https://orcid.org/0000-0002-6078-8325
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Abstract
Herein, we showed that controlled additions of Al, which provided a certain degree of B2 ordering, resulted in a ∼ 37%-enhancement of both yield strength and uniform elongation in Alx(NbTiZr)100-x (x = 0; 2.5; 5; 7.5 at.%) refractory medium-entropy alloys. The improvement of properties stemmed from the solid solution and short-range order strengthening, as well as from the alteration in a character of dislocation glide. The B2 ordering caused the formation of multiple dislocation bands and the activation of cross-slip, which improved the macroscopic stability of plastic flow and extended the strengthening stage, thereby postponing necking.
GRAPHICAL ABSTRACT
IMPACT STATEMENT
Controlled Al-induced B2 ordering helps overcome the strength-ductility dilemma in refractory medium-entropy alloys due to solid solution and short-range strengthening coupled with the dislocation motion changing.
Data availability statement
The data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgements
The work was carried out using the equipment of the Joint Research Center of Belgorod State National Research University «Technology and Materials» with financial support from the Ministry of Science and Higher Education of the Russian Federation within the framework of agreement No. 075-15-2021-690 (unique identifier for the project RF-2296.61321X0030). The authors also thank Dr R. Eleti, Indian Institute of Technology Roorkee, for fruitful discussions, especially concerning the calculation of apparent activation volumes, and Dr S. Naumov, Belgorod National Research University, for aid in preparing the ingots of the alloys.
Disclosure statement
No potential conflict of interest was reported by the author(s).