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Page 8 of 9 Xu et al. Microstructures 2023;3:2023015 https://dx.doi.org/10.20517/microstructures.2022.40

and 50.4 vol.%, respectively. The Ll lamellae in two EHEAs enriched in Co and Cr, while B2 phases in two
2
EHEAs enriched in Ni and Al but depleted in Cr and Co. Both EHEAs have a high ultimate strength of
~1200 MPa combined with good uniform ductility (> 9%). In the ~9% strained Co Cr 17.33 Ni 47.34 Al and
18
17.33
Co Cr Ni Al EHEAs, a high density of dislocations as well as stacking faults in the L1 lamellar, while no
47
2
17
19
17
obvious dislocations are detected in the B2 phases. Moreover, Trench-type microstructures and several
blocky phases with the cleavage character on the fracture surface show that brittle-type fracture in the BCC
phase is accompanied by a ductile fracture in the FCC phase of two EHEAs.
DECLARATIONS
Authors’ contributions
Design: Xu N
Experiments: Xu N, Huang Y, Cao Y
Data analysis: Xu N, Li S
Manuscript writing: Xu N, Li S Wang Yd
Manuscript revision and supervising: Li S, Wang Yd

Availability of data and materials
Not applicable.

Financial support and sponsorship
This work was financially supported by the National Natural Science Foundation of China (NSFC) (Nos.
52171098 and 51921001), the National High-level Personnel of Special Support Program (No.
ZYZZ2021001), and the Fundamental Research Funds for the Central Universities (No. FRF-BD-20-02B).

Conflicts of interest
All authors declared that there are no conflicts of interest.

Ethical approval and consent to participate
Not applicable.

Consent for publication
Not applicable.

Copyright
© The Author(s) 2023.

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