Ultrastrong duplex high-entropy alloy with 2 GPa cryogenic strength enabled by an accelerated martensitic transformation

Dong Geun Kim; Yong Hee Jo; Junha Yang; Won Mi Choi; Hyoung Seop Kim; Byeong Joo Lee; Seok Su Sohn; Sunghak Lee

doi:10.1016/j.scriptamat.2019.06.026

Ultrastrong duplex high-entropy alloy with 2 GPa cryogenic strength enabled by an accelerated martensitic transformation

Dong Geun Kim, Yong Hee Jo, Junha Yang, Won Mi Choi, Hyoung Seop Kim, Byeong Joo Lee, Seok Su Sohn, Sunghak Lee

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

74 Citations (Scopus)

Abstract

The existing deformation-induced martensitic transformation mostly focuses on overcoming the trade-off of cryogenic strength-ductility; however, an enhancement of cryogenic strength further is still challenging. We present a concept to yield a cryogenic strength of 2 GPa in a duplex V₁₀Cr₁₀Co₃₀Fe₅₀ alloy. We adopt a thermodynamic calculation to reduce the stability of metastable face-centered-cubic (FCC) matrix, significantly promoting the martensitic transformation. In conjunction with the chemically driven promotion, the duplex structure including athermal body-centered-cubic (BCC) martensite enables mechanical strain partitioning to accelerate the transformation further. This finding could be an appropriate design strategy to develop new ultrastrong alloys for cryogenic applications.

Original language	English
Pages (from-to)	67-72
Number of pages	6
Journal	Scripta Materialia
Volume	171
DOIs	https://doi.org/10.1016/j.scriptamat.2019.06.026
Publication status	Published - 2019 Oct

Bibliographical note

Funding Information:
This work was supported by the Korea University Grant for the seventh author, by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT ( NRF–2016M3D1A1023383 ), and by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials .

Publisher Copyright:
© 2019 Acta Materialia Inc.

Keywords

Cryogenic strength
High-entropy alloy
Phase stability
Strain hardening
Transformation induced plasticity

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2019.06.026

Cite this

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title = "Ultrastrong duplex high-entropy alloy with 2 GPa cryogenic strength enabled by an accelerated martensitic transformation",

abstract = "The existing deformation-induced martensitic transformation mostly focuses on overcoming the trade-off of cryogenic strength-ductility; however, an enhancement of cryogenic strength further is still challenging. We present a concept to yield a cryogenic strength of 2 GPa in a duplex V10Cr10Co30Fe50 alloy. We adopt a thermodynamic calculation to reduce the stability of metastable face-centered-cubic (FCC) matrix, significantly promoting the martensitic transformation. In conjunction with the chemically driven promotion, the duplex structure including athermal body-centered-cubic (BCC) martensite enables mechanical strain partitioning to accelerate the transformation further. This finding could be an appropriate design strategy to develop new ultrastrong alloys for cryogenic applications.",

keywords = "Cryogenic strength, High-entropy alloy, Phase stability, Strain hardening, Transformation induced plasticity",

author = "Kim, {Dong Geun} and Jo, {Yong Hee} and Junha Yang and Choi, {Won Mi} and Kim, {Hyoung Seop} and Lee, {Byeong Joo} and Sohn, {Seok Su} and Sunghak Lee",

note = "Funding Information: This work was supported by the Korea University Grant for the seventh author, by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT ( NRF–2016M3D1A1023383 ), and by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials . Publisher Copyright: {\textcopyright} 2019 Acta Materialia Inc.",

year = "2019",

month = oct,

doi = "10.1016/j.scriptamat.2019.06.026",

language = "English",

volume = "171",

pages = "67--72",

journal = "Scripta Materialia",

issn = "1359-6462",

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AU - Kim, Dong Geun

AU - Jo, Yong Hee

AU - Yang, Junha

AU - Choi, Won Mi

AU - Kim, Hyoung Seop

AU - Lee, Byeong Joo

AU - Sohn, Seok Su

AU - Lee, Sunghak

N1 - Funding Information: This work was supported by the Korea University Grant for the seventh author, by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT ( NRF–2016M3D1A1023383 ), and by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials . Publisher Copyright: © 2019 Acta Materialia Inc.

PY - 2019/10

Y1 - 2019/10

N2 - The existing deformation-induced martensitic transformation mostly focuses on overcoming the trade-off of cryogenic strength-ductility; however, an enhancement of cryogenic strength further is still challenging. We present a concept to yield a cryogenic strength of 2 GPa in a duplex V10Cr10Co30Fe50 alloy. We adopt a thermodynamic calculation to reduce the stability of metastable face-centered-cubic (FCC) matrix, significantly promoting the martensitic transformation. In conjunction with the chemically driven promotion, the duplex structure including athermal body-centered-cubic (BCC) martensite enables mechanical strain partitioning to accelerate the transformation further. This finding could be an appropriate design strategy to develop new ultrastrong alloys for cryogenic applications.

AB - The existing deformation-induced martensitic transformation mostly focuses on overcoming the trade-off of cryogenic strength-ductility; however, an enhancement of cryogenic strength further is still challenging. We present a concept to yield a cryogenic strength of 2 GPa in a duplex V10Cr10Co30Fe50 alloy. We adopt a thermodynamic calculation to reduce the stability of metastable face-centered-cubic (FCC) matrix, significantly promoting the martensitic transformation. In conjunction with the chemically driven promotion, the duplex structure including athermal body-centered-cubic (BCC) martensite enables mechanical strain partitioning to accelerate the transformation further. This finding could be an appropriate design strategy to develop new ultrastrong alloys for cryogenic applications.

KW - Cryogenic strength

KW - High-entropy alloy

KW - Phase stability

KW - Strain hardening

KW - Transformation induced plasticity

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SN - 1359-6462

VL - 171

SP - 67

EP - 72

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Ultrastrong duplex high-entropy alloy with 2 GPa cryogenic strength enabled by an accelerated martensitic transformation

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

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Cite this

Ultrastrong duplex high-entropy alloy with 2 GPa cryogenic strength enabled by an accelerated martensitic transformation

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this

Ultrastrong duplex high-entropy alloy with 2 GPa cryogenic strength enabled by an accelerated martensitic transformation