () and Haruyuki Inui ()
Additional contact information
Tomohito Tsuru: Japan Atomic Energy Agency
Shu Han: Kyoto University
Shutaro Matsuura: Kyoto University
Zhenghao Chen: Kyoto University
Kyosuke Kishida: 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
Haruyuki Inui: Kyoto University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: 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.

Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-024-45639-8 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45639-8

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-024-45639-8

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().