Mechanical properties, structural and texture evolution of biocompatible Ti–45Nb alloy processed by severe plastic deformation

A. Panigrahi , B. Sulkowski , Thomas Waitz , Kadir Ozaltin , Witold Chromiński , A. Pukenas , J. Horky , Małgorzata Lewandowska , Werner Skrotzki , M. Zehetbauer


Biocompatible β Ti–45Nb (wt%) alloys were subjected to different methods of severe plastic deformation (SPD) in order to increase the mechanical strength without increasing the low Young׳s modulus thus avoiding the stress shielding effect. The mechanical properties, microstructural changes and texture evolution were investigated, by means of tensile, microhardness and nanoindentation tests, as well as TEM and XRD. Significant increases of hardness and ultimate tensile strength up to a factor 1.6 and 2, respectively, could be achieved depending on the SPD method applied (hydrostatic extrusion – HE, high pressure torsion – HPT, and rolling and folding – R&F), while maintaining the considerable ductility. Due to the high content of β-stabilizing Nb, the initial lattice structure turned out to be stable upon all of the SPD methods applied. This explains why with all SPD methods the apparent Young׳s modulus measured by nanoindentation did not exceed that of the non-processed material. For its variations below that level, they could be quantitatively related to changes in the SPD-induced texture, by means of calculations of the Young׳s modulus on basis of the texture data which were carefully measured for all different SPD techniques and strains. This is especially true for the significant decrease of Young׳s modulus for increasing R&F processing which is thus identified as a texture effect. Considering the mechanical biocompatibility (percentage of hardness over Young׳s modulus), a value of 3–4% is achieved with all the SPD routes applied which recommends them for enhancing β Ti-alloys for biomedical applications.

Author A. Panigrahi - [Universitat Wien]
A. Panigrahi,,
, B. Sulkowski - [Universitat Wien]
B. Sulkowski,,
, Thomas Waitz - [Universitat Wien]
Thomas Waitz,,
, Kadir Ozaltin (FMSE / DMD)
Kadir Ozaltin,,
- Division of Materials Design
, Witold Chromiński (FMSE / DMD)
Witold Chromiński,,
- Division of Materials Design
, A. Pukenas - [Technical University of Dresden (TU Dresden)]
A. Pukenas,,
- Technische Universität Dresden
, J. Horky - [Universitat Wien]
J. Horky,,
, Małgorzata Lewandowska (FMSE / DMD)
Małgorzata Lewandowska,,
- Division of Materials Design
, Werner Skrotzki - [Technical University of Dresden (TU Dresden)]
Werner Skrotzki,,
- Technische Universität Dresden
, M. Zehetbauer - [Universitat Wien]
M. Zehetbauer,,
Journal seriesJournal of the Mechanical Behavior of Biomedical Materials, ISSN 1751-6161
Issue year2016
ASJC Classification2211 Mechanics of Materials; 2204 Biomedical Engineering; 2502 Biomaterials
Languageen angielski
Score (nominal)35
Score sourcejournalList
ScoreMinisterial score = 30.0, 10-06-2020, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 10-06-2020, ArticleFromJournal
Publication indicators Scopus Citations = 27; WoS Citations = 11; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.409; WoS Impact Factor: 2016 = 3.11 (2) - 2016=3.544 (5)
Citation count*
Share Share

Get link to the record

* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
Are you sure?