Actual Problems in Machine Building 2018 Vol. 5 No. 1-2

Актуальные проблемы в машиностроении. Том 5. № 1-2. 2018 Материаловедение в машиностроении ____________________________________________________________________ 105 8. Shock-wave-induced grain refinement and phase state modification in coarse-grained and nanocrystalline titanium / Y.R. Kolobov, S.S. Manokhina, A.Yu. Kolobova et al. // Technical Physics Letters. – 2016. – Vol. 42, N 9. – P. 959–962. 9. Столяров В.В., Угурчиев У.Х., Трубицына И.Б. и др., Интенсивная электропластическая деформация сплава TiNi // Физика и техника высоких давлений. – 2006. – Т. 16, № 4. – С. 48–51. 10. Stolyarov V.V. Deformability and nanostructuring of shape memory TiNi alloys during the electroplastic rolling // Materials Science & Engineering A. – 2009. – Vol. 503. – P. 18–20. 11. Лесюк Е.А., Алехин В.П. Формирование нано- и субмикрокристаллических структур в инструментальных и конструкционных материалах и обеспечение их термической стабильности: монография. – М.: МГИУ, 2009. – 247 с. 12. Mordyuk B., Prokopenko G. Ultrasonic impact peening for the surface properties’ management // Journal of Sound and Vibration. – 2007. – Vol. 308. – P. 855–866. 13. Дефекты структуры и мезорельеф поверхности никелида титана после интенсивной пластической деформации ультразвуковым методом / А.И. Лотков, А.А. Батурин, В.Н. Гришков и др. // Физическая мезомеханика. – 2005ю – № 8. – С. 109–112. 14. Shape memory alloys: fundamentals, modeling and applications / ed. by V. Brailovski, S. Prokoshkin, P. Terriault and F. Trochu. – Montreal, Quebec, Canada: Ecole de Technologie Superieure, Université du Québec, 2003. – 844 p. 15. Cismasiu C. Shape memory alloys. – Rijeka, Crotia: Sciyo, 2010. – 218 р. SURFACE AND BULK NANOSTRUCTURING OF TI-BASED ALLOYS Stolyarov V. V., D.Sc. (Engineering), Professor, e-mail: vlstol@mail.ru Mechanical Engineering Research Institute of the Russian Academy of Sciences, 4 Maly Kharitonyevsky Pereulok, Moscow, 101990, Russian Federation Abstract The paper presents the results of the investigation of the ultrasonic surface hardening treatment effect on the structure and mechanical properties of ultrafine-grained titanium alloys –commercially pure (CP) titanium VT1-0 and a stoichiometric shape memory Ti 49.3 Ni 50.7 alloy . Optical and transmission electron microscopy has shown that in a surface layer of thickness up to 20 μm an ultrasonic surface hardening treatment in coarse-grained titanium forms a nanostructure with a grain size of less than 100 nm, and in nanostructured Ti 49.3 Ni 50.7 further reduces the grain size from 100 to 30 nm. The ultrasonic surface hardening treatment of alloys multiply increases the strength, micro- and nanohardness of the surface layer, reduces the roughness and forms a gradient nanostructure, ensuring an increase in durability and expansion of the functionality of products. Keywords nanostructure, electropulse rolling, nanohardness, ultrasonic surface hardening