Formation of ultrafine-grained structure in metallic materials using severe plastic deformation techniques leads to modification of their properties and makes potential areas of their application much broader. A considerable progress in recent years has been achieved in the sphere of fabrication of semi-products from nanostructured commercially pure titanium [1, 2]. High strength and fatigue endurance of nanostructured titanium makes this material very attractive for medicine. In this work, beside investigation of mechanical properties and microstructure parameters, a special attention was paid to biomedical studies and advantages of application of nanostructured titanium in medicine, particularly for dental implants. Formation of a nanostructure in titanium Grade 4 was conducted using the ECAP-Conform technique and subsequent drawing. Semi-products from nanostructured titanium Grade 4 had the ultimate tensile strength of 1300 MPa and fatigue endurance limit of 620 MPa at a load of 107 cycles. Samples of nanostructured and coarse-grained titanium were subjected to surface modification using the mechanical polishing and acid etching. Study of surface topography after surface modification was performed. Corrosion properties of titanium in an artificial physiological solution were analysed with a use of a cyclic voltammetry technique. It was demonstrated that the surface topography and properties of an oxide layer of titanium influence the bio-compatibility parameters. And nanostructured titanium possesses enhanced bio-compatibility as compared to the coarse-grained one. Thus, a combination of high strength and fatigue properties as well as enhanced bio-compatibility of nanostructured titanium makes it an attractive material for medical implants.
1. R.Z. Valiev, I.P. Semenova, V.V. Latysh, H. Rack, T.C. Lowe, J. Petruzelka, L. Dluhos, D. Hrusak, J. Sochova, Nanostructured titanium for biomedical applications, Adv. Eng. Mater., 10, No. 8 (2008), pp.B15-B17.
2. D.V. Gunderov, A.V. Polyakov, I.P. Semenova, G.I. Raab, A.A. Churakova, E.I. Gimaltdinova, I. Sabirov, J. Segurado, V.D. Sitdikov, I.V. Alexandrov, N.A. Enikeev, R.Z. Valiev. Evolution of microstructure, macrotexture and mechanical properties of commercially pure Ti during ECAP-conform processing and drawing. Mater Sci & Eng A 562 (2013) pp. 128–136