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

Jeong Min Park; Dae Cheol Yang; Han Jin Kim; Dong Geun Kim; Sunghak Lee; Hyoung Seop Kim; Seok Su Sohn

doi:10.1080/21663831.2021.1913768

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

Jeong Min Park, Dae Cheol Yang, Han Jin Kim, Dong Geun Kim, Sunghak Lee, Hyoung Seop Kim, Seok Su Sohn

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

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.

Original language	English
Pages (from-to)	315-321
Number of pages	7
Journal	Materials Research Letters
Volume	9
Issue number	7
DOIs	https://doi.org/10.1080/21663831.2021.1913768
Publication status	Published - 2021

Keywords

Medium-entropy alloy
grain boundary strengthening
severe lattice distortion
severe plastic deformation
ultrafine grain structure

ASJC Scopus subject areas

Materials Science(all)

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10.1080/21663831.2021.1913768

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

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.",

keywords = "Medium-entropy alloy, grain boundary strengthening, severe lattice distortion, severe plastic deformation, ultrafine grain structure",

author = "Park, {Jeong Min} and Yang, {Dae Cheol} and Kim, {Han Jin} and Kim, {Dong Geun} and Sunghak Lee and Kim, {Hyoung Seop} and Sohn, {Seok Su}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (grant number?NRF-2020R1C1C1003554); the Creative Materials Discovery Program of the NRF?funded by the Ministry of Science and ICT [grant number NRF-2016M3D1A1023384]; the Korea Institute for Advancement of Technology (KIAT) grant funded by the Korean Government (MOTIE) [grant number P0002019, The Competency Development Program for Industry Specialist]. J.M. Park is also supported by the Basic Science Research Program ?Fostering the Next Generation of Researchers? through the NRF funded by the Ministry of Education [grant number 2020R1A6A3A13073260]. Publisher Copyright: {\textcopyright} 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.",

year = "2021",

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AU - Park, Jeong Min

AU - Yang, Dae Cheol

AU - Kim, Han Jin

AU - Kim, Dong Geun

AU - Lee, Sunghak

AU - Kim, Hyoung Seop

AU - Sohn, Seok Su

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (grant number?NRF-2020R1C1C1003554); the Creative Materials Discovery Program of the NRF?funded by the Ministry of Science and ICT [grant number NRF-2016M3D1A1023384]; the Korea Institute for Advancement of Technology (KIAT) grant funded by the Korean Government (MOTIE) [grant number P0002019, The Competency Development Program for Industry Specialist]. J.M. Park is also supported by the Basic Science Research Program ?Fostering the Next Generation of Researchers? through the NRF funded by the Ministry of Education [grant number 2020R1A6A3A13073260]. Publisher Copyright: © 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

PY - 2021

Y1 - 2021

N2 - 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.

AB - 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.

KW - Medium-entropy alloy

KW - grain boundary strengthening

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KW - severe plastic deformation

KW - ultrafine grain structure

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

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