SciELO - Scientific Electronic Library Online

 
vol.15 issue6Corrosion behaviour of Al/SiC and Al/Al2O3 nanocompositesStudy on microstructures and work hardening behavior of ferrite-martensite dual-phase steels with high-content martensite author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Materials Research

Print version ISSN 1516-1439

Abstract

FLORENCIO, Odila et al. Dynamical Elastic Moduli of the Ti-13Nb-13Zr biomaterial alloy by mechanical spectroscopy. Mat. Res. [online]. 2012, vol.15, n.6, pp. 911-914.  Epub Sep 04, 2012. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392012005000109.

Dynamical Elastic Moduli of the Ti-13Nb-13Zr biomaterial alloy were obtained using the mechanical spectroscopy technique. The sample with heat treatment at 1170K for 30 minutes and water quenched with subsequent aging treatment at 670 K for 3 hours (TNZ + WQ + 670 K/3 h), was characterized through decay of free oscillations of the sample in the flexural vibration mode. The spectra of anelastic relaxation (internal friction and frequency) in the temperature range from 300 K to 625 K not revealed the presence of relaxation process. As shown in the literature, the hcp structure usually does not exhibit any relaxation due to the symmetry of the sites in the crystalline lattice, but if there is some relaxation, this only occurs in special cases such as low concentration of zirconium or saturation of the stoichiometric ratio of oxygen for zirconium. Dynamical elastic modulus obtained for TNZ + WQ + 670 K/3 h alloy was 87 GPa at room temperature, which is higher than the value for Ti-13Nb-13Zr alloy (64 GPa) of the literature. This increment may be related to the change of the proportion of α and β phases. Besides that, the presence of precipitates in the alloy after aging treatment hardens the material and reduces its ductility.

Keywords : Ti-13Nb-13Zr; aging treatment; elastic modulus; anelastic relaxation.

        · text in English     · pdf in English