Structural-and-Phase Transformations in Fe-4.10 and 7.25 at.% Mn Alloys under Intensity External Actions
The effect of high-pressure torsion (HPT) (<i>P</i> = 8 GPa, <i>e</i> = 5.9) and irradiation with continuous beams of Ar<sup>+</sup> ions with energy <i>E</i> = 15 keV on the atomic structure and phase composition of initially quenched iron alloys with...
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MDPI AG
2021-10-01
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| Online Access: | https://www.mdpi.com/2075-4701/11/11/1667 |
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| author | Vladimir V. Ovchinnikov Efrem V. Makarov Natalia V. Gushchina |
| author_facet | Vladimir V. Ovchinnikov Efrem V. Makarov Natalia V. Gushchina |
| author_sort | Vladimir V. Ovchinnikov |
| collection | DOAJ |
| description | The effect of high-pressure torsion (HPT) (<i>P</i> = 8 GPa, <i>e</i> = 5.9) and irradiation with continuous beams of Ar<sup>+</sup> ions with energy <i>E</i> = 15 keV on the atomic structure and phase composition of initially quenched iron alloys with 4.10 and 7.25 at.% Mn was studied by the method of Mössbauer spectroscopy. The supersaturated α-solid solution of Fe-7.25 at.% Mn, in contrast to the stable Fe-4.10 at.% Mn, which passes into a highly nonequilibrium metastable state as a result of HPT deformation, is transformed under the influence of ion irradiation at an abnormally low temperature of 280 °C into a two-phase α + γ-state with a highly enriched γ-phase (austenite) (38.4 at.% Mn) and a depleted α-solid solution with 5.76 at.% Mn. The rapid processes with the formation of the γ-phase with a concentration of Mn close to the extrapolation estimate using the equilibrium phase diagram are explained by the cascade radiation shaking of the material by post-cascade powerful elastic and shock waves. Cascade radiation shaking plays the role of temperature and opens up the possibility of achieving states close to equilibrium in the absence of thermally activated processes at record low temperatures. |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T05:16:31Z |
| publishDate | 2021-10-01 |
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| spelling | doaj.art-3195deb0f66749dda6283c8296d9e9f52023-11-23T00:21:45ZengMDPI AGMetals2075-47012021-10-011111166710.3390/met11111667Structural-and-Phase Transformations in Fe-4.10 and 7.25 at.% Mn Alloys under Intensity External ActionsVladimir V. Ovchinnikov0Efrem V. Makarov1Natalia V. Gushchina2Laboratory of Ion Beam Exposures, Institute of Electrophysics, Ural Branch of the Russian Academy of Sciences, St. Amundsen, 106, 620016 Yekaterinburg, RussiaLaboratory of Ion Beam Exposures, Institute of Electrophysics, Ural Branch of the Russian Academy of Sciences, St. Amundsen, 106, 620016 Yekaterinburg, RussiaLaboratory of Ion Beam Exposures, Institute of Electrophysics, Ural Branch of the Russian Academy of Sciences, St. Amundsen, 106, 620016 Yekaterinburg, RussiaThe effect of high-pressure torsion (HPT) (<i>P</i> = 8 GPa, <i>e</i> = 5.9) and irradiation with continuous beams of Ar<sup>+</sup> ions with energy <i>E</i> = 15 keV on the atomic structure and phase composition of initially quenched iron alloys with 4.10 and 7.25 at.% Mn was studied by the method of Mössbauer spectroscopy. The supersaturated α-solid solution of Fe-7.25 at.% Mn, in contrast to the stable Fe-4.10 at.% Mn, which passes into a highly nonequilibrium metastable state as a result of HPT deformation, is transformed under the influence of ion irradiation at an abnormally low temperature of 280 °C into a two-phase α + γ-state with a highly enriched γ-phase (austenite) (38.4 at.% Mn) and a depleted α-solid solution with 5.76 at.% Mn. The rapid processes with the formation of the γ-phase with a concentration of Mn close to the extrapolation estimate using the equilibrium phase diagram are explained by the cascade radiation shaking of the material by post-cascade powerful elastic and shock waves. Cascade radiation shaking plays the role of temperature and opens up the possibility of achieving states close to equilibrium in the absence of thermally activated processes at record low temperatures.https://www.mdpi.com/2075-4701/11/11/1667Fe-Mn alloyion irradiationaustenite formationsevere plastic deformationhigh-pressure torsionlong-range effects |
| spellingShingle | Vladimir V. Ovchinnikov Efrem V. Makarov Natalia V. Gushchina Structural-and-Phase Transformations in Fe-4.10 and 7.25 at.% Mn Alloys under Intensity External Actions Metals Fe-Mn alloy ion irradiation austenite formation severe plastic deformation high-pressure torsion long-range effects |
| title | Structural-and-Phase Transformations in Fe-4.10 and 7.25 at.% Mn Alloys under Intensity External Actions |
| title_full | Structural-and-Phase Transformations in Fe-4.10 and 7.25 at.% Mn Alloys under Intensity External Actions |
| title_fullStr | Structural-and-Phase Transformations in Fe-4.10 and 7.25 at.% Mn Alloys under Intensity External Actions |
| title_full_unstemmed | Structural-and-Phase Transformations in Fe-4.10 and 7.25 at.% Mn Alloys under Intensity External Actions |
| title_short | Structural-and-Phase Transformations in Fe-4.10 and 7.25 at.% Mn Alloys under Intensity External Actions |
| title_sort | structural and phase transformations in fe 4 10 and 7 25 at mn alloys under intensity external actions |
| topic | Fe-Mn alloy ion irradiation austenite formation severe plastic deformation high-pressure torsion long-range effects |
| url | https://www.mdpi.com/2075-4701/11/11/1667 |
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