Physics of the Solid State
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- 2023
- 2022
Micromechanism of plastic deformation enhancement in ultrafine-grained Al-Cu-Zr alloy after annealing and additional deformation
Gutkin M.Yu.
1,2,3, Orlova T.S.
4, Skiba N.V.
4
1Institute for Problems in Mechanical Engineering of the Russian Academy of Sciences, St. Petersburg, Russia
2 ITMO University, St. Petersburg, Russia
3Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
4Ioffe Institute, St. Petersburg, Russia
2 ITMO University, St. Petersburg, Russia
3Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
4Ioffe Institute, St. Petersburg, Russia
Email: m.y.gutkin@gmail.com, orlova.t@mail.ioffe.ru, nikolay.skiba@gmail.com
A theoretical model which describes a micromechanism of plasticity enhancement in an ultrafine-grained Al-Cu-Zr alloy after annealing and additional deformation is suggested. Within the framework of the model, it was shown that nanoprecipitates of the secondary phase Al2Cu in the grain boundaries become the effective sources of the lattice dislocations in the presence of a large number of the grain boundary dislocations near the nanoprecipitates. The theoretical dependences of the flow stress on the degree of the plastic deformation demonstrate good qualitative and quantitative agreement with the experimental data. The emission of the lattice dislocations from nanoprecipitates provides higher plasticity compared to the emission of the lattice dislocations from the triple junctions of the grain boundaries. Keywords: ultrafine-grained materials, aluminum alloys, nanoprecipitates, annealing, severe plastic deformation by high-pressure torsion, dislocations, grain boundaries.
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