Degradation behavior of Ti-Nb alloys: Corrosion behavior through 21 days of immersion and tribocorrosion behavior against alumina

Abstract

Non-toxic and allergic free β-type Ti alloys are attractive metallic implant materials due to their lower Young's modulus and good biocompatibility, but the corrosion and tribocorrosion behavior are yet to be fully understood. In this study, corrosion behavior of Ti-15Nb and Ti-40Nb alloys was investigated and compared with the commercial Ti-6Al-4V alloy through an immersion period of 21 days. The tribocorrosion behavior was investigated under open-circuit potential by using a ball-on-plate tribometer. Results suggested that the β-type Ti-40Nb alloy having 51 GPa Young's modulus had lower corrosion and wear resistance as compared to the α + βtype Ti-15Nb and Ti-6Al-4V alloys.

Interactions between wear and corrosion on cast and sintered Ti-12Nb alloy in comparison with the commercial Ti-6Al-4V alloy

“…Several studies showed that Ti-6Al-4 V presents better wear resistance than the α + β Ti-15Nb [15], near β Ti-13Nb-13Zr [16], β Ti-12Mo-6 Zr-2Fe [17], and β Ti-29Nb-13Ta-4.6 Zr [18] mainly due to its higher hardness resulting from its microstructure. Under OCP conditions, the Ti-6Al-4 V alloy presented lower wear volume loss that may be linked to its higher hardness values compared to the Ti-12Nb alloys.…”

“…The ingots were re-melted several times then heat treated at 1000°C for 24 h in an ultra-vacuum furnace for homogenization. Afterwards, the ingot was submitted to a hot-rolling treatment carried out at 900°C and, finally, another heat treatment at 1000°C for 24 h in a vacuum to relieve the residual stress during the machining procedure (complete details of the processing are given elsewhere [15]). In the case of the alloy produced by P/M, TiH 2 and Nb powders were homogenized by mixing for 1 h in a Turbula® multidirectional mixer.…”

“…Although vanadium-free Ti-6Al-7Nb alloy was developed for biomedical applications, especially for hip prothesis [13], this alloy has still higher Young's modulus (110 GPa) [13] and still include Al, that is suspected to be associated with Alzheimer's disease [1,14]. Recently, several studies reported lower wear resistance for low Young's modulus and non-toxic β type Ti alloys tested in 9 g/l NaCl solution [15], Ringer's solution [16], simulated body solution [17], and under dry sliding condition [18], mainly due to the low strain hardening behavior of the β phase. Further understanding is needed on the tribocorrosion behavior of non-toxic and low Young's modulus Ti alloys being developed as an alternative to Ti-6Al-4 V for load-bearing implant applications.…”

Surface Properties and Mechanical Performance of Ti-Based Dental Materials: Comparative Effect of Valve Alloying Elements and Structural Defects

“…The electrical circuit selected in this study is commonly used to designate the EIS parameters for Ti-based materials in physiological solutions. [27,70] For all of the fitting data, v 2 values were less than 0.05. Designated values of CPE parameter (Y p ) were in the range of 10 À5 X À1 cm À2 s n , which is a typical for passive layers formed on Ti and its alloys tested in the biomedical solutions.…”

Effect of Potential and Microstructure on the Tribocorrosion Behaviour of Beta and Near Beta Ti Alloys II

“…An alumina ball (Oakwase Ltd., UK) was chosen as an inert counterface. This tribosystem does not represent a specific implant application, but rather serves as a baseline system for a comparative assessment of the tribocorrosion properties of the four chosen titanium alloys and for further comparison with other previously published work [22][23][24]. The test were performed at 37 °C in a simulated joint fluid consisting of new-born calf serum with a protein concentration of 15.5 g/L (First Link (UK) Ltd.…”