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    Investigation of cast and annealed Ti25Nb10Zr alloy as material for orthopedic devices

    Year: 2019

    Journal: J. Mater. Res. Technol-JMRT, Volume 8, JUL-AUG, page 3399–3414

    Authors: Bolmaro, Raul; Parau, Anca C.; Pruna, Vasile; Surmeneva, Maria A.; Constantin, Lidia R.; Avalos, Martina; Cotrut, Cosmin M.; Tutuianu, Raluca; Braic, Mariana; Cojocaru, Danut, V; Dan, Ioan; Croitoru, Sorin; Surmenev, Roman A.; Vladescu, Alina

    Organizations: Romanian National Authority for Scientific Research, CNCS-UEFISCDI within PNCDI III [PN-II-PT-PCCA-2014-212, 68/2018]

    Keywords: Corrosion resistance; SBF; Surface potential; Viability

    In the present work, we report the preparation of a novel titanium-based alloy, namely Ti25Nb10Zr, by cold crucible levitation melting technique. The cast alloy consists of a complex microstructure with large Beta phase grains (54%, (5) over tilde0-150 mu m) with a regularly connected net of Alpha' (orthorhombic, 46%) phase running along boundaries and across the grains and keeping a regular misorientation with respect to the Beta phase. An intermeshed 51% Alpha and 49% Beta phases with lamellar microstructure were found by annealing. The electrochemical tests showed that both alloys were affected by the corrosion process. A good corrosion resistance in SBF at 37 degrees C was found for the cast form. The cast alloy is more resistant when immersed into solutions with pH2 and pH7, while the annealed one is resistant in pH5 solution. Surface potential of both alloys is negative, with the annealing process leading to a slight decrease of that property. Collectively, the biological results indicate a more favorable viability on cast form as compared to annealed one, suggesting that the cast alloy is promising for biomedical applications. (C) 2019 The Authors. Published by Elsevier B.V.
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