Analysis of damage-tolerance of TRIP-assisted V10Cr10Fe45Co30Ni5 high-entropy alloy at room and cryogenic temperatures

Yong Hee Jo; Junha Yang; Kyung Yeon Doh; Woojin An; Dae Woong Kim; Hyokyung Sung; Donghwa Lee; Hyoung Seop Kim; Seok Su Sohn; Sunghak Lee

doi:10.1016/j.jallcom.2020.156090

Analysis of damage-tolerance of TRIP-assisted V₁₀Cr₁₀Fe₄₅Co₃₀Ni₅ high-entropy alloy at room and cryogenic temperatures

Yong Hee Jo, Junha Yang, Kyung Yeon Doh, Woojin An, Dae Woong Kim, Hyokyung Sung, Donghwa Lee, Hyoung Seop Kim, Seok Su Sohn, Sunghak Lee

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

64 Citations (Scopus)

Abstract

A single-phase face-centered-cubic (FCC) high- or medium-entropy alloys (HEAs or MEAs) have attracted great attentions due to their novel damage-tolerance properties (strength, ductility, and fracture toughness) by generating nano-twins at cryogenic temperature. The fracture toughness assessment is essential for evaluating the reliability of high-performance materials for cryogenic applications; however, fracture studies on single-phase FCC HEAs showing transformation-induced plasticity (TRIP) have been hardly conducted. In this study, thus, damage-tolerance mechanisms of a V₁₀Cr₁₀Fe₄₅Co₃₀Ni₅ HEA showing the FCC to body-centered-cubic (BCC) TRIP were investigated at room and cryogenic temperatures. At room temperature (298 K), the alloy shows the tensile strength of 731 MPa, elongation of 40%, and fracture toughness (K_JIc) of 230 MPa m^1/2. At cryogenic temperature (77 K), the strength and elongation improve to 1.2 GPa and 66%, respectively, while the K_JIc remains almost constant at 237 MPa m^1/2. Dislocation-mediated plasticity prevails at 298 K; however, the TRIP from FCC to BCC occurs at 77 K. Deformation and fracture mechanisms are analyzed by stacking fault energies and differences in Gibbs free energies between phases calculated by ab-initio methods, and are compared to those of CrMnFeCoNi, CrCoNi, Fe₅₀Mn₃₀Co₁₀Cr₁₀, and V₁₀Cr₁₀Fe₄₅Co₂₀Ni₁₅ alloys. Despite the presence of a considerable amount of BCC which is intrinsically brittle at low temperature, the transformed BCC martensite shows ductile fracture after the fracture toughness test even in cryogenic environments. These results demonstrate that the FCC to BCC TRIP can be an attractive route in a field of HEA design to overcome the strength and toughness trade-off at cryogenic temperature.

Original language	English
Article number	156090
Journal	Journal of Alloys and Compounds
Volume	844
DOIs	https://doi.org/10.1016/j.jallcom.2020.156090
Publication status	Published - 2020 Dec 5

Bibliographical note

Funding Information:
This work was supported by the Korea University Grant for Prof. S.S. Sohn, by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (2016M3D1A1023384), and by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials. The authors would like to gratefully acknowledge the kind support of Dr. W.-M. Choi and Professor B.-J. Lee at the POSTECH.

Funding Information:
This work was supported by the Korea University Grant for Prof. S.S. Sohn, by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT ( 2016M3D1A1023384 ), and by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials. The authors would like to gratefully acknowledge the kind support of Dr. W.-M. Choi and Professor B.-J. Lee at the POSTECH.

Publisher Copyright:
© 2020 Elsevier B.V.

