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Ti-6Al-7Nb Alloy (ti-6al-7nb + alloy)
Selected AbstractsThe electrochemical behavior of Ti-6Al-7Nb alloy with and without plasma-sprayed hydroxyapatite coating in Hank's solutionJOURNAL OF BIOMEDICAL MATERIALS RESEARCH, Issue 5 2002I. C. Lavos-Valereto Abstract The electrochemical behavior of Ti-6Al-7Nb alloy with and without plasma-sprayed hydroxyapatite (HA) coating was investigated in Hank's balanced salt solution at 37 °C. This behavior was evaluated by analyzing both corrosion potential variation with time curves and potentiodynamic polarization curves. The polarization curves were determined both in aerated and deaerated solutions. It was found that the corrosion potential of uncoated sample is always more noble than that of coated one. In aerated solutions the polarization curve of a coating-free alloy presents a typical passive/transpassive behavior, which is absent in the HA-coated alloy and in deaerated solution for both coated and uncoated conditions. In the latter polarization curves, the current density continuously increases with the increase of the potential. The corrosion rate determined from polarization curves is higher for HA-coated alloys, but it still can be considered negligible (less than 1 ,A/cm2). © 2002 Wiley Periodicals, Inc. J Biomed Mater Res (Appl Biomater) 63: 664,670, 2002 [source] Influence of microstructural changes on corrosion behaviour of thermally aged Ti-6Al-7Nb alloyMATERIALS AND CORROSION/WERKSTOFFE UND KORROSION, Issue 5 2004L. Thair Abstract Solution treatment and ageing (STA) is an effective strengthening method for , + , titanium alloys. This paper reports the effect of solution treatment and aging on the corrosion behaviour of Ti-6Al-7Nb alloy in a simulated body fluid (Ringer's solution). Ti-6Al-7Nb alloy is hot rolled in the , + , field and subjected to solution treatment above and below its beta transus temperature (1283 K). The solution treated specimens are water quenched (WQ), air-cooled (AC), and furnace cooled (FC) at three different rates, and subsequently aged at 823 K for 4 h. Microstructural changes were examined using optical microscopy and phases developed were analyzed using XRD. The influence of microstructure on the corrosion performance of the alloys are discussed in detail based on the Open Circuit Potential (OCP), passive current density and area of repassivation loop values obtained from the cyclic polarization study in Ringer's solution. The passive current density was low (0.5 ,A/cm2) for the specimen with duplex microstructure obtained for specimen solution treated at 1223 K, air-cooled, and aged, in comparison with that for as-rolled specimen (1.5 ,A/cm2). The corrosion aspects resulting from various heat treatments are discussed in detail. [source] | ||||||||||