Optimization of the composition and heat treatment of the cast biocompatible Ti–18Nb–xSi alloys

TitleOptimization of the composition and heat treatment of the cast biocompatible Ti–18Nb–xSi alloys
Publication TypeJournal Article
Year of Publication2016
AuthorsShevchenko, OM, Kulak, LD, Datskevich, OV, Kuzmenko, NN, Khomenko, GE, Firstov, SA
Abbreviated Key TitleDopov. Nac. akad. nauk Ukr.
DOI10.15407/dopovidi2016.02.062
Issue2
SectionMaterials Science
Pagination62-68
Date Published2/2016
LanguageUkrainian
Abstract
The investigation of cast alloys of the $\rm Ti{-}Nb{-}Si$ system with a silicon content of 2% is carried out comparing to the binary alloy $\rm Ti{-}1{\%}\,Si$. The effects of silicon and the quenching temperature on the structure and hardness of the alloys are studied. The studies have shown that, in the alloy $\rm Ti{-}1{\%}\,Si$ and ternary alloys $\rm Ti{-}18Nb{-}\mathit{x} Si$ ($x = 0.6 \div  1.2{\%}$), the martensitic structure of different morphologies and dispersions is formed during the hardening, depending on the heat temperature. In the binary alloy, the large or massive lamellar $\alpha$-phase is formed, while niobium promotes the appearance of $\alpha''$-martensite and the transition to the packet thin plate or needle lens form. The X-ray analysis showed the presence of $\rm Ti_3Si$ silicide in the alloys, the quantity of which depends on the silicon content and quenching temperature. Maximum hardness achieved with the silicon content of 0.8–1.1% and quenching temperatures 1100–1200 ºC.
Keywordshardness, martensite, quenching, silicides, structure, Ti-Si, titanium alloys
References: 
  1. Svechnikov V. N., Kocherzhynskiy U. A., Upko L. M. et al. Dokl. AN SSSR, 1970, 193, No 2: 393–396 (in Russian).
  2. Flower H. M., Swann P. R., West D. R. F. Met. Trans., 1971, 2, No 12: 3289–3297. https://doi.org/10.1007/BF02811609
  3. Frommeyer G., Rozenkranz R., Ludecke C. Zeitschrift für Metallkunde, 1990, 81: 307–313.
  4. Saha R. L., Nandy T. K., Mistra R. D. J. Mater. Sci., 1991, 26: 2637–2644. https://doi.org/10.1007/BF02387731
  5. Firstov S. A. Mekhanika ruinuvannya materialiv i mitsnist konstruktsiy, Ed. V.V. Panasuk, Lviv: FMI NAN Ukrainy, 2004: 609–616 (in Ukrainian).
  6. Bulanova M. V. Phase equilibria in the multicomponent Ti−Si-based systems, The Doctor of Science thesis, Kyiv, 2005 (in Ukrainian).
  7. Bega N. D., Datskevsch O. V., Kotko A. V. et al. Metallophizika i noveyshye tehnologii, 2006, 28: 157–164 (in Russian).
  8. Firstov S. A., Tkachenko S. V., Kuzmenko N. N. MiTOM, 2009, No 1: 14–20 (in Russian).