Keywords

Cryogenic temperature
Fracture toughness
High-entropy alloy (HEA)
Stacking fault energy
Transformation-induced plasticity (TRIP)

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2020.156090

Cite this

@article{53f7247b9ee348a18f58811ba6228121,

title = "Analysis of damage-tolerance of TRIP-assisted V10Cr10Fe45Co30Ni5 high-entropy alloy at room and cryogenic temperatures",

abstract = "A single-phase face-centered-cubic (FCC) high- or medium-entropy alloys (HEAs or MEAs) have attracted great attentions due to their novel damage-tolerance properties (strength, ductility, and fracture toughness) by generating nano-twins at cryogenic temperature. The fracture toughness assessment is essential for evaluating the reliability of high-performance materials for cryogenic applications; however, fracture studies on single-phase FCC HEAs showing transformation-induced plasticity (TRIP) have been hardly conducted. In this study, thus, damage-tolerance mechanisms of a V10Cr10Fe45Co30Ni5 HEA showing the FCC to body-centered-cubic (BCC) TRIP were investigated at room and cryogenic temperatures. At room temperature (298 K), the alloy shows the tensile strength of 731 MPa, elongation of 40%, and fracture toughness (KJIc) of 230 MPa m1/2. At cryogenic temperature (77 K), the strength and elongation improve to 1.2 GPa and 66%, respectively, while the KJIc remains almost constant at 237 MPa m1/2. Dislocation-mediated plasticity prevails at 298 K; however, the TRIP from FCC to BCC occurs at 77 K. Deformation and fracture mechanisms are analyzed by stacking fault energies and differences in Gibbs free energies between phases calculated by ab-initio methods, and are compared to those of CrMnFeCoNi, CrCoNi, Fe50Mn30Co10Cr10, and V10Cr10Fe45Co20Ni15 alloys. Despite the presence of a considerable amount of BCC which is intrinsically brittle at low temperature, the transformed BCC martensite shows ductile fracture after the fracture toughness test even in cryogenic environments. These results demonstrate that the FCC to BCC TRIP can be an attractive route in a field of HEA design to overcome the strength and toughness trade-off at cryogenic temperature.",

keywords = "Cryogenic temperature, Fracture toughness, High-entropy alloy (HEA), Stacking fault energy, Transformation-induced plasticity (TRIP)",

author = "Jo, {Yong Hee} and Junha Yang and Doh, {Kyung Yeon} and Woojin An and Kim, {Dae Woong} and Hyokyung Sung and Donghwa Lee and Kim, {Hyoung Seop} and Sohn, {Seok Su} and Sunghak Lee",

note = "Funding Information: This work was supported by the Korea University Grant for Prof. S.S. Sohn, by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (2016M3D1A1023384), and by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials. The authors would like to gratefully acknowledge the kind support of Dr. W.-M. Choi and Professor B.-J. Lee at the POSTECH. Funding Information: This work was supported by the Korea University Grant for Prof. S.S. Sohn, by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT ( 2016M3D1A1023384 ), and by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials. The authors would like to gratefully acknowledge the kind support of Dr. W.-M. Choi and Professor B.-J. Lee at the POSTECH. Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2020",

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doi = "10.1016/j.jallcom.2020.156090",

language = "English",

volume = "844",

journal = "Journal of Alloys and Compounds",

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T1 - Analysis of damage-tolerance of TRIP-assisted V10Cr10Fe45Co30Ni5 high-entropy alloy at room and cryogenic temperatures

AU - Jo, Yong Hee

AU - Yang, Junha

AU - Doh, Kyung Yeon

AU - An, Woojin

AU - Kim, Dae Woong

AU - Sung, Hyokyung

AU - Lee, Donghwa

AU - Kim, Hyoung Seop

AU - Sohn, Seok Su

AU - Lee, Sunghak

N1 - Funding Information: This work was supported by the Korea University Grant for Prof. S.S. Sohn, by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (2016M3D1A1023384), and by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials. The authors would like to gratefully acknowledge the kind support of Dr. W.-M. Choi and Professor B.-J. Lee at the POSTECH. Funding Information: This work was supported by the Korea University Grant for Prof. S.S. Sohn, by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT ( 2016M3D1A1023384 ), and by the Brain Korea 21 PLUS Project for Center for Creative Industrial Materials. The authors would like to gratefully acknowledge the kind support of Dr. W.-M. Choi and Professor B.-J. Lee at the POSTECH. Publisher Copyright: © 2020 Elsevier B.V.

