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

BOLMARO, RAÚL; 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

Journal of Materials Research and Technology

Elsevier

Año: 2019 vol. 8 p. 3399 - 3414

2238-7854

tIn the present work, we report the preparation of a novel titanium-based alloy, namelyTi25Nb10Zr, by cold crucible levitation melting technique. The cast alloy consists of acomplex microstructure with large Beta phase grains (54%,?50?150 m) with a regularly con-nected net of Alpha(orthorhombic, 46%) phase running along boundaries and across thegrains and keeping a regular misorientation with respect to the Beta phase. An intermeshed51% Alpha and 49% Beta phases with lamellar microstructure were found by annealing. Theelectrochemical tests showed that both alloys were affected by the corrosion process. Agood corrosion resistance in SBF at 37◦C was found for the cast form. The cast alloy is moreresistant when immersed into solutions with pH2 and pH7, while the annealed one is resis-tant in pH5 solution. Surface potential of both alloys is negative, with the annealing processleading to a slight decrease of that property. Collectively, the biological results indicate amore favorable viability on cast form as compared to annealed one, suggesting that the castalloy is promising for biomedical applications.