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• W2910442486 endingPage "249" @default.
• W2910442486 startingPage "235" @default.
• W2910442486 abstract "The body centered cubic (BCC) high entropy alloys MoNbTaW and MoNbTaVW show exceptional strength retention up to 1900K. The mechanistic origin of the retained strength is unknown yet is crucial for finding the best alloys across the immense space of BCC HEA compositions. Experiments on Nb-Mo, Fe-Si and Ti-Zr-Nb alloys report decreased mobility of edge dislocations, motivating a theory of strengthening of edge dislocations in BCC alloys. Unlike pure BCC metals and dilute alloys that are controlled by screw dislocation motion at low temperatures, the strength of BCC HEAs can be controlled by edge dislocations, and especially at high temperatures, due to the barriers created for edge glide through the random field of solutes. A parameter-free theory for edge motion in BCC alloys qualitatively and quantitatively captures the strength versus temperature for the MoNbTaW and MoNbTaVW alloys. A reduced analytic version of the theory then enables screening over >600,000 compositions in the Mo-Nb-Ta-V-W family, identifying promising new compositions with high retained strength and/or reduced mass density. Overall, the theory reveals an unexpected mechanism responsible for high temperature strength in BCC alloys and paves the way for theory-guided design of stronger high entropy alloys." @default.
• W2910442486 created "2019-01-25" @default.
• W2910442486 creator A5023872191 @default.
• W2910442486 creator A5045729228 @default.
• W2910442486 date "2020-01-01" @default.
• W2910442486 modified "2023-10-18" @default.
• W2910442486 title "Mechanistic origin of high strength in refractory BCC high entropy alloys up to 1900K" @default.
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• W2910442486 doi "https://doi.org/10.1016/j.actamat.2019.10.015" @default.
• W2910442486 hasPublicationYear "2020" @default.
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