Journal
SCIENCE
Volume 370, Issue 6512, Pages 95-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aba3722
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Funding
- Office of Naval Research, Basic Research Challenge Program [N00014-18-1-2392]
- Elings Prize Fellowship in Science by the California NanoSystems Institute (CNSI) on the UC Santa Barbara campus
- Department of Defense Basic Research Office Laboratory University Collaboration Initiative (LUCI) fellowship
- United States Air Force on-site contract [FA8650-15-D-5230]
- Materials Research Science and Engineering Center (MRSEC) Program of the National Science Foundation (NSF) [DMR 1720256]
- NSF [ACI-1053575, CNS-1725797]
- CNSI
- MRSEC
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Refractory multiprincipal element alloys (MPEAs) are promising materials to meet the demands of aggressive structural applications, yet require fundamentally different avenues for accommodating plastic deformation in the body-centered cubic (bcc) variants of these alloys. We show a desirable combination of homogeneous plastic deformability and strength in the bcc MPEA MoNbTi, enabled by the rugged atomic environment through which dislocations must navigate. Our observations of dislocation motion and atomistic calculations unveil the unexpected dominance of nonscrew character dislocations and numerous slip planes for dislocation glide. This behavior lends credence to theories that explain the exceptional high temperature strength of similar alloys. Our results advance a defect-aware perspective to alloy design strategies for materials capable of performance across the temperature spectrum.
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