The mechanical properties, strain rate sensitivity (m) and deformation activation volume (ΔV) are investigated at the experimental temperatures from 20 to 400°С in a Ti50Ni50 alloy in a coarse-grained (CG) state with the austenite grain size D = 200 μm and in an ultrafine-grained (UFG) state with D = 700 μm following an ECAP treatment. It is observed that this treatment improves the yield strength of the alloy compared to its CG-state. The strain rate sensitivity, m, is found to be by a factor of 1.5–2 higher than that of CG-specimens; it increases with the temperature in both states of the material. As the temperature of the material in tension increases up to Т = 150–250°С, parameter ΔV increases to its maximum and with a further growth of the experimental temperature to 400°С, parameter ΔV decreases. The deformation activation volume of the alloy in the UFG-state is by a factor of 2–4 larger than that in the CG-state for the same experimental temperatures.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
V. N. Khachin, V. G. Pushin, and V. V. Kondratiev, Titanium Nickelide: Structure and Properties [in Russian], Moscow, Nauka (1992).
V. Brailovski, S. Prokoshkin, P. Terriault, and F. Trochu, Shape Memory Alloys: Fundamentals, Modeling and Applications, Montreal: Ecole de Technologie Superieure (ETS), Universite du Quebec, Canada (2003).
R. Z. Valiev, Nature Mater., 3, 511–516 (2004).
R. Z. Valiev and I. V. Aleksandrov, Bulk Nanostructured Metallic Materials. Manufacture, Structure and Properties [in Russian], Moscow, Akademkniga (2007).
V. G. Pushin, R. Z. Valiev and Y. T. Zhu, Mater. Trans., 47, 694–697 (2006).
V. V. Stolyarov, Pis’ma Mater., 1, 75–77 (2011).
V. G. Pushin, V. V. Stolyarov, D. V. Gunderov, et al., Mater. Sci. Eng. A, 410– 411, Iss. 25, 386–389 (2005).
D. Gunderov, A. Lukyanov, E. Prokofiev, and V. Pushin , Eur. Phys. J. Special Topics, 158, 53–58 (2008).
R. Z. Valiev, D. V. Gunderov, A. V. Lukyanov, and V. G. Pushin, J. Mater. Sci., 47, Iss. 22, 7848–7853 (2012).
E. F. Dudarev, R. Z. Valiev, Yu. R. Kolobov, et al., Phys. Metals Metallogr., 107, Iss. 3, 298–311 (2009).
A. A. Churakova, D. V. Gunderov, A. V. Lukyanov, and Yu. A. Lebedev, Pis’ma Mater., 3, 166–168 (2013).
R. I. Babicheva and Kh. Ya. Mulyukov, Pis’ma Mater., 2, 156–161 (2011).
Kh. Ya. Mulyukov and R. I. Babicheva, Pis’ma Mater., 2, 186–190 (2012).
P. Rodriguez, Metallurg. Mater. Trans. A, 35, Iss. 9, 2697–2705 (2004).
I. I. Novikov and V. K. Portnoi, Superplasticity of Alloys with Ultrafine Grains [in Russian], Moscow, Metallurgiya (1981).
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 116–120, June, 2015.
Rights and permissions
About this article
Cite this article
Gunderov, D.V., Churakova, A.A., Lukianov, A.V. et al. Investigation of the Deformation Activation Volume of an Ultrafinegrained Ti50Ni50 Alloy. Russ Phys J 58, 864–868 (2015). https://doi.org/10.1007/s11182-015-0583-9
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11182-015-0583-9