Научная электронная библиотека ULRICH'S Periodicals Directory

Сибирский государственный университет
науки и технологий имени академика М.Ф. Решетнева

Сибирский аэрокосмический журнал
ISSN 2712-8970 (Print) ISSN 2782-5760 (on-line)

Сведения об образовательной организации

UDK 669.24
MAGNETIC PROPERTIES OF PLASTICALLY DEFORMED NICKEL-TITANIUM ALLOY
F. M. Noskov1, A. V. Nyavro2, V. N. Cherepanov2, A. K. Drozdova2, L. I. Kveglis1
1Siberian Federal University 79/10, Svobodnyy Av., Krasnoyarsk, 660041, Russian Federation 2National Research Tomsk State University 36, Lenina Av., Tomsk, 634050, Russian Federation
Ni–Ti alloy has been intensively studied over the past decades. The unique properties of the alloy have allowed using it as a structural material for the creation of instruments and devices in various fields of science and technology, including mechanical engineering, aerospace, instrumentation. Measuring magnetic hysteresis loop is shown that after the deformation of the alloy having ferromagnetic properties. According to the equilibrium phase diagram, the alloys of Ni–Ti at a Ti content above 10 at. % is non-ferromagnetic. Due to lowering of the crystal phase symmetry with a cubic lattice the magnetization appears. In this work we have investigated the magnetic properties and the structure of deformed Ni51Ti49 samples by electron microscopy and X-ray diffraction methods. In Ni51Ti49 samples after plastic deformation the lenticular crystals containing bending contours with a high concentration of internal stresses were found. Bending contours indicate a large distortion of the crystal lattice. The curvature of the crystal lattice occurs due to the large displacements of the atoms. As a result, it can be formed and icosahedral cluster with the structure of the Frank– Kasper. An icosahedron is a twelve vertex polyhedron, which is denoted by FK-12. Furthermore, the crystal can be formed in other Frank–Kasper structures, e. g., FK-16. FK-16 is a sixteen vertex polyhedron with atom located in the center of the cluster. Indexing paintings electron diffraction and X-ray showed that the alloy phase of the Ni–Ti coexist with the structure Ti2Ni and Ni4Ti3. For explaining the possibility of the appearance of magnetization in Ni–Ti alloy samples spin-polarized electron density of states and magnetic moments Ni10Ti6 clusters (FK-16), Ni7Ti5 (FK-12) alloy Ni51Ti49 for electrons with different spin projections: “up” and “down” was calculated. The calculation by the scattered waves (RF) was performed. The results of calculation can be seen that the total electron density of nickel tends to zero faster than the density of titanium. Also shows that nickel becomes negative spin density in the area of r = 3.25–6.7 a. u. and titanium for r > 4.5 a. u. This may result depending on the value of the interatomic distances and to the effects ferromagnetism and antiferromagnetic in order to establish a magnetic clusters. The spectra show a high density of states near the Fermi level that is a characteristic feature of metals, besides there is an increase in the magnetization of the alloy during deformation. The calculations showed that the investigated clusters, not susceptible to deformation, also have a magnetic moment (the average magnetic moment per atom cluster FK-12, is about 1,0 μB, and for the FK-16 is about 0.3 μB. Overall, however, the average magnetic moment is zero, due to the absence of a preferred direction (the chaotic distribution of clusters) for the alloy. However, if the cluster is subjected to tension, the compensation of the magnetic moments of clusters occurs in the alloy, since there is allocated for all atoms direction due to deformation. At the same time, the average magnetic moments of the atoms in the cluster for the Deformed increase to 1.6 μB and 0.8 μB respectively for the FK-12 and FK-16.
Keywords: titanium nickel alloy, ferromagnetic properties, lenticular crystal cluster, the icosahedron, pentagonal symmetry, spin-polarized electron density of states.
References

1. Gunter V. E., Yasenchuk Y. F., Klopotov A. A., Khodorenko V. N. [Physical and mechanical properties and structure of the porous alloy superelastic TiNi]. Рis’ma v ZhTF. 2000, Vol. 26, No. 1, P. 71–76 (In Russ.).

2. Gunter V. E., Dombaev G. T., Sysolyatin P. G. et al. Meditsinskie materialy i implantaty s pamyat’yu formy [Medical Materials and Implants with Shape Memory]. Tomsk, TGU Publ., 1998, 486 p.

3. Itin V. I., Shevchenko N. A., Korostelyova E. N., Tuhfatullin A. A., Mirgazizov M. Z., Gunter V. E. [Functional composites “bioceramics titanium-nickel alloy” for medicine]. Рis’ma v ZhTF. 1997, Vol. 23, No 8, P. 1–6 (In Russ.).

4. Kveglis L. I., Noskov F. M., Volochaev M. N., Jess A. V. [Martensitic transformations in NiTi through an intermediate phase with FCC]. Fizicheskaja mezomehanika. 2016, Vol. 19, No. 2, Р. 100–107 (In Russ.).

