Effects of transformation-induced plasticity (TRIP) on tensile property improvement of Fe45Co30Cr10V10Ni5-xMnx high-entropy alloys

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

doi:10.1016/j.msea.2019.138809

Effects of transformation-induced plasticity (TRIP) on tensile property improvement of Fe₄₅Co₃₀Cr₁₀V₁₀Ni_5-xMn_x high-entropy alloys

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

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

77 Citations (Scopus)

Abstract

A new metastable high-entropy alloy (HEA) system was suggested by thermodynamic calculations based on the Gibbs free energies of FCC and HCP and the associated stacking fault energy (SFE). The Fe₄₅Co₃₀Cr₁₀V₁₀Ni_5-xMn_x (x = 0, 2.5, and 5 at.%) alloys were fabricated, and their tensile properties were evaluated at room and cryogenic temperatures. The relationship between the deformation mechanism and strain hardening behavior was investigated to reveal the role of deformation-induced martensitic transformation on tensile properties. The difference in Gibbs energy decreases with increasing Mn content, leading to the decreased SFE in sequence. At room temperature, ~60% of BCC martensite in the 5Mn HEA contributes effectively to the steady strain hardening, suppressing the plastic instability. This TRIP effect achieves much eminence in the cryogenic deformation, enabling the tensile strength to reach over 1.6 GPa due to 100% of BCC and HCP martensite. In addition to the fraction of martensite, the increased Mn content reduces a critical strain required to trigger the martensitic transformation and then raises the transformation rate. The present findings may provide a guide for the design of metastable HEAs to enhance tensile properties for cryogenic applications through adjusting SFE and TRIP effect.

Original language	English
Article number	138809
Journal	Materials Science and Engineering A
Volume	772
DOIs	https://doi.org/10.1016/j.msea.2019.138809
Publication status	Published - 2020 Jan 20

Bibliographical note

Funding Information:
This work was supported by the Korea University Grant for the seventh author, by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF- 2019R1F1A1057687 ), by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (NRF- 2016M3D1A1023383 ), by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials, and by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea government (MOTIE) ( P0002019, The Competency Development Program for Industry Specialist). Appendix A

Funding Information:
This work was supported by the Korea University Grant for the seventh author, by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2019R1F1A1057687), by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (NRF-2016M3D1A1023383), by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials, and by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea government (MOTIE) (P0002019, The Competency Development Program for Industry Specialist).

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

High-entropy alloy (HEA)
Stacking fault energy (SFE)
Thermodynamic calculation
Transformation-induced plasticity (TRIP)

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/j.msea.2019.138809

Cite this

@article{7ce5437d8e7a4e73b4b46c9893af004d,

title = "Effects of transformation-induced plasticity (TRIP) on tensile property improvement of Fe45Co30Cr10V10Ni5-xMnx high-entropy alloys",

abstract = "A new metastable high-entropy alloy (HEA) system was suggested by thermodynamic calculations based on the Gibbs free energies of FCC and HCP and the associated stacking fault energy (SFE). The Fe45Co30Cr10V10Ni5-xMnx (x = 0, 2.5, and 5 at.%) alloys were fabricated, and their tensile properties were evaluated at room and cryogenic temperatures. The relationship between the deformation mechanism and strain hardening behavior was investigated to reveal the role of deformation-induced martensitic transformation on tensile properties. The difference in Gibbs energy decreases with increasing Mn content, leading to the decreased SFE in sequence. At room temperature, ~60% of BCC martensite in the 5Mn HEA contributes effectively to the steady strain hardening, suppressing the plastic instability. This TRIP effect achieves much eminence in the cryogenic deformation, enabling the tensile strength to reach over 1.6 GPa due to 100% of BCC and HCP martensite. In addition to the fraction of martensite, the increased Mn content reduces a critical strain required to trigger the martensitic transformation and then raises the transformation rate. The present findings may provide a guide for the design of metastable HEAs to enhance tensile properties for cryogenic applications through adjusting SFE and TRIP effect.",

