from the conferences organized by TANGER Ltd. provisional website
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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