1. Department of Light Alloys, Institute for Metals Superplasticity Problems of Russian Academy of Science, 39 St. Khalturin Str., Ufa 450001, Russia (Corresponding author), e-mail: sitdikov.oleg@imsp.ru, https://orcid.org/0000-0001-7617-3926
2. Department of Light Alloys, Institute for Metals Superplasticity Problems of Russian Academy of Science, 39 St. Khalturin Str., Ufa 450001, Russia