Effect of carbon on cryogenic tensile behavior of CoCrFeMnNi-type high entropy alloys

High entropy alloys (HEAs) with a face-centered cubic (fcc) structure are considered as promising structural materials, in particular due to their impressive ductility and toughness at cryogenic temperature; at the same time strength of these HEAs is often quite low. An addition of interstitial elem...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-11, Vol.811, p.152000, Article 152000
Main Authors: Klimova, M.V., Semenyuk, A.O., Shaysultanov, D.G., Salishchev, G.A., Zherebtsov, S.V., Stepanov, N.D.
Format: Article
Language:English
Subjects:
Alloys
Carbon
Carbon content
Cryogenic effects
Cryogenic properties
Cryogenic temperature
Dislocations
Ductility
High entropy alloys
Inclination
Interstitial alloys
Mechanical properties
Microstructure
Plastic deformation
Segregations
Slip
Solid solutions
Solution strengthening
Transmission electron microscopy
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Summary:High entropy alloys (HEAs) with a face-centered cubic (fcc) structure are considered as promising structural materials, in particular due to their impressive ductility and toughness at cryogenic temperature; at the same time strength of these HEAs is often quite low. An addition of interstitial elements like carbon substantially increases the strength of the fcc HEAs at room temperature, however the effect of C on cryogenic properties has not been properly studied. Therefore in this work we examined cryogenic tensile behavior of the fcc high entropy alloys with different carbon content (0–2 at.%). The alloys had non-equiatomic proportions of principal elements, i.e. Co1Cr0.25Fe1Mn1Ni1. The lower Cr concentration in comparison with the equiatomic alloy led to the higher solubility of carbon confirmed by both ThermoCalc calculations and experimental results; only in the alloy with 2 at.% C a small (
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.152000