PY - 2020/12/5

Y1 - 2020/12/5

N2 - A single-phase face-centered-cubic (FCC) high- or medium-entropy alloys (HEAs or MEAs) have attracted great attentions due to their novel damage-tolerance properties (strength, ductility, and fracture toughness) by generating nano-twins at cryogenic temperature. The fracture toughness assessment is essential for evaluating the reliability of high-performance materials for cryogenic applications; however, fracture studies on single-phase FCC HEAs showing transformation-induced plasticity (TRIP) have been hardly conducted. In this study, thus, damage-tolerance mechanisms of a V10Cr10Fe45Co30Ni5 HEA showing the FCC to body-centered-cubic (BCC) TRIP were investigated at room and cryogenic temperatures. At room temperature (298 K), the alloy shows the tensile strength of 731 MPa, elongation of 40%, and fracture toughness (KJIc) of 230 MPa m1/2. At cryogenic temperature (77 K), the strength and elongation improve to 1.2 GPa and 66%, respectively, while the KJIc remains almost constant at 237 MPa m1/2. Dislocation-mediated plasticity prevails at 298 K; however, the TRIP from FCC to BCC occurs at 77 K. Deformation and fracture mechanisms are analyzed by stacking fault energies and differences in Gibbs free energies between phases calculated by ab-initio methods, and are compared to those of CrMnFeCoNi, CrCoNi, Fe50Mn30Co10Cr10, and V10Cr10Fe45Co20Ni15 alloys. Despite the presence of a considerable amount of BCC which is intrinsically brittle at low temperature, the transformed BCC martensite shows ductile fracture after the fracture toughness test even in cryogenic environments. These results demonstrate that the FCC to BCC TRIP can be an attractive route in a field of HEA design to overcome the strength and toughness trade-off at cryogenic temperature.

AB - A single-phase face-centered-cubic (FCC) high- or medium-entropy alloys (HEAs or MEAs) have attracted great attentions due to their novel damage-tolerance properties (strength, ductility, and fracture toughness) by generating nano-twins at cryogenic temperature. The fracture toughness assessment is essential for evaluating the reliability of high-performance materials for cryogenic applications; however, fracture studies on single-phase FCC HEAs showing transformation-induced plasticity (TRIP) have been hardly conducted. In this study, thus, damage-tolerance mechanisms of a V10Cr10Fe45Co30Ni5 HEA showing the FCC to body-centered-cubic (BCC) TRIP were investigated at room and cryogenic temperatures. At room temperature (298 K), the alloy shows the tensile strength of 731 MPa, elongation of 40%, and fracture toughness (KJIc) of 230 MPa m1/2. At cryogenic temperature (77 K), the strength and elongation improve to 1.2 GPa and 66%, respectively, while the KJIc remains almost constant at 237 MPa m1/2. Dislocation-mediated plasticity prevails at 298 K; however, the TRIP from FCC to BCC occurs at 77 K. Deformation and fracture mechanisms are analyzed by stacking fault energies and differences in Gibbs free energies between phases calculated by ab-initio methods, and are compared to those of CrMnFeCoNi, CrCoNi, Fe50Mn30Co10Cr10, and V10Cr10Fe45Co20Ni15 alloys. Despite the presence of a considerable amount of BCC which is intrinsically brittle at low temperature, the transformed BCC martensite shows ductile fracture after the fracture toughness test even in cryogenic environments. These results demonstrate that the FCC to BCC TRIP can be an attractive route in a field of HEA design to overcome the strength and toughness trade-off at cryogenic temperature.

KW - Cryogenic temperature

KW - Fracture toughness

KW - High-entropy alloy (HEA)

KW - Stacking fault energy

KW - Transformation-induced plasticity (TRIP)

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