Crystal chemical analysis of interfaces «niobic matrix–silicide Nb5Si3» in natural composites of Nb–Si

Kuzmina N.A., Svetlov I.L., Zaysev D.V., Zavodov A.V.
UDC
669.293
DOI
10.18577/2307-6046-2018-0-12-14-24
Article PDF (Russian) (851.24 KB)
How to cite
Kuzmina N.A., Svetlov I.L., Zaysev D.V., Zavodov A.V. Crystal chemical analysis of interfaces «niobic matrix–silicide Nb5Si3» in natural composites of Nb–Si // Proceedings of VIAM. 2018. No. 12. DOI: 10.18577/2307-6046-2018-0-12-14-24. URL: https://test.viam.ru/en/journal/2018/12/2
Keywords
Nb–Si natural composites, heat-resistant alloys, x-ray phase analysis, crystal chemical analysis, lattice of matching nodes.
Abstract

The interface in natural Nb-Si composites is analyzed for three structural modifications of Nb5Si3.On the basis of the crystal-chemical analysis of the phase conjugation surfaces, using the concept of the lattice of matching nodes, the value of the discrepancy in the interatomic distance of the mating planes is determined and the conclusion is made about the mechanisms of compensation of the lattice mismatch, the degree of deformation of the crystal lattices and the possibility of diffusion processes on the interface for Nb–Si composites with different modifications of the silicide.

Based on the crystal-chemical analysis of the interfacial boundary in the composite Nb–α-Nb5Si3 using the concept of a lattice of coincident nodes, the value of the discrepancy between the interatomic distances in the mating planes is determined: it is 3.8% in a series of atoms perpendicular to the direction of growth, and an order of magnitude less – 0.4% - along the direction of growth. At small (less than 10%) mismatch values, compensation at the interface can occur due to elastic deformations of the mating re-grids, without defects in the crystal structure.

In the composite Nb–β-Nb5Si3 based on the difference of average interatomic distances in the matrix of Nb and the silicide β-Nb5Si3, the value of the dimensional mismatch of the adjacent lattices is at 7.8%. For interphase boundaries with a mismatch of less than 10%, compensation can be achieved by elastic deformation and the formation of an average lattice with a period of ~3Å without defects in the crystal structure.

