Mechanism of Hardening of Ultrafine-Grained Aluminum after Annealing
| Autor: | N. V. Skiba, M. Yu. Gutkin, T. S. Orlova, T. A. Latynina |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Annealing (metallurgy) Torsion (mechanics) Plasticity Flow stress Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Lattice (order) 0103 physical sciences Hardening (metallurgy) Grain boundary Composite material Dislocation 010306 general physics |
| Zdroj: | Physics of the Solid State. 61:1790-1799 |
| ISSN: | 1090-6460 1063-7834 |
| DOI: | 10.1134/s1063783419100160 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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