Mechanism of Hardening of Ultrafine-Grained Aluminum after Annealing
- Authors: Gutkin M.Y.1,2,3, Latynina T.A.2, Orlova T.S.2,4, Skiba N.V.1,3
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Affiliations:
- Institute of Problems of Mechanical Engineering, Russian Academy of Sciences
- ITMO University
- Peter the Great St. Petersburg Polytechnic University
- Ioffe Institute
- Issue: Vol 61, No 10 (2019)
- Pages: 1790-1799
- Section: Mechanical Properties, Physics of Strength, and Plasticity
- URL: https://journal-vniispk.ru/1063-7834/article/view/206270
- DOI: https://doi.org/10.1134/S1063783419100160
- ID: 206270
Cite item
Abstract
A theoretical model is proposed that describes the hardening mechanism of ultrafine-grained aluminum obtained by high pressure torsion after low-temperature annealing. Within this model, the hardening is due to the successive transformation of the grain-boundary dislocation structure. In particular, plastic deformation is occurs through the emission of lattice dislocations from triple junctions of grain boundaries containing pile-ups of grain-boundary dislocations, the subsequent sliding of lattice dislocations in the grain body, and the formation of walls of climbing grain-boundary dislocations along opposite grain boundaries. The energy characteristics and critical stresses for emission of lattice dislocations are calculated. Theoretical dependences of the flow stress on the plastic strain, which demonstrate good qualitative and quantitative agreement with experimental data, are constructed.
About the authors
M. Yu. Gutkin
Institute of Problems of Mechanical Engineering, Russian Academy of Sciences; ITMO University; Peter the Great St. Petersburg Polytechnic University
Author for correspondence.
Email: m.y.gutkin@gmail.com
Russian Federation, St. Petersburg, 199178; St. Petersburg, 197101; St. Petersburg, 195251
T. A. Latynina
ITMO University
Email: m.y.gutkin@gmail.com
Russian Federation, St. Petersburg, 197101
T. S. Orlova
ITMO University; Ioffe Institute
Email: m.y.gutkin@gmail.com
Russian Federation, St. Petersburg, 197101; St. Petersburg, 194021
N. V. Skiba
Institute of Problems of Mechanical Engineering, Russian Academy of Sciences; Peter the Great St. Petersburg Polytechnic University
Email: m.y.gutkin@gmail.com
Russian Federation, St. Petersburg, 199178; St. Petersburg, 195251
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