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• W3045950551 abstract "Abstract In traditional body-centered cubic (bcc) metals, the core properties of screw dislocations play a critical role in plastic deformation at low temperatures. Recently, much attention has been focused on refractory high-entropy alloys (RHEAs), which also possess bcc crystal structures. However, unlike face-centered cubic high-entropy alloys (HEAs), there have been far fewer investigations into bcc HEAs, specifically on the possible effects of chemical short-range order (SRO) in these multiple principal element alloys on dislocation mobility. Here, using density functional theory, we investigate the distribution of dislocation core properties in MoNbTaW RHEAs alloys, and how they are influenced by SRO. The average values of the core energies in the RHEA are found to be larger than those in the corresponding pure constituent bcc metals, and are relatively insensitive to the degree of SRO. However, the presence of SRO is shown to have a large effect on narrowing the distribution of dislocation core energies and decreasing the spatial heterogeneity of dislocation core energies in the RHEA. It is argued that the consequences of the mechanical behavior of HEAs is a change in the energy landscape of the dislocations, which would likely heterogeneously inhibit their motion." @default.
• W3045950551 created "2020-08-03" @default.
• W3045950551 creator A5017030843 @default.
• W3045950551 creator A5034751387 @default.
• W3045950551 creator A5036265708 @default.
• W3045950551 creator A5041253700 @default.
• W3045950551 date "2020-07-29" @default.
• W3045950551 modified "2023-10-17" @default.
• W3045950551 title "Ab initio modeling of the energy landscape for screw dislocations in body-centered cubic high-entropy alloys" @default.
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• W3045950551 doi "https://doi.org/10.1038/s41524-020-00377-5" @default.
• W3045950551 hasPublicationYear "2020" @default.
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