Investigations of the thermal stability of the microstructure of titanium produced by intense plastic deformation

Abstract

669.295:539.5 I. V. Nelasov, and S. S. ManokhinThe results of theoretical and experimental studies of the mechanisms of diffusion-controlled processes in nanostructured metals and alloys available in the literature and obtained by the authors are discussed. The molecular dynamic method was used in the context of a modified embedded-atom method was used to investigate the process of collective recrystallization of nanocrystalline titanium. An analytical description of the recrystallization kinetics has been proposed which takes into account the contributions of triple joints to the thermodynamic driving force. Methods of transmission, including high-resolution, electron microscopy were used to examine the kinetics of collective recrystallization in nanostructured titanium VT1-0. The temperature dependence and values of the activation energy for collective recrystallization have been determined. Problems of practical implementation of nanostructured unalloyed titanium in medicine are discussed.

Properties and Performance of Ultrafine Grained Titanium for Biomedical Applications

“…The UFG material keeps the advantages of cpTi concerning corrosion resistance, biocompatibility and osseointegration and, at the same time, achieves strength levels comparable to those of Ti alloys thanks to the use of the SPD (Severe Plastic Deformation), Figure 10, for grain refinement [3][4][5][6][51][52][53][54][55][56][57][58][59] .…”

Effect of Processing by Femtosecond Pulsed Laser on Mechanical Properties of Submicrocrystalline Titanium

“…Such an advantage makes it possible to modify thin surface layers in the absence of heating of bulk mate-rial, which, normally, leads to a decrease in mechanical strength due to degradation of the SMC and NS states or complete elimination of such states owing to the reverse processes and recrystallization. Thus, the application of femtosecond lasers is important for modification of the surface of titanium alloys in the SMC and NS states, since the development of the above processes at relatively high temperatures leads to a decrease in the strength of the materials typical of course-grain structures [3,4].…”

Investigations of the thermal stability of the submicrocrystalline titanium

“…One of the perspective materials for fabrication of various implants for stomatology, traumatic surgery, and podiatric medicine is nanostructural and submicrocrystalline pure titanium Grade 2, Grade 4, and VT1-0) [3,4]. The unique feature of NS unalloyed titanium, compared to other technically pure metals in the nanostructural state (with the melting joint close to titanium), is a high thermal stability of a nanostructure [5]. That makes it possible to conduct annealing to reduce the macroscopic stresses in rods and profiles of NS titanium, providing stability of the metal structure to a climatic action and high properties of articles for a long time of functioning at the temperature of the human body.…”