Ultra-strong and strain-hardenable ultrafine-grained medium-entropy alloy via enhanced grain-boundary strengthening

Autor:	Jeong Min Park, Dae Cheol Yang, Han-Jin Kim, Dong Geun Kim, Sunghak Lee, Hyoung Seop Kim, Seok Su Sohn
Jazyk:	angličtina
Rok vydání:	2021
Předmět:	medium-entropy alloy severe plastic deformation ultrafine grain structure severe lattice distortion grain boundary strengthening Materials of engineering and construction. Mechanics of materials TA401-492
Zdroj:	Materials Research Letters, Vol 9, Iss 7, Pp 315-321 (2021)
Druh dokumentu:	article
ISSN:	2166-3831 21663831
DOI:	10.1080/21663831.2021.1913768
Popis:	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.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/4b510463a15242b185528dcc0c70ba46 Zobrazit plný text záznamu View record in DOAJ