Сombined SPD techniques for fabrication of nanostructured Ti rods for medical applications

Gulnaz H. Salimgareeva 1,  Vladimir V. Latysh 2,  Irina Semenova 2,  Ruslan Z. Valiev 2

1. Institute of Physics of Advaced Materials, Ufa State Aviation Technical University (IPAM USATU), 12 K. Marx st., Ufa 450000, Russian Federation
2. Institute of Physics of Advaced Materials, Ufa State Aviation Technical University (IPAM USATU), 12 K. Marx st., Ufa 450000, Russian Federation

Abstract

In this paper we present the results of investigation aimed at the development of technological processing methods of nanostructured materials for structural application. It is suggested to use a few types of deformation, including severe plastic deformation (SPD) and thermomechanical treatment, to process high physical mechanical properties formation in bulk billets.
The paper studies the effect of combined treatment regime on the microstructure and mechanical properties of semi-products out of CP Ti. The preliminary deformation of CP Ti Grade 2 resulted in alpha-phase grain decrease from 50 mkm to 1 mkm, which contributed to the alloy deformability enhancement during ECAP. At the same time, the possibility appeared to decrease the number of ECAP passes leading to processing of homogeneous ultrafine-grained (UFG) state and, finally, to decreasing of structure anisotropy and the alloy properties enhancement.
The investigation considered the features of UFG structure formation in billets, evolution of mechanical properties at various stages of technological process. It was established that the formation of homogeneous UFG structure in semi-product out of CP Ti enabled to enhance strength properties by 2-2.5 times and preserve sufficient ductility values.

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Presentation: poster at E-MRS Fall Meeting 2005, Symposium I, by Gulnaz H. Salimgareeva
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-03-16 07:27
Revised:   2005-03-16 07:34
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