Ultrahigh hardness with exceptional thermal stability of a nanocrystalline CoCrFeNiMn high-entropy alloy prepared by inert gas condensation

(CoCrFeNi)93.5Mn6.5 nanocrystalline high-entropy alloy (nc-HEA) with an average grain size of 25 nm was prepared by inert gas condensation (IGC) using a laser evaporation source. An unprecedented increment in hardness was found from 484 HV to 791 HV after annealing at 600 °C for 1 h. More surprising...

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Bibliographic Details
Published in:Scripta materialia 2020-10, Vol.187, p.335-339
Main Authors: Wang, Junjie, Wu, Shangshu, Fu, Shu, Liu, Sinan, Yan, Mengyang, Lai, Qingquan, Lan, Si, Hahn, Horst, Feng, Tao
Format: Article
Language:English
Subjects:
Hardness
Inert gas condensing
Laser
Microstructure
Nanocrystalline high-entropy alloy
Thermal stability
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Summary:(CoCrFeNi)93.5Mn6.5 nanocrystalline high-entropy alloy (nc-HEA) with an average grain size of 25 nm was prepared by inert gas condensation (IGC) using a laser evaporation source. An unprecedented increment in hardness was found from 484 HV to 791 HV after annealing at 600 °C for 1 h. More surprisingly, the original high hardness is maintained even after annealing at 1100 °C, which demonstrates superb thermal stability of the nc-HEA. The underlying strengthening mechanism is attributed to the unique microstructure of the nc-HEA and its evolution during annealing. This study provides a new preparation technique (laser-IGC) for high-performance nc-HEAs with great potential for applications. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2020.06.042