Crystallochemical analysis of the planes of the interfa

Reference list
  1. Ospennikova O.G. Tendencii sozdaniya zharoprochnyh nikelevyh splavov nizkoj plotnosti s polikristallicheskoj i monokristallicheskoj strukturoj (obzor) [Tendencies of development of heat-resistant nickel alloys of low density with polycrystalline and single-crystal structures (review)] // Aviacionnye materialy i tehnologii. 2016. №1 (40). S. 3–19. DOI: 10.18577/2071-9140-2016-0-1-3-19.
  2. Ospennikova O.G. Itogi realizacii strategicheskih napravlenij po sozdaniyu novogo pokoleniya zharoprochnyh litejnyh i deformiruemyh splavov i stalej za 2012–2016 gg. [Implementation results of the strategic directions on creation of new generation of heat-resisting cast and wrought alloys and steels for 2012–2016] // Aviacionnye materialy i tehnologii. 2017. №S. S. 17–23. DOI: 10.18577/2071-9140-2017-0-S-17-23.
  3. Bazyleva O.A., Ospennikova O.G., Arginbaeva E.G., Letnikova E.Yu., Shestakov A.V. Tendencii razvitiya intermetallidnyh splavov na osnove nikelya [Development trends of nickel-based intermetallic alloys] // Aviacionnye materialy i tehnologii. 2017. №S. S. 104–115. DOI: 10.18577/2071-9140-2017-0-S-104-115.
  4. Kablov E.N., Svetlov I.L., Efimochkin I.Yu. Vysokotemperaturnyye Nb–Si-kompozity [High-Temperature Nb – Si Composites] // Vestnik MGTU im. N.E. Baumana. Ser.: Mashinostroyenie. 2011. №SP2. S. 164–173.
  5. Svetlov I.L., Kuzmina N.A., Neyman A.V. i dr. Vliyaniye skorosti kristallizatsii na mikrostrukturu, fazovyy sostav i prochnost' in-situ kompozita Nb/Nb5Si3 [Influence of the crystallization rate on the microstructure, phase composition and in-situ strength of the Nb/Nb/Nb5Si3 composite] // Izvestiya Rossiyskoy akademii nauk. Ser.: Fizicheskaya. 2015. T. 79. №9. S. 1294–1299.
  6. Timofeyeva O.B., Kolodochkina V.G., Shvanova N.F., Neiman A.V. Issledovanie mikrostruktury vysokotemperaturnogo estestvenno kompozicionnogo materiala na osnove niobija, uprochnennogo intermetallidami silicida niobiya [The microstructure analysis of niobium-based high-temperature natural composite material reinforced with niobium silicide intermetallics] // Aviacionnye materialy i tehnologii. 2015. №1 (34). S. 60–64. DOI: 10.18577/2071-9140-2015-0-1-60-64.
  7. Shchetanov B.V., Efimochkin I.Yu., Paegle S.V., Karachevtsev F.N. Issledovanie vysokotemperaturnoj prochnosti in-situ-kompozitov na osnove Nb, armirovannyh monokristallicheskimi voloknami α-Al2O3 [Study of high-temperature strength of Nb–Si–Ti in-situ-composites reinforced by single-crystal α-Al2O3] // Aviacionnye materialy i tehnologii. 2016. №3 (42). S. 53–59. DOI: 10.18577/2071-9140-2016-0-3-53-59.
  8. Loshhinin Yu.V., Dmitrieva V.V., Pahomkin S.I., Razmahov M.G. Teplofizicheskie svojstva kompaktirovannyh kompozitov sistemy Nb–Si v diapazone temperatur ot 20 do 1400°C [Thermophysical properties of Nb–Si system compact composites with the temperature range from 20 to 1400°C] // Aviacionnye materialy i tehnologii. 2017. №2. S. 41–49. DOI: 10.18577/2071-9140-2017-0-2-41-49.
  9. Kosevich V.M., Iyevlev V.M., Palatnik L.S., Fedorenko A.I. Struktura mezhkristallitnykh i mezhfaznykh granits [Structure of intergranular and interphase boundaries]. M.: Metallurgiya, 1980. S. 256.
  10. Iyevlev V.M., Prizhimov A.S. Mezhzerennyye i mezhfaznyye granitsy v kristallicheskikh materialakh [Intergranular and interphase boundaries in crystalline materials] // Vestnik TGU. T. 15. Vyp. 3. 2010. S. 780–782.
  11. Savitskiy E.M., Efimov Yu.V., Bodak O.I. i dr. Sistema niobiy–kremniy–uglerod [System niobium silicon–carbon] // Neorganicheskiye materialy. 1981. T. 17. №12. S. 2207–2210.
  12. Kocherzhinskiy Yu.A., Yupko L.M. Shishkin E.A. Diagramma sostoyaniya Nb–Si [Kocherzhinsky Yu.A., Yupko L.M. Shishkin, E.A. Nb–Si state diagram] // Izvestiya akademii nauk SSSR. Ser.: Metally. 1980. S. 206–211.
  13. Aronsson B. The crystal structure of Mo5Si3 and W5Si3 // Acta Chemica Scandinavica. 1955. Vol. 9. Р. 1107–1110.
  14. Schachner H., Cerwenka E., Nowotny H.N. Neue Silizide vom M5Si3-Typ mit D 88-Struktur // Journal of the American Ceramic Society. 1982. Vol. 65. P. 260–265.
  15. Svetlov I.L. Vysokotemperaturnyye Nb–Si kompozity [High-Temperature Nb–Si Composites] // Materialovedeniye. 2010. №9–10. S. 18–38.
  16. Xiao Ma, Xiping Guo, Maosen Fu, Haisheng Guo. Crystallographic characteristics of an integrally directionally solidified Nb–Ti–Si based in-situ composite // Scripta Materialia. 2017. Vol. 139. P. 108–113.
  17. Sekido N., Hildal K., Sakidja R., Perepezko J.H. Stability of the Nb5Si3 phase in the Nb–Mo–Si system // Intermetallics. 2013. Vol. 41. P. 104–112.
  18. Wang F., Luo L., Meng X. et al. Morphological evolution of primary β-Nb5Si3 phase in Nb–Mo–Si alloys // Journal of Alloys and Compounds. 2018. Vol. 741. P. 51–58.
  19. Urusov V.S., Eremin N.N. Atomisticheskoye kompyuternoye modelirovaniye struktury i svoystv neorganicheskikh kristallov i mineralov, ikh defektov i tverdykh rastvorov [Atomistic computer simulation of the structure and properties of inorganic crystals and minerals, their defects and solid solutions]. M.: GEOS, 2012. 428 s.
  20. Kablov E.N., Kuzmina N.A., Eremin N.N., Svetlov I.L., Neyman A.V. Atomnyye modeli struktury silitsidov niobiya v in-situ kompozitakh Nb–Si [Nuclear models of structure of silicides of niobium in in-situ Nb-Si composites] // Zhurnal strukturnoy khimii. 2017. №3. C. 564–570.
  21. Kablov E.N. Innovacionnye razrabotki FGUP «VIAM» GNC RF po realizacii «Strategicheskih napravlenij razvitiya materialov i tehnologij ih pererabotki na period do 2030 goda» [Innovative developments of FSUE «VIAM» SSC of RF on realization of «Strategic directions of the development of materials and technologies of their processing for the period until 2030»] // Aviacionnye materialy i tehnologii. 2015. №1 (34). S. 3–33. DOI: 10.18577/2071-9140-2015-0-1-3-33.
  22. Svetlov I.L., Kuzmina N.A., Zavodov A.V., Zaytsev D.V. Termicheskaya stabilnost poverkhnostey razdela mezhdu niobiyevoy matritsey i g-Nb5Si3 silitsidom v kompozite na osnove sistemy Nb–Si [Thermal stability of interfaces between the niobium matrix and γ-Nb5Si3 silicide in eutectic Nb–Si composites] // Trudy VIAM: elektron. nauch.-tekhnich. zhurn. 2018. №8 (68). St. 03. Available at: http://www.viam-works.ru (accessed: November 12, 2018). DOI: 10.18577/2307-6046-2018-0-8-28-37.
  23. Marchenko E.I., Kuz'mina N.A., Eremin N.N. Lokalizatsiya pozitsij primesej ugleroda v kristallicheskikh strukturakh polimorfnykh modifikatsij Nb5Si3 po dannym atomisticheskogo komp'yuternogo modelirovaniya [Localization of positions of impurity of carbon in crystal structures of polymorphic updatings of Nb5Si3 according to atomistic computer modelling] // Trudy VIAM: elektron. nauch.-tekhnich. zhurn. 2017. №3 (51). St. 04. Available at: http://www.viam-works.ru (accessed: November 12, 2018) DOI: 10.18577/2307-6046-2017-0-3-4-4.