keywords = "High-entropy alloy (HEA), Stacking fault energy (SFE), Thermodynamic calculation, Transformation-induced plasticity (TRIP)",

author = "Junha Yang and Jo, {Yong Hee} and Kim, {Dae Woong} 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 the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF- 2019R1F1A1057687 ), by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (NRF- 2016M3D1A1023383 ), by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials, and by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea government (MOTIE) ( P0002019, The Competency Development Program for Industry Specialist). Appendix A Funding Information: This work was supported by the Korea University Grant for the seventh author, by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2019R1F1A1057687), by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (NRF-2016M3D1A1023383), by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials, and by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea government (MOTIE) (P0002019, The Competency Development Program for Industry Specialist). Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

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T1 - Effects of transformation-induced plasticity (TRIP) on tensile property improvement of Fe45Co30Cr10V10Ni5-xMnx high-entropy alloys

AU - Yang, Junha

AU - Jo, Yong Hee

AU - Kim, Dae Woong

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 the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF- 2019R1F1A1057687 ), by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (NRF- 2016M3D1A1023383 ), by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials, and by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea government (MOTIE) ( P0002019, The Competency Development Program for Industry Specialist). Appendix A Funding Information: This work was supported by the Korea University Grant for the seventh author, by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2019R1F1A1057687), by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (NRF-2016M3D1A1023383), by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials, and by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea government (MOTIE) (P0002019, The Competency Development Program for Industry Specialist). Publisher Copyright: © 2019 Elsevier B.V.

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N2 - A new metastable high-entropy alloy (HEA) system was suggested by thermodynamic calculations based on the Gibbs free energies of FCC and HCP and the associated stacking fault energy (SFE). The Fe45Co30Cr10V10Ni5-xMnx (x = 0, 2.5, and 5 at.%) alloys were fabricated, and their tensile properties were evaluated at room and cryogenic temperatures. The relationship between the deformation mechanism and strain hardening behavior was investigated to reveal the role of deformation-induced martensitic transformation on tensile properties. The difference in Gibbs energy decreases with increasing Mn content, leading to the decreased SFE in sequence. At room temperature, ~60% of BCC martensite in the 5Mn HEA contributes effectively to the steady strain hardening, suppressing the plastic instability. This TRIP effect achieves much eminence in the cryogenic deformation, enabling the tensile strength to reach over 1.6 GPa due to 100% of BCC and HCP martensite. In addition to the fraction of martensite, the increased Mn content reduces a critical strain required to trigger the martensitic transformation and then raises the transformation rate. The present findings may provide a guide for the design of metastable HEAs to enhance tensile properties for cryogenic applications through adjusting SFE and TRIP effect.

AB - A new metastable high-entropy alloy (HEA) system was suggested by thermodynamic calculations based on the Gibbs free energies of FCC and HCP and the associated stacking fault energy (SFE). The Fe45Co30Cr10V10Ni5-xMnx (x = 0, 2.5, and 5 at.%) alloys were fabricated, and their tensile properties were evaluated at room and cryogenic temperatures. The relationship between the deformation mechanism and strain hardening behavior was investigated to reveal the role of deformation-induced martensitic transformation on tensile properties. The difference in Gibbs energy decreases with increasing Mn content, leading to the decreased SFE in sequence. At room temperature, ~60% of BCC martensite in the 5Mn HEA contributes effectively to the steady strain hardening, suppressing the plastic instability. This TRIP effect achieves much eminence in the cryogenic deformation, enabling the tensile strength to reach over 1.6 GPa due to 100% of BCC and HCP martensite. In addition to the fraction of martensite, the increased Mn content reduces a critical strain required to trigger the martensitic transformation and then raises the transformation rate. The present findings may provide a guide for the design of metastable HEAs to enhance tensile properties for cryogenic applications through adjusting SFE and TRIP effect.

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KW - Stacking fault energy (SFE)

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