| Issue |
MATEC Web Conf.
Volume 370, 2022
2022 RAPDASA-RobMech-PRASA-CoSAAMI Conference - Digital Technology in Product Development - The 23rd Annual International RAPDASA Conference joined by RobMech, PRASA and CoSAAMI
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|---|---|---|
| Article Number | 03008 | |
| Number of page(s) | 8 | |
| Section | Material Development | |
| DOI | https://doi.org/10.1051/matecconf/202237003008 | |
| Published online | 01 December 2022 | |
Fabrication of a β-based titanium alloy for biomedical applications
1 Advanced Materials Engineering, Council for Scientific and Industrial Research, South Africa
2 School of Chemical and Metallurgical Engineering and DSI-NRF Centre of Excellence in Strong Materials, hosted by the University of the Witwatersrand, South Africa
* Corresponding author: mseerane@csir.co.za
The aim of this study was to produce a titanium-based alloy with mainly β-phase and reduced Young’s modulus for biomedical applications. Alloys Ti-Nbx-Ta5-Zrx5 (x = 20, 30, 40 at.%Nb) were prepared by arc melting then solution annealed at 950℃ for 1 h, and aged at 480℃ for 12 h. Optical microscopy showed mixtures of dendritic and needle-like microstructures before and after heat treatment in all alloys. X-ray diffraction (XRD) identified β-phase in all alloys. Small fractions of orthorhombic martensite (αʹ) and ω-phase were also detected by XRD which decreased after ageing. Alloy Ti-Nb20-Ta5-Zr5 had the lowest Young’s modulus, derived from nanoindentation hardness of 69.8 ± 7.2 GPa in the as cast condition. There was no significant change in elastic modulus of the alloy after ageing (70.8 ± 6.8 GPa). As-cast Ti-Nb30-Ta5-Zr5 had the highest elastic modulus of 94.7 ± 3.0 GPa. The elastic modulus decreased to 84.4 ± 0.32 GPa after heat treatment.
© The Authors, published by EDP Sciences, 2022
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