1. Institute for Metals Superplasticity Problems of the Russian Academy of Sciences; Khalturina st. 39 Ufa 450001 Russia
2. Bashkir State University; Zaki Validi St. 32 Ufa 450076 Russia
3. Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences; Vernadsky pr. 101-1 Moscow 119526 Russia
4. National Research Tomsk State University; Lenin Ave 36 Tomsk 634050 Russia