DEVELOPMENT AND CHARACTERIZATION OF A NEW METASTABLE BETA TITANIUM Ti-26Nb-3Mo-6Zr ALLOY FOR ORTHOPEDIC APPLICATIONS

Referencia Apresentador Autores
(Instituição)
Resumo
IIIa09-018
Thaísa Dragon Leal Leal, T.D.(Universidade do Estado do Rio de Janeiro); Borborema, S.(UERJ); Cossu, C.M.(Universidade de São Paulo); Nunes, A.R.(UFRJ); de Almeida, L.H.(UFRJ); Nunes, C.A.(Universidade de São Paulo); For the development of titanium alloys, it is important to have in their composition non-toxic and non-allergenic elements with Young’s moduli closer to that of the bone to avoid stress shielding. Therefore, this work presents the relationship between cold deformation on the microstructure of ? metastable Ti-26Nb-3Mo-6Zr alloy, as well as the influence of the degree of cold rolling on Young's modulus, after homogenization and annealing heat treatments. The ingots were produced by arc melting under high purity argon atmosphere and were solution treated at 1000 ºC under high vacuum for 24 h, followed by quenching in water at room temperature. The samples were cold rolled to reduce its thickness up to 90% deformation. The microstructural evolution was characterized by optical microscopy and X-ray diffraction, whereas the mechanical properties were investigated through Young’s modulus measurements obtained by ultrasonic method and microhardness. The Ti-26Nb-3Mo-6Zr alloy presents equiaxed ? grains after solution heat treatment and the grains have been elongated gradually with increasing deformation, inducing the precipitation of ?” martensite. The hardness of the samples increased with the degree of deformation, while elastic modulus decreased. The cold rolled ? Ti-26Nb-3Mo-6Zr alloy at 90% maximized hardness/Young's modulus ratio, being a potential candidate to use as orthopedic implants.
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