Phase composition, structure and microhardness of the VT23 titanium alloy after deformation in a Bridgman chamber
The authors have studied for the first time the phase composition, microhardness and fine structure of the VT23 (α+β)-titanium alloy, with stable and metastable β-phase, after torsional deformation in a Bridgman chamber under a pressure of 4 GPa at room temperature. It has been found that the alloy...
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Togliatti State University
2024-12-01
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| Series: | Frontier Materials & Technologies |
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| Online Access: | https://vektornaukitech.ru/jour/article/view/990/914 |
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| author | Sergey V. Gladkovsky Vitaly P. Pilyugin Valeria E. Veselova Aleksandr M. Patselov |
| author_facet | Sergey V. Gladkovsky Vitaly P. Pilyugin Valeria E. Veselova Aleksandr M. Patselov |
| author_sort | Sergey V. Gladkovsky |
| collection | DOAJ |
| description | The authors have studied for the first time the phase composition, microhardness and fine structure of the VT23 (α+β)-titanium alloy, with stable and metastable β-phase, after torsional deformation in a Bridgman chamber under a pressure of 4 GPa at room temperature. It has been found that the alloy microhardness, depending on the true degree of deformation under high hydrostatic pressure, changes along a curve with a maximum. The role of stress-induced βm→α" martensitic transformation in the formation of alloy structure, and microhardness under high-pressure torsion was revealed. The highest microhardness of the alloy with stable β-phase was 395 HV 0.05, and with metastable – 470 HV 0.05. At the same time, the maximum microhardness of metastable alloy, compared to stable alloy, was shifted to the region of lower true strain е=2.6. Using X-ray diffraction analysis, and transmission electron microscopy methods, made it possible to trace the evolution of alloy structure under high-pressure deformation consisting in grinding of α-, and α"-phase plates compared to the quenched state, as well as in the development of deformation βm→α", and α"→βm martensitic transformations. An increase in the degree of deformation by high-pressure torsion to е=7.7...7.9, regardless of the deformation stability of the β-phase, leads to a decrease in the alloy microhardness to a level of 185...205 HV 0.05. This is associated with the development of the dynamic recrystallisation process, and the formation of equiaxed α-phase nanoparticles with a size of 20...50 nm. The differences in the loading-unloading curves revealed by kinetic indentation, corresponded to the nature of the change in the VT23 alloy microhardness, depending on the quenching temperature and the true deformation degree. |
| format | Article |
| id | doaj-art-35b88a034caa4c44856354998a10aef8 |
| institution | DOAJ |
| issn | 2782-4039 2782-6074 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Togliatti State University |
| record_format | Article |
| series | Frontier Materials & Technologies |
| spelling | doaj-art-35b88a034caa4c44856354998a10aef82025-08-20T02:42:24ZengTogliatti State UniversityFrontier Materials & Technologies2782-40392782-60742024-12-01-4293810.18323/2782-4039-2024-4-70-3Phase composition, structure and microhardness of the VT23 titanium alloy after deformation in a Bridgman chamberSergey V. Gladkovsky0https://orcid.org/0000-0002-3542-6242Vitaly P. Pilyugin1https://orcid.org/0000-0002-5150-6605Valeria E. Veselova2https://orcid.org/0000-0002-4955-6435Aleksandr M. Patselov3https://orcid.org/0000-0001-6438-0725Institute of Engineering Science of the Ural Branch of RAS, Yekaterinburg (Russia)M.N. Mikheev Institute of Metal Physics of the Ural Branch of RAS, Yekaterinburg (Russia)Institute of Engineering Science of the Ural Branch of RAS, Yekaterinburg (Russia)M.N. Mikheev Institute of Metal Physics of the Ural Branch of RAS, Yekaterinburg (Russia)The authors have studied for the first time the phase composition, microhardness and fine structure of the VT23 (α+β)-titanium alloy, with stable and metastable β-phase, after torsional deformation in a Bridgman chamber under a pressure of 4 GPa at room temperature. It has been found that the alloy microhardness, depending on the true degree of deformation under high hydrostatic pressure, changes along a curve with a maximum. The role of stress-induced βm→α" martensitic transformation in the formation of alloy structure, and microhardness under high-pressure torsion was revealed. The highest microhardness of the alloy with stable β-phase was 395 HV 0.05, and with metastable – 470 HV 0.05. At the same time, the maximum microhardness of metastable alloy, compared to stable alloy, was shifted to the region of lower true strain е=2.6. Using X-ray diffraction analysis, and transmission electron microscopy methods, made it possible to trace the evolution of alloy structure under high-pressure deformation consisting in grinding of α-, and α"-phase plates compared to the quenched state, as well as in the development of deformation βm→α", and α"→βm martensitic transformations. An increase in the degree of deformation by high-pressure torsion to е=7.7...7.9, regardless of the deformation stability of the β-phase, leads to a decrease in the alloy microhardness to a level of 185...205 HV 0.05. This is associated with the development of the dynamic recrystallisation process, and the formation of equiaxed α-phase nanoparticles with a size of 20...50 nm. The differences in the loading-unloading curves revealed by kinetic indentation, corresponded to the nature of the change in the VT23 alloy microhardness, depending on the quenching temperature and the true deformation degree.https://vektornaukitech.ru/jour/article/view/990/914vt23 titanium alloyphase compositionbridgman chamberhigh-pressure torsiontrue deformation degreemetastable β-phasemartensitic transformations |
| spellingShingle | Sergey V. Gladkovsky Vitaly P. Pilyugin Valeria E. Veselova Aleksandr M. Patselov Phase composition, structure and microhardness of the VT23 titanium alloy after deformation in a Bridgman chamber Frontier Materials & Technologies vt23 titanium alloy phase composition bridgman chamber high-pressure torsion true deformation degree metastable β-phase martensitic transformations |
| title | Phase composition, structure and microhardness of the VT23 titanium alloy after deformation in a Bridgman chamber |
| title_full | Phase composition, structure and microhardness of the VT23 titanium alloy after deformation in a Bridgman chamber |
| title_fullStr | Phase composition, structure and microhardness of the VT23 titanium alloy after deformation in a Bridgman chamber |
| title_full_unstemmed | Phase composition, structure and microhardness of the VT23 titanium alloy after deformation in a Bridgman chamber |
| title_short | Phase composition, structure and microhardness of the VT23 titanium alloy after deformation in a Bridgman chamber |
| title_sort | phase composition structure and microhardness of the vt23 titanium alloy after deformation in a bridgman chamber |
| topic | vt23 titanium alloy phase composition bridgman chamber high-pressure torsion true deformation degree metastable β-phase martensitic transformations |
| url | https://vektornaukitech.ru/jour/article/view/990/914 |
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