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Orientation dependence of superelasticity in quenched high-nickel Ti-51.8Ni single crystals / E. E. Timofeeva, E. Y. Panchenko, A. I. Tagiltsev [et al.] // Mater. Lett. - 2021. - Vol. 282. - Ст. 128677, DOI 10.1016/j.matlet.2020.128677. - Cited References: 12. - This work was supported by the Russian Science Foundation (grant No. 18–19–00298 ). The electron microscopy studies were carried out on the equipment of the Krasnoyarsk Regional Center for Collective Use SB RAS . - ISSN 0167-577X
Кл.слова (ненормированные):
Phase transformation -- Shape memory materials -- Ti-Ni -- Single crystals -- Superelasticity -- Strain-glass
Аннотация: The orientation dependence of the functional and mechanical properties of quenched Ti-51.8at.%Ni single crystals, undergoing a strain-glass transition upon cooling/heating was investigated. It was found that a compressive stress above 800 MPa leads to the B2-B19′ martensitic transformation (MT), regardless of orientation. In the high-strength [0 0 1]-orientation, superelasticity (SE) was observed at 203–248 K, with a reversible strain of 2.3%. Degradation of SE at deforming stresses σ > 1000 MPa was associated with the formation of {1 1 3}B2 twins during the reverse MT. In the low-strength [1 1 1]-orientation, the formation of stress-induced B19′-martensite occurred simultaneously with the plastic deformation of the B2-phase (due to the formation of reorientation bands and dislocation slip) and a reversible strain was not observed.

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Держатели документа:
Tomsk State University, Novosobornaya Square 1, Tomsk, 634050, Russian Federation
Kirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Timofeeva, E. E.; Panchenko, E. Y.; Tagiltsev, A. I.; Larchenkova, N. G.; Tokhmetova, A. B.; Chumlyakov, Y. I.; Volochaev, M. N.; Волочаев, Михаил Николаевич
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The cyclic stability of superelasticity in aged Ti49.3Ni50.7 single crystals with oxide surface / A. S. Eftifeeva, E. Y. Panchenko, I. D. Fatkullin [et al.] // Metals. - 2022. - Vol. 12, Is. 12. - Ст. 2113, DOI 10.3390/met12122113. - Cited References: 30. - This research was funded by grant under the Decree of the Government of the Russian Federation No. 220 of 9 April 2010 (Agreement No. 075-15-2021-612 of 4 June 2021) . - ISSN 2075-4701
Кл.слова (ненормированные):
martensitic transformation -- single crystals -- aging -- precipitation -- oxide layer -- functional properties
Аннотация: The cyclic stability of superelasticity in compression in [001]B2-oriented Ti49.3Ni50.7 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: TR temperature increases by 4 K; Ms and Mf 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]B2-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 Ti3Ni4 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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Держатели документа:
Laboratory for Physics of High-Strength Crystals, Siberian Physical-Technical Institute, Tomsk State University, Lenina Str. 36, 634050 Tomsk, Russia
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50/38, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Eftifeeva, Anna S.; Panchenko, Elena Y.; Fatkullin, Ilya D.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Tagiltsev, Anton I.; Chumlyakov, Yuriy I.
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