Abstract:
A theoretical model that describes the implementation of high ductility in high-pressure torsion (HPT) processed ultrafine-grained aluminum subjected to annealing and additional HPT deformation, is suggested. In the framework of the model, the plastic deformation is realized through the successive emission of lattice dislocations from triple junctions of grain boundaries due to splitting of head dislocations in pile-ups of grain boundary dislocations, which are pressed by an external shear stress against these triple junctions, and their subsequent glide in grain interior and climb along surrounding grain boundaries. The energy characteristics and the critical stresses of dislocation emission have been determined for ultrafine-grained aluminum subjected to annealing with small additional HPT deformation. The theoretical stress–strain curves demonstrate good agreement with experimental data available in the literature.
Keywords:
lattice dislocations, grain boundaries, ductility, annealing, high pressure torsion.
The present work was partly financially supported by the Russian Foundation for Basic Research (grant no. 19-08-00474) and (for N.V. Skiba) Ministry of Science and Higher Education of the Russian Federation (task no. 0784-2020-0027).
Citation:
N. V. Skiba, T. S. Orlova, M. Yu. Gutkin, “Mechanism of implementation of high ductility in ultrafine-grained aluminum after annealing and subsequent deformation”, Fizika Tverdogo Tela, 62:11 (2020), 1865; Phys. Solid State, 62:11 (2020), 2094–2100
\Bibitem{SkiOrlGut20}
\by N.~V.~Skiba, T.~S.~Orlova, M.~Yu.~Gutkin
\paper Mechanism of implementation of high ductility in ultrafine-grained aluminum after annealing and subsequent deformation
\jour Fizika Tverdogo Tela
\yr 2020
\vol 62
\issue 11
\pages 1865
\mathnet{http://mi.mathnet.ru/ftt10171}
\transl
\jour Phys. Solid State
\yr 2020
\vol 62
\issue 11
\pages 2094--2100
\crossref{https://doi.org/10.1134/S1063783420110347}
Linking options:
https://www.mathnet.ru/eng/ftt10171
https://www.mathnet.ru/eng/ftt/v62/i11/p1865
This publication is cited in the following 4 articles:
T.S. Orlova, M.Yu. Gutkin, “Effects of Hardening by Annealing and Softening by Additional Plastic Deformation in Ultrafine-Grained Al and Al-Based Alloys: Brief Review”, Rev. Adv. Mater. Technol., 5:2 (2023), 32
T.S. Orlova, D.I. Sadykov, D.V. Danilov, M.Yu. Murashkin, “Influence of decreased temperature on the plasticization effect in high-strength Al-Cu-Zr alloy”, Journal of Alloys and Compounds, 931 (2023), 167540
Sergey V. Bobylev, Mikhail Yu. Gutkin, Alexander G. Sheinerman, Nikolay V. Skiba, Advanced Structured Materials, 164, Mechanics and Control of Solids and Structures, 2022, 91
D.I. Sadykov, A.M. Mavlyutov, T.S. Orlova, “Enhanced Ductility of High-Strength Ultrafine-Grained Aluminum Alloys at Ambient Temperature (Review)”, Rev. Adv. Mater. Technol., 4:2 (2022), 1