Transformations of the Microstructure and Phase Compositions of Titanium Alloys during Ultrasonic Impact Treatment. Part I. Commercially Pure Titanium
| Autor: | Marina Kazachenok, Olga Perevalova, Anton Yu. Nikonov, Elena Sklyarova, Alexey Panin, Andrey I. Dmitriev |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
lcsh:TN1-997
электронная структура Materials science phase transformation microstructure Ultrasonic impact treatment chemistry.chemical_element ultrasonic impact treatment 02 engineering and technology 01 natural sciences Phase (matter) 0103 physical sciences transmission electron microscopy титан General Materials Science Surface layer titanium Composite material молекулярная динамика lcsh:Mining engineering. Metallurgy 010302 applied physics микроструктура фазовое превращение Metals and Alloys Titanium alloy 021001 nanoscience & nanotechnology Microstructure electronic structure molecular dynamics chemistry Dislocation 0210 nano-technology Crystal twinning Titanium |
| Zdroj: | Metals Volume 11 Issue 4 Metals, Vol 11, Iss 562, p 562 (2021) |
| ISSN: | 2075-4701 |
| DOI: | 10.3390/met11040562 |
| Popis: | Experimental and theoretical studies helped to reveal patterns of surface roughening and the microstructure refinement in the surface layer of commercial pure titanium during ultrasonic impact treatment. Applying transmission electron microscopy technique, a gradient microstructure in the surface layer of the ultrasonically treated sample, where the grain size is varied from nano- to micrometers was revealed. It was shown that the surface plastic strains of the titanium sample proceeded according to the plastic ploughing mechanism, which was accompanied by dislocation sliding, twinning, and the transformations of the microstructure and phase composition. The molecular dynamics method was applied to demonstrate the mechanism of the phase transformations associated with the formation of stacking faults, as well as the reversible displacement of atoms from their sites in the hcp lattice, causing a change in coordination numbers. The role of the electronic subsystem in the development of the strain-induced phase transformations during ultrasonic impact treatment was discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|