Activation of deformation twinning in ultrafine-grained high-entropy alloys via tailoring stacking fault energy and critical twinning stress

Seungjin Nam; Hansol Son; Yongwook Song; Juyeon Han; Won Seok Ko; Seok Su Sohn; Hyoung Seop Kim; Hyunjoo Choi

doi:10.1016/j.msea.2023.146055

Activation of deformation twinning in ultrafine-grained high-entropy alloys via tailoring stacking fault energy and critical twinning stress

Seungjin Nam, Hansol Son, Yongwook Song, Juyeon Han, Won Seok Ko, Seok Su Sohn, Hyoung Seop Kim, Hyunjoo Choi

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

1 Citation (Scopus)

Abstract

In this study, we propose a new material design approach to activate deformation twinning in ultrafine-grained (UFG) AlCoCrCuFeNiTi-based high-entropy alloys (HEAs) by considering both thermodynamic and microstructural aspects. Stacking fault energy of the solid-solution phase is reduced by tailoring composition with increasing Co/Ni ratio and diminishing the concentration of Al and Ti through precipitation. Furthermore, grain size is adjusted to enable the flow stress to surpass the critical twinning stress. It results in the activation of nano-twinning in the UFG HEAs, making the alloys exhibit high strain-hardening after yielding from 1.6 to 2.3 GPa.

Original language	English
Article number	146055
Journal	Materials Science and Engineering: A
Volume	897
DOIs	https://doi.org/10.1016/j.msea.2023.146055
Publication status	Published - 2024 Apr

Bibliographical note

Publisher Copyright:
© 2024 Elsevier B.V.

Keywords

Compositional tailoring
High-entropy alloys
Nano-twinning
Staking fault energy
Work-hardening

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.msea.2023.146055

Cite this

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title = "Activation of deformation twinning in ultrafine-grained high-entropy alloys via tailoring stacking fault energy and critical twinning stress",

abstract = "In this study, we propose a new material design approach to activate deformation twinning in ultrafine-grained (UFG) AlCoCrCuFeNiTi-based high-entropy alloys (HEAs) by considering both thermodynamic and microstructural aspects. Stacking fault energy of the solid-solution phase is reduced by tailoring composition with increasing Co/Ni ratio and diminishing the concentration of Al and Ti through precipitation. Furthermore, grain size is adjusted to enable the flow stress to surpass the critical twinning stress. It results in the activation of nano-twinning in the UFG HEAs, making the alloys exhibit high strain-hardening after yielding from 1.6 to 2.3 GPa.",

keywords = "Compositional tailoring, High-entropy alloys, Nano-twinning, Staking fault energy, Work-hardening",

author = "Seungjin Nam and Hansol Son and Yongwook Song and Juyeon Han and Ko, {Won Seok} and Sohn, {Seok Su} and Kim, {Hyoung Seop} and Hyunjoo Choi",

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year = "2024",

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doi = "10.1016/j.msea.2023.146055",

language = "English",

volume = "897",

journal = "Materials Science and Engineering: A",

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T1 - Activation of deformation twinning in ultrafine-grained high-entropy alloys via tailoring stacking fault energy and critical twinning stress

AU - Nam, Seungjin

AU - Son, Hansol

AU - Song, Yongwook

AU - Han, Juyeon

AU - Ko, Won Seok

AU - Sohn, Seok Su

AU - Kim, Hyoung Seop

AU - Choi, Hyunjoo

PY - 2024/4

Y1 - 2024/4

N2 - In this study, we propose a new material design approach to activate deformation twinning in ultrafine-grained (UFG) AlCoCrCuFeNiTi-based high-entropy alloys (HEAs) by considering both thermodynamic and microstructural aspects. Stacking fault energy of the solid-solution phase is reduced by tailoring composition with increasing Co/Ni ratio and diminishing the concentration of Al and Ti through precipitation. Furthermore, grain size is adjusted to enable the flow stress to surpass the critical twinning stress. It results in the activation of nano-twinning in the UFG HEAs, making the alloys exhibit high strain-hardening after yielding from 1.6 to 2.3 GPa.

AB - In this study, we propose a new material design approach to activate deformation twinning in ultrafine-grained (UFG) AlCoCrCuFeNiTi-based high-entropy alloys (HEAs) by considering both thermodynamic and microstructural aspects. Stacking fault energy of the solid-solution phase is reduced by tailoring composition with increasing Co/Ni ratio and diminishing the concentration of Al and Ti through precipitation. Furthermore, grain size is adjusted to enable the flow stress to surpass the critical twinning stress. It results in the activation of nano-twinning in the UFG HEAs, making the alloys exhibit high strain-hardening after yielding from 1.6 to 2.3 GPa.

KW - Compositional tailoring

KW - High-entropy alloys

KW - Nano-twinning

KW - Staking fault energy

KW - Work-hardening

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U2 - 10.1016/j.msea.2023.146055

DO - 10.1016/j.msea.2023.146055

M3 - Article

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SN - 0921-5093

VL - 897

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

M1 - 146055

ER -

Activation of deformation twinning in ultrafine-grained high-entropy alloys via tailoring stacking fault energy and critical twinning stress

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

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