Ultra-strong and strain-hardenable ultrafine-grained medium-entropy alloy via enhanced grain-boundary strengthening
- Authors
- Park, Jeong Min; Yang, Dae Cheol; Kim, Han-Jin; Kim, Dong Geun; Lee, Sunghak; Kim, Hyoung Seop; Sohn, Seok Su
- Issue Date
- 20-4월-2021
- Publisher
- TAYLOR & FRANCIS INC
- Keywords
- Medium-entropy alloy; severe plastic deformation; ultrafine grain structure; severe lattice distortion; grain boundary strengthening
- Citation
- MATERIALS RESEARCH LETTERS, v.9, no.7, pp.315 - 321
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS RESEARCH LETTERS
- Volume
- 9
- Number
- 7
- Start Page
- 315
- End Page
- 321
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/128219
- DOI
- 10.1080/21663831.2021.1913768
- ISSN
- 2166-3831
- Abstract
- An equiatomic VCoNi medium-entropy alloy possesses high sensitivity to grain-boundary strengthening, achieved by severe lattice distortions. Its ultrafine-grain structure enables 1.5 Gigapascal yield strength even for the fully recrystallized alloy with a single face-centered cubic structure. The high density of grain boundaries also generates high back stresses via piling up of massive dislocations, and the low cross-slip probabilities produce not only robust dislocation-mediated plasticity but also high back stress contribution to flow stress, which affords high strain-hardening capability to ultrafine-grain alloys, with 1.7 Gigapascal ultimate tensile strength with remarkable ductility. Our approach provides a new method for developing ultrastrong metallic materials.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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