The Cyclic Stability of Superelasticity in Aged Ti<sub>49.3</sub>Ni<sub>50.7</sub> Single Crystals with Oxide Surface
The cyclic stability of superelasticity in compression in [001]<sub>B2</sub>-oriented Ti<sub>49.3</sub>Ni<sub>50.7</sub> single crystals is considered in this paper. The crystals were aged at 823 K for 1.0 h in air and helium. It has been experimentally shown that...
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2022-12-01
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| author | Anna S. Eftifeeva Elena Y. Panchenko Ilya D. Fatkullin Mikhail N. Volochaev Anton I. Tagiltsev Yuriy I. Chumlyakov |
| author_facet | Anna S. Eftifeeva Elena Y. Panchenko Ilya D. Fatkullin Mikhail N. Volochaev Anton I. Tagiltsev Yuriy I. Chumlyakov |
| author_sort | Anna S. Eftifeeva |
| collection | DOAJ |
| description | The cyclic stability of superelasticity in compression in [001]<sub>B2</sub>-oriented Ti<sub>49.3</sub>Ni<sub>50.7</sub> single crystals is considered in this paper. The crystals were aged at 823 K for 1.0 h in air and helium. It has been experimentally shown that a two-layered surface thin film, consisting of a Ni-free oxide layer and a Ni-rich sublayer, appears after the oxidation at 823 K in air. The surface layers have a weak effect on the forward B2-R-B19’ martensitic transformation temperatures: T<sub>R</sub> temperature increases by 4 K; M<sub>s</sub> and M<sub>f</sub> temperatures decrease by 6 K. The oxide layer does not affect either the superelasticity response during fatigue tests or the temperatures of reverse B19’-B2 martensitic transformation. The cracking of the surface oxide layer during fatigue tests was not found in [001]<sub>B2</sub>-oriented single crystals aged in air. This is contributed by the relaxation of internal stresses. Such internal stresses are caused by both the formation of an oxide layer during aging and the matrix deformation at the stress-induced martensitic transformation. The main relaxation mechanisms of the internal stresses are the oriented growth of Ti<sub>3</sub>Ni<sub>4</sub> precipitation near a thin surface film at aging in air, the formation of dislocations near the precipitation-matrix interface and a fine twinned B19’-martensite at fatigue tests. |
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| language | English |
| last_indexed | 2024-03-09T16:06:00Z |
| publishDate | 2022-12-01 |
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| spelling | doaj.art-45e5949cd76d4df49d77973930fbda252023-11-24T16:41:07ZengMDPI AGMetals2075-47012022-12-011212211310.3390/met12122113The Cyclic Stability of Superelasticity in Aged Ti<sub>49.3</sub>Ni<sub>50.7</sub> Single Crystals with Oxide SurfaceAnna S. Eftifeeva0Elena Y. Panchenko1Ilya D. Fatkullin2Mikhail N. Volochaev3Anton I. Tagiltsev4Yuriy I. Chumlyakov5Laboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenina Str. 36, 634050 Tomsk, RussiaLaboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenina Str. 36, 634050 Tomsk, RussiaLaboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenina Str. 36, 634050 Tomsk, RussiaKirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50/38, 660036 Krasnoyarsk, RussiaLaboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenina Str. 36, 634050 Tomsk, RussiaLaboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenina Str. 36, 634050 Tomsk, RussiaThe cyclic stability of superelasticity in compression in [001]<sub>B2</sub>-oriented Ti<sub>49.3</sub>Ni<sub>50.7</sub> single crystals is considered in this paper. The crystals were aged at 823 K for 1.0 h in air and helium. It has been experimentally shown that a two-layered surface thin film, consisting of a Ni-free oxide layer and a Ni-rich sublayer, appears after the oxidation at 823 K in air. The surface layers have a weak effect on the forward B2-R-B19’ martensitic transformation temperatures: T<sub>R</sub> temperature increases by 4 K; M<sub>s</sub> and M<sub>f</sub> temperatures decrease by 6 K. The oxide layer does not affect either the superelasticity response during fatigue tests or the temperatures of reverse B19’-B2 martensitic transformation. The cracking of the surface oxide layer during fatigue tests was not found in [001]<sub>B2</sub>-oriented single crystals aged in air. This is contributed by the relaxation of internal stresses. Such internal stresses are caused by both the formation of an oxide layer during aging and the matrix deformation at the stress-induced martensitic transformation. The main relaxation mechanisms of the internal stresses are the oriented growth of Ti<sub>3</sub>Ni<sub>4</sub> precipitation near a thin surface film at aging in air, the formation of dislocations near the precipitation-matrix interface and a fine twinned B19’-martensite at fatigue tests.https://www.mdpi.com/2075-4701/12/12/2113martensitic transformationsingle crystalsagingprecipitationoxide layerfunctional properties |
| spellingShingle | Anna S. Eftifeeva Elena Y. Panchenko Ilya D. Fatkullin Mikhail N. Volochaev Anton I. Tagiltsev Yuriy I. Chumlyakov The Cyclic Stability of Superelasticity in Aged Ti<sub>49.3</sub>Ni<sub>50.7</sub> Single Crystals with Oxide Surface Metals martensitic transformation single crystals aging precipitation oxide layer functional properties |
| title | The Cyclic Stability of Superelasticity in Aged Ti<sub>49.3</sub>Ni<sub>50.7</sub> Single Crystals with Oxide Surface |
| title_full | The Cyclic Stability of Superelasticity in Aged Ti<sub>49.3</sub>Ni<sub>50.7</sub> Single Crystals with Oxide Surface |
| title_fullStr | The Cyclic Stability of Superelasticity in Aged Ti<sub>49.3</sub>Ni<sub>50.7</sub> Single Crystals with Oxide Surface |
| title_full_unstemmed | The Cyclic Stability of Superelasticity in Aged Ti<sub>49.3</sub>Ni<sub>50.7</sub> Single Crystals with Oxide Surface |
| title_short | The Cyclic Stability of Superelasticity in Aged Ti<sub>49.3</sub>Ni<sub>50.7</sub> Single Crystals with Oxide Surface |
| title_sort | cyclic stability of superelasticity in aged ti sub 49 3 sub ni sub 50 7 sub single crystals with oxide surface |
| topic | martensitic transformation single crystals aging precipitation oxide layer functional properties |
| url | https://www.mdpi.com/2075-4701/12/12/2113 |
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