Enhanced strength-ductility synergy in heterostructured metastable FeCoNiCrMo medium-entropy alloys

Jun Seok Lee; Pil Wook Shin; Peyman Asghari-Rad; Auezhan Amanov; Hyoung Seop Kim; Jae Wung Bae

doi:10.1016/j.msea.2025.149647

Enhanced strength-ductility synergy in heterostructured metastable FeCoNiCrMo medium-entropy alloys

Jun Seok Lee
, Pil Wook Shin
, Peyman Asghari-Rad
, Auezhan Amanov
, Hyoung Seop Kim
, Jae Wung Bae^*

^*Tämän työn vastaava kirjoittaja

Tutkimustuotos: Artikkeli › Tieteellinen › vertaisarvioitu

1 Sitaatiot (Scopus)

Abstrakti

In this study, ultrasonic nanocrystalline surface modification was applied to Fe₅₅Co₁₉Ni_8.5Cr_12.5Mo₅ (Co₁₉Ni_8.5) and Fe₅₅Co₂₀Ni₅Cr_12.5Mo_7.5 (Co₂₀Ni₅) medium-entropy alloys, resulting in a heterogeneous microstructure that enhanced the room-temperature yield strength by up to 82 % compared to the annealed condition with the aid of hetero-deformation-induced (HDI) strengthening. In particular, the lower FCC stability of the Co₂₀Ni₅ alloy relative to the Co₁₉Ni_8.5 alloy triggered a transition in the deformation mechanism—from twinning to deformation-induced phase transformation—thereby enhancing the HDI strengthening effect and further improving the strength-ductility synergy.

Alkuperäiskieli	Englanti
Artikkeli	149647
Julkaisu	Materials Science and Engineering: A
Vuosikerta	952
Varhainen verkossa julkaisun päivämäärä	jouluk. 2025
DOI - pysyväislinkit	https://doi.org/10.1016/j.msea.2025.149647
Tila	Julkaistu - helmik. 2026
OKM-julkaisutyyppi	A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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Jufo-taso 2

!!ASJC Scopus subject areas

Yleinen materiaalitiede
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.msea.2025.149647

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@article{24e2e2df6718419ea4663bc6907da30f,

title = "Enhanced strength-ductility synergy in heterostructured metastable FeCoNiCrMo medium-entropy alloys",

abstract = "In this study, ultrasonic nanocrystalline surface modification was applied to Fe55Co19Ni8.5Cr12.5Mo5 (Co19Ni8.5) and Fe55Co20Ni5Cr12.5Mo7.5 (Co20Ni5) medium-entropy alloys, resulting in a heterogeneous microstructure that enhanced the room-temperature yield strength by up to 82 \% compared to the annealed condition with the aid of hetero-deformation-induced (HDI) strengthening. In particular, the lower FCC stability of the Co20Ni5 alloy relative to the Co19Ni8.5 alloy triggered a transition in the deformation mechanism—from twinning to deformation-induced phase transformation—thereby enhancing the HDI strengthening effect and further improving the strength-ductility synergy.",

keywords = "Deformation mechanism, Heterogeneous microstructure, Medium-entropy alloy, Phase stability, Ultrasonic nanocrystalline surface modification",

author = "Lee, \{Jun Seok\} and Shin, \{Pil Wook\} and Peyman Asghari-Rad and Auezhan Amanov and Kim, \{Hyoung Seop\} and Bae, \{Jae Wung\}",

note = "Publisher Copyright: {\textcopyright} 2025",

year = "2026",

month = feb,

doi = "10.1016/j.msea.2025.149647",

language = "English",

volume = "952",

journal = "Materials Science and Engineering: A",

issn = "0921-5093",

publisher = "Elsevier",

}

TY - JOUR

T1 - Enhanced strength-ductility synergy in heterostructured metastable FeCoNiCrMo medium-entropy alloys

AU - Lee, Jun Seok

AU - Shin, Pil Wook

AU - Asghari-Rad, Peyman

AU - Amanov, Auezhan

AU - Kim, Hyoung Seop

AU - Bae, Jae Wung

PY - 2026/2

Y1 - 2026/2

N2 - In this study, ultrasonic nanocrystalline surface modification was applied to Fe55Co19Ni8.5Cr12.5Mo5 (Co19Ni8.5) and Fe55Co20Ni5Cr12.5Mo7.5 (Co20Ni5) medium-entropy alloys, resulting in a heterogeneous microstructure that enhanced the room-temperature yield strength by up to 82 % compared to the annealed condition with the aid of hetero-deformation-induced (HDI) strengthening. In particular, the lower FCC stability of the Co20Ni5 alloy relative to the Co19Ni8.5 alloy triggered a transition in the deformation mechanism—from twinning to deformation-induced phase transformation—thereby enhancing the HDI strengthening effect and further improving the strength-ductility synergy.

AB - In this study, ultrasonic nanocrystalline surface modification was applied to Fe55Co19Ni8.5Cr12.5Mo5 (Co19Ni8.5) and Fe55Co20Ni5Cr12.5Mo7.5 (Co20Ni5) medium-entropy alloys, resulting in a heterogeneous microstructure that enhanced the room-temperature yield strength by up to 82 % compared to the annealed condition with the aid of hetero-deformation-induced (HDI) strengthening. In particular, the lower FCC stability of the Co20Ni5 alloy relative to the Co19Ni8.5 alloy triggered a transition in the deformation mechanism—from twinning to deformation-induced phase transformation—thereby enhancing the HDI strengthening effect and further improving the strength-ductility synergy.

KW - Deformation mechanism

KW - Heterogeneous microstructure

KW - Medium-entropy alloy

KW - Phase stability

KW - Ultrasonic nanocrystalline surface modification

UR - https://www.scopus.com/pages/publications/105025027383

U2 - 10.1016/j.msea.2025.149647

DO - 10.1016/j.msea.2025.149647

M3 - Article

AN - SCOPUS:105025027383

SN - 0921-5093

VL - 952

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

M1 - 149647

ER -

Enhanced strength-ductility synergy in heterostructured metastable FeCoNiCrMo medium-entropy alloys

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