TY - JOUR
T1 - Compositional stability in medium and high-entropy alloys of CoCrFeMnNi system under ion irradiation
AU - Xu, Q.
AU - Guan, H. Q.
AU - Huang, S. S.
AU - Zhong, Z. H.
AU - Watanabe, H.
AU - Tokitani, M.
N1 - Funding Information:
Brandi Steidley, Colorado Department of Public Health and Environment; Justin Honce, University of Colorado School of Medicine; Alex Greninger, University of Washington.
Funding Information:
All authors have completed and submitted the International Committee of Medical Journal Editors form for disclosure of potential conflicts of interest. Daniel M. Pastula reports receipt of honoraria from the American Academy of Neurology for lectures. Amanda L. Piquet reports institutional support from Genentech, the University of Colorado, and the Rocky Mountain MS Center, royalties from Springer Nature for editorial services, consulting fees from Alexion and Genentech/Roche, honoraria from the American Academy of Neurology for educational lectures and from Medlink for a medical article, payment for expert testimony for the U.S. Department of Health and Human Services National Vaccination Injury Compensation Program from Sands Anderson, PC and from Joe Jones Law Firm, PLLC for medicolegal work, and institutional compensation for participation on a Genentech/Roche data safety monitoring board. J. David Beckham reports grants from the National Institutes of Health, National Institute of Neurological Disorders and Stroke, the National Institute for Allergy and Infectious Diseases, Roche Diagnostics, and VAMerit. Rebecca N. Kumar reports institutional grants or contracts from Regeneron and District of Columbia Department of Health, honoraria from AstraZeneca for a presentation, and a leadership role in the Infectious Disease Community of the International Society for Heart and Lung Transplantation. Princy N. Kumar reports institutional grants or contracts from Lilly, GSK, Merck, Regeneron, Gilead Sciences, Inc., American Gene Technologies, and Biohaven Pharmaceuticals; compensation for participation on Data Safety Monitoring or Advisory Boards for Johnson & Johnson, ViiV Healthcare, Gilead Sciences, Inc., and Theratechnologies, Inc.; and owns stock or stock options in Merck, Johnson & Johnson, GSK, Gilead Sciences, Inc., Pfizer, and Moderna. No other potential conflicts of interest were disclosed.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/12/5
Y1 - 2022/12/5
N2 - The equiatomic high-entropy alloy (HEA) CoCrFeMnNi not only has excellent mechanical properties but also good irradiation resistance. However, the mechanical properties of some equiatomic medium-entropy alloys (MEAs) are superior to those of CoCrFeMnNi HEA. In this study, the irradiation resistance and changes in composition due to irradiation in CoCrNi and CoCrFeNi MEAs and CoCrFeMnNi HEA are investigated. Thin film samples of the MEAs and HEA and Ni used for comparison were irradiated with up to 1.7 × 1019 ions/m2 of 2.4 MeV Cu ions at 673 and 873 K. The average damage in the observed area was 1 displacement per atom (dpa). No voids were observed in any of the MEA and HEA samples even after irradiation at 873 K; however, large voids were formed in Ni irradiated at 873 K. This indicates that the irradiation resistance of CoCrNi and CoCrFeNi MEAs and CoCrFeMnNi HEA was better than that of Ni. In addition, the formation of stacking fault tetrahedra (SFTs), a type of vacancy cluster, at 873 K was much more pronounced in CoCrNi and CoCrFeNi MEAs than in CoCrFeMnNi HEA. Therefore, the irradiation resistance of CoCrNi and CoCrFeNi MEAs is lower than that of CoCrFeMnNi HEA. Moreover, significant Cr segregation occurred in the CoCrNi and CoCrFeNi MEA samples irradiated at 873 K. In contrast, no segregation occurred in CoCrFeMnNi HEA. First-principles calculation results show that the formation rate of Cr-dumbbells is higher in CoCrNi and CoCrFeNi MEAs than in CoCrFeMnNi HEA, and that Cr interstitials are more stable in the MEAs. Therefore, Cr segregation is more likely to occur in the MEAs. Element segregation may affect the irradiation resistance of the alloys.
AB - The equiatomic high-entropy alloy (HEA) CoCrFeMnNi not only has excellent mechanical properties but also good irradiation resistance. However, the mechanical properties of some equiatomic medium-entropy alloys (MEAs) are superior to those of CoCrFeMnNi HEA. In this study, the irradiation resistance and changes in composition due to irradiation in CoCrNi and CoCrFeNi MEAs and CoCrFeMnNi HEA are investigated. Thin film samples of the MEAs and HEA and Ni used for comparison were irradiated with up to 1.7 × 1019 ions/m2 of 2.4 MeV Cu ions at 673 and 873 K. The average damage in the observed area was 1 displacement per atom (dpa). No voids were observed in any of the MEA and HEA samples even after irradiation at 873 K; however, large voids were formed in Ni irradiated at 873 K. This indicates that the irradiation resistance of CoCrNi and CoCrFeNi MEAs and CoCrFeMnNi HEA was better than that of Ni. In addition, the formation of stacking fault tetrahedra (SFTs), a type of vacancy cluster, at 873 K was much more pronounced in CoCrNi and CoCrFeNi MEAs than in CoCrFeMnNi HEA. Therefore, the irradiation resistance of CoCrNi and CoCrFeNi MEAs is lower than that of CoCrFeMnNi HEA. Moreover, significant Cr segregation occurred in the CoCrNi and CoCrFeNi MEA samples irradiated at 873 K. In contrast, no segregation occurred in CoCrFeMnNi HEA. First-principles calculation results show that the formation rate of Cr-dumbbells is higher in CoCrNi and CoCrFeNi MEAs than in CoCrFeMnNi HEA, and that Cr interstitials are more stable in the MEAs. Therefore, Cr segregation is more likely to occur in the MEAs. Element segregation may affect the irradiation resistance of the alloys.
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U2 - 10.1016/j.jallcom.2022.166697
DO - 10.1016/j.jallcom.2022.166697
M3 - Article
AN - SCOPUS:85135914732
SN - 0925-8388
VL - 925
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 166697
ER -