5. Abylkalykova R. B., Tazhibaeva G. B., Noskov F. M., Kveglis L. I. Features of martensitic transformation in NiTi. Bulletin of the Russian Academy of Sciences: Physics. 2009, Vol. 73, No. 11, Р. 1542–1544.

6. Panin V. E., Egorushkin V. E. [Curvature Solitons as Generalized Structural Wave Carriers of Plastic Deformation and Fracture]. Fizicheskaya mezomekhanika. 2013, Vol. 16, No. 4, P. 267–286 (In Russ.).

7. Takacs L. Mechanochemistry and the Other Branches of Chemistry: Similarities and Dierences. Acta physica polonica А. 2012, Vol. 121, No. 3, Р. 711–714.

8. Khomskii D. I., Kugel K. I., Sboychakov A. O., Streltsov S. V. Role of local geometry in the spin and orbital structure of transition metal compounds. JETP letters. 2016, Vol. 122, No 3, Р. 484.

9. Gudenough J. B. Magnetism and the Chemical Bond. New York, Wiley Intersci. 1963, 394 р.

10. Frolov G. I., Zhigalov V. S. Fizicheskie svoystva i primenenie magnitoplenochnykh nanokompozitov [Physical properties and application of nanocomposite magnetic films]. Novosibirsk, SB RAS Publ., 2006, 187 р.

11. Kolosov V. Yu., Tholen A. R. Transmission electron microscopy studies of the specific structure of crystals formed by phase transition in iron oxide amorphous films. Acta Materialia. 2000, Vol. 48, P. 1829.

12. Talis A., Kraposhin V. Finite noncrystallographic groups, 11-vertex equi-edged triangulated clusters and polymorphic transformations in metals. ActaCryst. 2014, Vol. A70, Р. 616–625.

13. Kveglis L. I., Dzhes A. V., Volochaev M. N., Cherkov A. G., Noskov F. M. The clusters self-assembled crystal and magnetic structure during the martensite transition in Fe86Mn13C alloy. Journal of Siberian Federal University. Engineering & Technologies. 2015, Vol. 8, No. 1, Р. 48–56.

14. Kraposhin V. S., Talis A. L., Demin E. D., Zaitsev A. I. [Crystal geometry and mechanism of fusion of spinel manganese sulfide in complex non-metallic inclusion]. Metallovedenie i termicheskaya obrabotka metallov. 2015, Vol. 7, Р. 4–12 (In Russ.).

15. Slater J. C., Johnson K. H. Self-consistent field Xα cluster method for polyatomic molecules and solids. Phys. Rev. B. 1972, Vol. 5, No. 3, P. 844–853.

16. Slater J. C. Suggestions from solid-state theory regarding molecular calculations. J. Chem. Phys. 1985, Vol. 43, Р. 228.

17. Nyavro A. V. Evolyutsiya elektronnykh sostoyaniy: atom – molekula – klaster – kristall [Evolution of electronic states: atom-molecule-cluster-crystal]. Tomsk, TGU Publ., 2013, 268 p.

18. Gunnarson O., Lundqvist B. I. Exchange and correlation in atoms, molecules and solids by the spin-density-functional formalism. Phys. Rev. B. 1976, Vol. 13, No. 10, P. 4274–4298.

19. Nemoshkalenko V., Kucherenko N. Metody vychislitel’noy fiziki v teorii tverdogo tela. Elektronnye sostoyaniya v neideal’nykh kristallakh [Methods of computational physics in solid state theory. Electronic states in imperfect crystals]. Kiev, Naukova Dumka Publ., 1986, 296 p.

20. Kveglis L. I., Abylkalykova R. B., Noskov F. M., Arhipkin V. G., Musikhin V. A., Cherepanov V. N., Niavro A. V. Local electron structure and magnetization in β – Fe86Mn13C. Superlattices and Microstructures. 2009, Vol. 46, No. 1–2, Р. 114–120.

21. Kulkova S. E., Valuysky D. V., Smolin I. Y. [Changes in the electronic structure at В2-В19' martensitic transformation in NiTi]. Fizika tverdogo tela. 2001, Vol. 43, No. 4, Р. 706–713 (In Russ.).


Noskov Fedor Mikhailovich – Cand. Sc., Docent, Docent of Department of Materials and Materials Processing

Technologies, Polytechnic Institute, Siberian Federal University. Е-mail: yesoono@yandex.ru.

Nyavro Alexander Vladislavovich – Cand. Sc., Docent, Docent of Department of Plasma Physics, National

Research Tomsk State University. Е-mail: nevr@phys.tsu.ru.

Cherepanov Viktor Nikolayevich – Dr. Sc., Docent of Department of Optics and Spectroscopy, Tomsk State

University. Е-mail: vnch@phys.tsu.ru.

Drozdova Anna Konstantinovna – postgraduate student, Tomsk State University. Е-mail: anna_drozdova709@mail.ru.

Kveglis Lyudmila Iosifovna – Dr. Sc., professor, Siberian Federal University. E-mail: kveglis@list.ru.