Young’s modulus of titanium alloy VT6S and its structural sensitivity

R.Y. Lutfullin, E.A. Trofimov show affiliations and emails
Received: 11 November 2016; Revised: 14 February 2017; Accepted: 15 February 2017
This paper is written in Russian
Citation: R.Y. Lutfullin, E.A. Trofimov. Young’s modulus of titanium alloy VT6S and its structural sensitivity. Lett. Mater., 2017, 7(1) 12-16


According to literature data, values of Young’s modulus, E, measured in a two-phase titanium alloy VT6 (Ti-6Al-4V) can vary from 90 to 145 GPa. Elasticity modulus is an important material parameter, which enters the basic equations describing the structural strength of materials. Due to such a wide scatter of E values, there is a problem of a correct choice of this parameter for the strength analyses of responsible aircraft structures. This also makes doubtful the accuracy of computational models assuming a constancy and structural insensivity of Young’s modulus of an alloy used. An absence of systematic data in this field requires carrying out experiments, which would allow one to estimate the stability of elastic and strength properties of VT6-type two-phase titanium alloys subjected to long term processing at superplastic deformation temperatures, i.e. about 900 °C. Experiments carried out in the present paper have shown that long-term vacuum annealing of sheet titanium alloy VT6S with an initial average grain size of 1 µm at 900 °C for 50 hours leads to a considerable, about 14%, reduction in Young’s modulus. The average grain size increases up to 6 µm during 50 hours annealing. Along with the reduction of elastic properties, a considerable, about 14% too, decrease in the room temperature tensile strength has been found. Vacuum annealing at 900 °C preserves the existing anisotropy of mechanical properties, which is inherited due to a weak change of the original crystallographic texture. The revealed change of mechanical properties in sheet of titanium alloy VT6S after vacuum annealing correlates with structural changes including changes in phase composition and crystallographic texture.

References (17)

1. V. S. Zolotorevski. Mechanical properties of metals: Tutorial for universities. M., Metallurgy, 1983. 352 p. (in Russian) [В. С. Золоторевский. Механические свойства металлов: Учебник для вузов. М., Металлургия, 1983. 352 с.].
2. G. E. Fougere, L. Riester, M. Ferber, et al. Mat. Sci. Eng. A204, 1 - 6 (1995). Crossref
3. M. I. Alymov. Technology metals. 3, 8 (2000) (in Russian) [М. И. Алымов. Технология металлов. 3, 8 (2000)].
4. N. I. Noskova, R. R. Mulyukov. Submicrocrystalline and nanocrystalline metals and alloys. Ekaterinburg, UB RAS, 2003. 279 p. (in Russian) [Н. И. Носкова, Р. Р. Мулюков. Субмикрокристаллические и нанокристаллические металлы и сплавы. Екатеринбург, УрО РАН, 2003. 279 с.].
5. O. R. Valiakhmetov, R. M. Galeyev, R. M. Imayev, et al. Nanotechnologies in Russia. 5 (1-2) 102 (2010). Crossref
6. O. A. Kaibyshev. Superplasticity of commercial alloys. M., Metallurgy, 1984. 264 p. (in Russian) [О. А. Кайбышев. Сверхпластичность промышленных сплавов. М., Металлургия, 1984. 264 с.].
7. G. A. Salischev, R. M. Galeyev, O. R. Valiakhmetov, et al. Journal of Materials Processing Technology. 116 (2-3) 265 (2001). Crossref
8. S. A. Saltykov. Stereometric metallography. M., Metallurgy, 1976. 272 p. (in Russian) [С. А. Салтыков. Стереометрическая металлография. М., Металлургия, 1976. 272 с.].
9. E. A. Trofimov, R. U. Shayakhmetov, R. Ya. Lutfullin. Advanced materials. Special issue (15) 124 (2013). (in Russian) [Е. А. Трофимов, Р. У. Шаяхметов, Р. Я. Лутфуллин. Перспективные материалы. Специальный выпуск (15). 124 (2013)].
10. R. Ya. Lutfullin, O. A. Kaibyshev, O. R. Valiakhmetov, et al. Journal of Advanced materials. 10 (4) 326 (2003).
11. R. Ya. Lutfullin, M. Kh. Mukhametrakhimov. Metal science and heat treatment. 2 11 (2006). Crossref
12. E. A. Trofimov, R. Ya. Lutfullin, R. M. Kashaev. Letters on materials. 5 (1) 67 (2015). Crossref
13. E. A. Trofimov, T. R. Lutfullin, V. D. Sitdikov, R. M. Kashaev. Materials of the Russian Science Conference «Mavlutova reading», vol. 7. Ufa. (2016) p. 126 - 128. (in Russian) [Е. А. Трофимов, Т. Р. Лутфуллин, В. Д. Ситдиков, Р. М. Кашаев. Труды Российской научно-технической конференции «Мавлютовские чтения», том 7. Уфа. 2016. С. 126 - 128.].
14. I. Sen, U. Ramamurty. Scripta Materialia. 62 37 (2010). Crossref
15. I. P. Semenova, L. R. Saitova, R. K. Islamgaliev, et al. The Physics of Metals and Metallography. 100 (1) 66 (2005).
16. ASTM F 2066 Standart Specification for Wrought Titanium-15Molybdenum Alloy for Surgical Implant Applications (UNS R58150) - Annual Book of ASTM Standarts, ASTM International, West Conshohocken, PA, 2013. 5 p.
17. S. Ya. Betsofen, V. G. Smirnov, A. A. Ashmarin, A. A. Shaforostov. Titanium. 2 16 (2010) (in Russian) [С. Я. Бецофен, В. Г. Смирнов, А. А. Ашмарин, А. А. Шафоростов. Титан. 2 16 (2010)].

Cited by (2)

Z. Zhang, L. Sang, J. Huang, L. Wang, Y. Koide, S. Koizumi, M. Liao. Carbon. 200, 401 (2022). Crossref
O. Smirnov Maksim, M. Zolotov Alexandr, A. Tatiana, Y. Raskatov Evgeniy. Materials Today: Proceedings. 30, 700 (2020). Crossref

Similar papers