Omega Phase Formation in Ti–3wt.%Nb Alloy Induced by High-Pressure Torsion
It is well known that severe plastic deformation not only leads to strong grain refinement and material strengthening but also can drive phase transformations. A study of the fundamentals of α → ω phase transformations induced by high-pressure torsion (HPT) in Ti–Nb-based alloys is presented in the...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-04-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/14/9/2262 |
| _version_ | 1797536145381261312 |
|---|---|
| author | Anna Korneva Boris Straumal Askar Kilmametov Alena Gornakova Anna Wierzbicka-Miernik Lidia Lityńska-Dobrzyńska Robert Chulist Łukasz Gondek Grzegorz Cios Paweł Zięba |
| author_facet | Anna Korneva Boris Straumal Askar Kilmametov Alena Gornakova Anna Wierzbicka-Miernik Lidia Lityńska-Dobrzyńska Robert Chulist Łukasz Gondek Grzegorz Cios Paweł Zięba |
| author_sort | Anna Korneva |
| collection | DOAJ |
| description | It is well known that severe plastic deformation not only leads to strong grain refinement and material strengthening but also can drive phase transformations. A study of the fundamentals of α → ω phase transformations induced by high-pressure torsion (HPT) in Ti–Nb-based alloys is presented in the current work. Before HPT, a Ti–3wt.%Nb alloy was annealed at two different temperatures in order to obtain the α-phase state with different amounts of niobium. X-ray diffraction analysis, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were applied for the characterisation of phase transitions and evolution of the microstructure. A small amount of the β-phase was found in the initial states, which completely transformed into the ω-phase during the HPT process. During HPT, strong grain refinement in the α-phase took place, as did partial transformation of the α- into the ω-phase. Therefore, two kinds of ω-phase, each with different chemical composition, were obtained after HPT. The first one was formed from the β-phase, enriched in Nb, and the second one from the α-phase. It was also found that the transformation of the α-phase into the ω-phase depended on the Nb concentration in the α-Ti phase. The less Nb there was in the α-phase, the more of the α-phase was transformed into the ω-phase. |
| first_indexed | 2024-03-10T11:55:30Z |
| format | Article |
| id | doaj.art-e66cecc47d964334950cb87f60b60b78 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T11:55:30Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-e66cecc47d964334950cb87f60b60b782023-11-21T17:25:07ZengMDPI AGMaterials1996-19442021-04-01149226210.3390/ma14092262Omega Phase Formation in Ti–3wt.%Nb Alloy Induced by High-Pressure TorsionAnna Korneva0Boris Straumal1Askar Kilmametov2Alena Gornakova3Anna Wierzbicka-Miernik4Lidia Lityńska-Dobrzyńska5Robert Chulist6Łukasz Gondek7Grzegorz Cios8Paweł Zięba9Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Krakow, PolandKarlsruhe Institute of Technology (KIT), Institute of Nanotechnology, 76344 Eggenstein-Leopoldshafen, GermanyScientific Center in Chernogolovka, Russian Academy of Sciences, 142432 Chernogolovka, RussiaInstitute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, RussiaInstitute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Krakow, PolandInstitute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Krakow, PolandInstitute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Krakow, PolandFaculty of Physics and Applied Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, PolandAcademic Centre of Materials and Nanotechnology, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, PolandInstitute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Krakow, PolandIt is well known that severe plastic deformation not only leads to strong grain refinement and material strengthening but also can drive phase transformations. A study of the fundamentals of α → ω phase transformations induced by high-pressure torsion (HPT) in Ti–Nb-based alloys is presented in the current work. Before HPT, a Ti–3wt.%Nb alloy was annealed at two different temperatures in order to obtain the α-phase state with different amounts of niobium. X-ray diffraction analysis, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were applied for the characterisation of phase transitions and evolution of the microstructure. A small amount of the β-phase was found in the initial states, which completely transformed into the ω-phase during the HPT process. During HPT, strong grain refinement in the α-phase took place, as did partial transformation of the α- into the ω-phase. Therefore, two kinds of ω-phase, each with different chemical composition, were obtained after HPT. The first one was formed from the β-phase, enriched in Nb, and the second one from the α-phase. It was also found that the transformation of the α-phase into the ω-phase depended on the Nb concentration in the α-Ti phase. The less Nb there was in the α-phase, the more of the α-phase was transformed into the ω-phase.https://www.mdpi.com/1996-1944/14/9/2262high-pressure torsionin situ high-temperature X-ray diffractionTi alloysphase transformationsscanning electron microscopytransmission electron microscopy |
| spellingShingle | Anna Korneva Boris Straumal Askar Kilmametov Alena Gornakova Anna Wierzbicka-Miernik Lidia Lityńska-Dobrzyńska Robert Chulist Łukasz Gondek Grzegorz Cios Paweł Zięba Omega Phase Formation in Ti–3wt.%Nb Alloy Induced by High-Pressure Torsion Materials high-pressure torsion in situ high-temperature X-ray diffraction Ti alloys phase transformations scanning electron microscopy transmission electron microscopy |
| title | Omega Phase Formation in Ti–3wt.%Nb Alloy Induced by High-Pressure Torsion |
| title_full | Omega Phase Formation in Ti–3wt.%Nb Alloy Induced by High-Pressure Torsion |
| title_fullStr | Omega Phase Formation in Ti–3wt.%Nb Alloy Induced by High-Pressure Torsion |
| title_full_unstemmed | Omega Phase Formation in Ti–3wt.%Nb Alloy Induced by High-Pressure Torsion |
| title_short | Omega Phase Formation in Ti–3wt.%Nb Alloy Induced by High-Pressure Torsion |
| title_sort | omega phase formation in ti 3wt nb alloy induced by high pressure torsion |
| topic | high-pressure torsion in situ high-temperature X-ray diffraction Ti alloys phase transformations scanning electron microscopy transmission electron microscopy |
| url | https://www.mdpi.com/1996-1944/14/9/2262 |
| work_keys_str_mv | AT annakorneva omegaphaseformationinti3wtnballoyinducedbyhighpressuretorsion AT borisstraumal omegaphaseformationinti3wtnballoyinducedbyhighpressuretorsion AT askarkilmametov omegaphaseformationinti3wtnballoyinducedbyhighpressuretorsion AT alenagornakova omegaphaseformationinti3wtnballoyinducedbyhighpressuretorsion AT annawierzbickamiernik omegaphaseformationinti3wtnballoyinducedbyhighpressuretorsion AT lidialitynskadobrzynska omegaphaseformationinti3wtnballoyinducedbyhighpressuretorsion AT robertchulist omegaphaseformationinti3wtnballoyinducedbyhighpressuretorsion AT łukaszgondek omegaphaseformationinti3wtnballoyinducedbyhighpressuretorsion AT grzegorzcios omegaphaseformationinti3wtnballoyinducedbyhighpressuretorsion AT pawełzieba omegaphaseformationinti3wtnballoyinducedbyhighpressuretorsion |