Impact of ECAP at 300 °C on the microstructure and mechanical properties of the quenched Zr–2.5%Nb alloy
https://doi.org/10.17073/0021-3438-2024-1-81-92
Abstract
We investigated the microstructure of the Zr–2.5%Nb zirconium alloy after subjecting it to equal-channel angular pressing (ECAP) and found that ECAP at 300 °C increases the strength by 140 to 180 %. Notably, unlike other studies, our alloy did not show complete dissolution of niobium particles, which may be due to the reduced diffusion rates at the lower deformation temperature of 300 °C. Pre-treatment involving quenching before severe plastic deformation was also studied, which developed a lamellar structure introducing additional boundaries that facilitated grain refinement during subsequent ECAP. The strength of the alloy was further enhanced by solid-solution hardening, achieved through the complete dissolution of the Nb particles into the matrix post-quenching. This process resulted in a 2.3-fold increase in yield strength after quenching plus ECAP compared to the initial coarse-grained state.
Keywords
microstructure,
quenching,
equal channel angular pressing,
strength,
Nb particles,
Zr–2.5%Nb zirconium alloy
Supporting agencies: This work was carried out with financial support from the Russian Science Foundation under Project № 20-79-10189-П, https://rscf.ru/en/project/23-79-50039/ Mechanical tests and microstructure studу were carried out in the Center for collective use «Nanotech» of Ufa University of Science and Technology.
About the Authors
D. V. Gunderov
Ufa University of Science and Technology; Institute of Molecule and Crystal Physics of the Ufa Federal Research Centre of the RAS
Russian Federation
Russian Federation
Dmitry V. Gunderov – Dr. Sci. (Phys.-Math.), Head Researcher of the Institute of Physics of Molecules and Crystals, Сhief Researcher
32 Zaki Validi Str., Ufa, Republic of Bashkortostan 450076;
71 Oktyabrya Prosp., Ufa, Republic of Bashkortostan 450054
A. G. Stotskiy
Ufa University of Science and Technology
Russian Federation
Russian Federation
Andrey G. Stotskiy – Junior Researcher
32 Zaki Validi Str., Ufa, Republic of Bashkortostan 450076
S. D. Gunderova
Ufa University of Science and Technology; Institute of Molecule and Crystal Physics of the Ufa Federal Research Centre of the RAS
Russian Federation
Russian Federation
Sofia D. Gunderova – Undergraduate Student of the Ufa University of Science and Technology, Research Laboratory Assistant
32 Zaki Validi Str., Ufa, Republic of Bashkortostan 450076;
71 Oktyabrya Prosp., Ufa, Republic of Bashkortostan 450054
V. R. Aubakirоva
Ufa University of Science and Technology
Russian Federation
Russian Federation
Veta R. Aubakirova – Cand. Sci. (Eng.), Senior Researcher
32 Zaki Validi Str., Ufa, Republic of Bashkortostan 450076
A. Yu. Demin
Ufa University of Science and Technology
Russian Federation
Russian Federation
Alexey Yu. Demin – Dr. Sci. (Eng.), Associate Prof., Head of the Department of Electronic Engineering
32 Zaki Validi Str., Ufa, Republic of Bashkortostan 450076
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Review
For citations:
Gunderov D.V., Stotskiy A.G., Gunderova S.D., Aubakirоva V.R., Demin A.Yu. Impact of ECAP at 300 °C on the microstructure and mechanical properties of the quenched Zr–2.5%Nb alloy. Izvestiya. Non-Ferrous Metallurgy. 2024;(1):81-92. https://doi.org/10.17073/0021-3438-2024-1-81-92
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