Publikationen

Influence of annealing on microstructure and mechanical properties of ultrafine-grained Ti45Nb

Autor(en)
B. Völker, V. Maier-Kiener, K. Werbach, T. Müller, S. Pilz, M. Calin, J. Eckert, A. Hohenwarter
Abstrakt

Beta-Ti alloys have been intensively investigated in the last years because of their favorable low Young's moduli, biocompatibility and bio-inertness, making these alloys interesting candidates for implant materials. Due to their low mechanical strength, efforts are currently devoted to increasing it. A promising way to improve the strength is to tailor the microstructure using severe plastic deformation (SPD). In this investigation high pressure torsion was used to refine the microstructure of a Ti-45wt.%Nb alloy inducing a grain size of ~50 nm. The main focus of the subsequent investigations was devoted to the thermal stability of the microstructure. Isochronal heat-treatments performed for 30 min in a temperature range up to 500 °C caused an increase of hardness with a peak value at 300 °C before the hardness decreased at higher temperatures. Simultaneously, a distinct temperature-dependent variation of the Young's modulus was also measured. Tensile tests revealed an increase in strength after annealing compared to the SPD-state. Microstructural investigations showed that annealing causes the formation of α-Ti. The findings suggest that the combination of severe plastic deformation with subsequent heat treatment provides a feasible way to improve the mechanical properties of SPD-deformed β-Ti alloys making them suitable for higher strength applications.

Organisation(en)
Dynamik Kondensierter Systeme
Journal
Materials and Design
Band
179
Anzahl der Seiten
11
ISSN
0264-1275
DOI
https://doi.org/10.1016/j.matdes.2019.107864
Publikationsdatum
10-2019
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ÖFOS 2012
205019 Materialwissenschaften
ASJC Scopus Sachgebiete
Materials Science(all), Mechanics of Materials, Mechanical Engineering
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/influence-of-annealing-on-microstructure-and-mechanical-properties-of-ultrafinegrained-ti45nb(318bc386-1626-428e-b79c-647a5ad73c26).html