title: Increasing strength of a biomedical Ti-Nb-Ta-Zr alloy by alloying with Fe, Si and O.
abstract: Low-modulus biomedical beta titanium alloys often suffer from low strength which limits their use as load-bearing orthopaedic implants. In this study, twelve different Ti-Nb-Zr-Ta based alloys alloyed with Fe, Si and O additions were prepared by arc melting and hot forging. The lowest elastic modulus (65GPa) was achieved in the benchmark TNTZ alloy consisting only of pure β phase with low stability due to the 'proximity' to the β to α'' martensitic transformation. Alloying by Fe and O significantly increased elastic modulus, which correlates with the electrons per atom ratio (e/a). Sufficient amount of Fe/O leads to increased yield stress, increased elongation to fracture and also to work hardening during deformation. A 20% increase in strength and a 20% decrease in the elastic modulus when compared to the common Ti-6Al-4V alloy was achieved in TNTZ-Fe-Si-O alloys, which proved to be suitable for biomedical use due to their favorable mechanical properties.
authors.affiliation: Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 121 16 Prague 2, Czech Republic.
authors.forename: Josef
authors.initials: J
authors.lastname: Stráský
authors.affiliation: Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 121 16 Prague 2, Czech Republic.
authors.forename: Petr
authors.initials: P
authors.lastname: Harcuba
authors.affiliation: Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 121 16 Prague 2, Czech Republic.
authors.forename: Kristína
authors.initials: K
authors.lastname: Václavová
authors.affiliation: Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 121 16 Prague 2, Czech Republic.
authors.forename: Klaudia
authors.initials: K
authors.lastname: Horváth
authors.affiliation: Institute of Thermomechanics, Academy of Sciences of the Czech Republic, Dolejskova 5, 182 00 Prague 8, Czech Republic.
authors.forename: Michal
authors.initials: M
authors.lastname: Landa
authors.affiliation: Structural and system diagnostic, Research Centre Rez, Hlavni 130, Husinec-Rez, Czech Republic.
authors.forename: Ondřej
authors.initials: O
authors.lastname: Srba
authors.affiliation: Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 121 16 Prague 2, Czech Republic.
authors.forename: Miloš
authors.initials: M
authors.lastname: Janeček
mesh_terms: D000497:Alloys / Q000032:analysis*; D001672:Biocompatible Materials / Q000032:analysis*; D055119:Elastic Modulus; D007501:Iron; D008422:Materials Testing; D009556:Niobium; D010100:Oxygen; D012825:Silicon; D013635:Tantalum; D014025:Titanium; D016474:Weight-Bearing; D015032:Zinc
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D009556:Niobium; C031462:titanium alloy (TiAl6V4); D013635:Tantalum; D014025:Titanium; D007501:Iron; D015032:Zinc; D010100:Oxygen; D012825:Silicon
keywords: Ductility; Elastic modulus; Orthopaedic implants; Strengthening mechanisms; Ultrasound spectroscopy; β-Ti alloys