Cryogenic-temperature fracture toughness analysis of non-equi-atomic V10Cr10Fe45Co20Ni15 high-entropy alloy

Yong Hee Jo, Kyung Yeon Doh, Dong Geun Kim, Kwanho Lee, Dae Woong Kim, Hyokyung Sung, Seok S Sohn, Donghwa Lee, Hyoung Seop Kim, Byeong Joo Lee, Sunghak Lee

Research output: Contribution to journalArticle

Abstract

Representative face-centered-cubic (FCC) high-entropy alloys (HEAs) or medium-entropy alloys (MEAs), e.g., equi-atomic CoCrFeMnNi or CrCoNi alloys, have drawn many attentions due to the excellent damage-tolerance at cryogenic temperature. The investigation of fracture toughness at 77 K is basically required for the reliable evaluation of high-performance alloys used for cryogenic applications; however, it has been rarely carried out for the non-equi-atomic FCC HEAs yet. In this study, tensile and fracture toughness tests were conducted on the non-equi-atomic V10Cr10Fe45Co20Ni15 alloy, and the results were compared with those of the equi-atomic CoCrFeMnNi and CrCoNi alloys. The present alloy shows a good damage tolerance at cryogenic temperature with tensile strength of 1 GPa and elongation of ∼60%. The KJIc fracture toughness values are 219 and 232 MPa m1/2 at 298 and 77 K, respectively, showing the increase in toughness with decreasing temperature. This increase results from the absence of twins at 298 K and the increased propensity to twin formation at 77 K, which is well confirmed by the variation of stacking fault energies (SFEs) by using Ab-initio calculations. The mechanical properties of the present alloy are actually similar or slightly lower than those of the other CoNiCr or FeMnCoNiCr alloy; instead, this study provides that neither composition nor certain elements are the most important factors dictating damage-tolerance of HEAs or MEAs.

Original languageEnglish
Article number151864
JournalJournal of Alloys and Compounds
Volume809
DOIs
Publication statusPublished - 2019 Nov 15

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Cryogenics
Fracture toughness
Entropy
Damage tolerance
Temperature
Stacking faults
Toughness
Elongation
Tensile strength
Mechanical properties

Keywords

  • Ab-initio calculation
  • Cryogenic temperature
  • Fracture toughness
  • High-entropy alloy (HEA)
  • Stacking fault energy (SFE)

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Cryogenic-temperature fracture toughness analysis of non-equi-atomic V10Cr10Fe45Co20Ni15 high-entropy alloy. / Jo, Yong Hee; Doh, Kyung Yeon; Kim, Dong Geun; Lee, Kwanho; Kim, Dae Woong; Sung, Hyokyung; Sohn, Seok S; Lee, Donghwa; Kim, Hyoung Seop; Lee, Byeong Joo; Lee, Sunghak.

In: Journal of Alloys and Compounds, Vol. 809, 151864, 15.11.2019.

Research output: Contribution to journalArticle

Jo, Yong Hee ; Doh, Kyung Yeon ; Kim, Dong Geun ; Lee, Kwanho ; Kim, Dae Woong ; Sung, Hyokyung ; Sohn, Seok S ; Lee, Donghwa ; Kim, Hyoung Seop ; Lee, Byeong Joo ; Lee, Sunghak. / Cryogenic-temperature fracture toughness analysis of non-equi-atomic V10Cr10Fe45Co20Ni15 high-entropy alloy. In: Journal of Alloys and Compounds. 2019 ; Vol. 809.
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AU - Jo, Yong Hee

AU - Doh, Kyung Yeon

AU - Kim, Dong Geun

AU - Lee, Kwanho

AU - Kim, Dae Woong

AU - Sung, Hyokyung

AU - Sohn, Seok S

AU - Lee, Donghwa

AU - Kim, Hyoung Seop

AU - Lee, Byeong Joo

AU - Lee, Sunghak

PY - 2019/11/15

Y1 - 2019/11/15

N2 - Representative face-centered-cubic (FCC) high-entropy alloys (HEAs) or medium-entropy alloys (MEAs), e.g., equi-atomic CoCrFeMnNi or CrCoNi alloys, have drawn many attentions due to the excellent damage-tolerance at cryogenic temperature. The investigation of fracture toughness at 77 K is basically required for the reliable evaluation of high-performance alloys used for cryogenic applications; however, it has been rarely carried out for the non-equi-atomic FCC HEAs yet. In this study, tensile and fracture toughness tests were conducted on the non-equi-atomic V10Cr10Fe45Co20Ni15 alloy, and the results were compared with those of the equi-atomic CoCrFeMnNi and CrCoNi alloys. The present alloy shows a good damage tolerance at cryogenic temperature with tensile strength of 1 GPa and elongation of ∼60%. The KJIc fracture toughness values are 219 and 232 MPa m1/2 at 298 and 77 K, respectively, showing the increase in toughness with decreasing temperature. This increase results from the absence of twins at 298 K and the increased propensity to twin formation at 77 K, which is well confirmed by the variation of stacking fault energies (SFEs) by using Ab-initio calculations. The mechanical properties of the present alloy are actually similar or slightly lower than those of the other CoNiCr or FeMnCoNiCr alloy; instead, this study provides that neither composition nor certain elements are the most important factors dictating damage-tolerance of HEAs or MEAs.

AB - Representative face-centered-cubic (FCC) high-entropy alloys (HEAs) or medium-entropy alloys (MEAs), e.g., equi-atomic CoCrFeMnNi or CrCoNi alloys, have drawn many attentions due to the excellent damage-tolerance at cryogenic temperature. The investigation of fracture toughness at 77 K is basically required for the reliable evaluation of high-performance alloys used for cryogenic applications; however, it has been rarely carried out for the non-equi-atomic FCC HEAs yet. In this study, tensile and fracture toughness tests were conducted on the non-equi-atomic V10Cr10Fe45Co20Ni15 alloy, and the results were compared with those of the equi-atomic CoCrFeMnNi and CrCoNi alloys. The present alloy shows a good damage tolerance at cryogenic temperature with tensile strength of 1 GPa and elongation of ∼60%. The KJIc fracture toughness values are 219 and 232 MPa m1/2 at 298 and 77 K, respectively, showing the increase in toughness with decreasing temperature. This increase results from the absence of twins at 298 K and the increased propensity to twin formation at 77 K, which is well confirmed by the variation of stacking fault energies (SFEs) by using Ab-initio calculations. The mechanical properties of the present alloy are actually similar or slightly lower than those of the other CoNiCr or FeMnCoNiCr alloy; instead, this study provides that neither composition nor certain elements are the most important factors dictating damage-tolerance of HEAs or MEAs.

KW - Ab-initio calculation

KW - Cryogenic temperature

KW - Fracture toughness

KW - High-entropy alloy (HEA)

KW - Stacking fault energy (SFE)

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