EFFECT OF HOT ROLLING ON MICROSTRUCTURE AND TENSILE PROPERTIES OF TINBZRTAO ALLOY

1 PREISLER Dalibor
Co-authors:
1 STRÁSKÝ Josef 1 HARCUBA Petr 1 JANEČEK Miloš
Institution:
1 Charles University in Prague, Faculty of Mathematics and Physics, Department of Physics of Materials, Ke Karlovu 5, 121 16, Praha 2, Czech Republic, preisler.dalibor@gmail.com, josef.strasky@gmail.com, harcuba.p@seznam.cz, janecek@met.mff.cuni.cz
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
1905-1910
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
27 views / 7 downloads
Abstract

Biocompatible β-titanium alloy Ti35.3Nb7.3Zr5.7Ta0.7O (wt.%) shows high strength and reduced elastic modulus when compared to commercial alloys for total joint endoprostheses (e.g. Ti6Al4V). However, in the as-cast condition, porosity, dendritic chemical inhomogeneities and coarse grain structure negatively influence mechanical properties and therefore sequential thermo-mechanical treatment is necessary. Studied material (as-cast rod) was processed by hot rolling at 1200°C and three conditions with different diameter reduction were prepared. Scanning electron microscopy (SEM) along with electron back-scatter diffraction (EBSD) was employed to characterize resulting microstructure. Tensile tests and microhardness measurements were used to evaluate room temperature mechanical properties. SEM showed that porosity is removed by hot rolling and EBSD revealed deformed grain structure that is partially recrystallized in the center of each rod. There is a clear difference between the grain sizes of the three states in the center of rods. Yield strength exceeding 1050 MPa, ultimate tensile strength of values over 1200 MPa and plastic elongation > 20% in all three studied conditions indicate that hot-rolled Ti35.3Nb7.3Zr5.7Ta0.7O alloy can be used for implant manufacturing.

Keywords: Beta titanium, EBSD, deformation, recrystallization
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