Tailoring microstructures of CoCrFeNiNb0.25 hypoeutectic high-entropy alloy by hot deformation

CoCrFeNiNb 0.25 hypoeutectic high-entropy alloy (HEA) has shown good mechanical properties. However, due to interdendritic eutectics, it is challenging to further optimize the microstructure through cold rolling and annealing. The current study showed that hot deformation effectively tailored the hy...

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Bibliographic Details
Published in:Rare metals 2022, Vol.41 (6), p.2028-2037
Main Authors: Liu, Xiao-Rong, He, Feng, Li, Jun-Jie, Dang, Ying-Ying, Wang, Zhi-Jun, Wang, Jin-Cheng
Format: Article
Language:English
Subjects:
Biomaterials
Chemistry and Materials Science
Cold rolling
Deformation
Deformation effects
Energy
High entropy alloys
Laves phase
Materials Engineering
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Nanoscale Science and Technology
Original Article
Physical Chemistry
Strain rate
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Summary:CoCrFeNiNb 0.25 hypoeutectic high-entropy alloy (HEA) has shown good mechanical properties. However, due to interdendritic eutectics, it is challenging to further optimize the microstructure through cold rolling and annealing. The current study showed that hot deformation effectively tailored the hypoeutectic microstructure. We investigated the hot deformation behavior and microstructure evolution of the dual-phase CoCrFeNiNb 0.25 HEA at different temperatures from 800 to 1000 °C and different strain rates from 0.01 to 10.00 s −1 . The systematic investigation showed the deformation activation energy around 500 kJ·mol −1 . Microstructure with refined grains and uniformly distributed Laves phases can be obtained after 70% compression at 900 °C with a strain rate of 0.01 s −1 . Graphical abstract
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-021-01932-9