Effect of gold addition on the microstructure, mechanical properties and corrosion behavior of Ti alloys

Abstract

We performed a systematic investigation of the 10,15,20, and 40 wt%) alloys to assess the effect of addition of element Au on the microstructure, mechanical properties, and corrosion behavior of commercially pure titanium (cp-Ti). The phase and microstructure were characterized using X-ray diffraction (XRD), optical microscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicated that the Ti-xAu alloys containing up to 15 wt% Au showed a hexagonal close-packed α-Ti structure, whereas the Ti-xAu alloys containing more than 20 wt% Au were mainly composed of the α-Ti phase and Ti 3 Au intermetallic phase. We also investigated the effect of alloying element Au on the mechanical properties (including Vickers hardness and modulus) and corrosion behavior of Ti-xAu binary alloys. The addition of gold to Ti improved its hardness. Electrochemical results showed that the Ti-xAu alloys exhibited improved corrosion resistance than cp-Ti.

On the Corrosion Behaviour of Low Modulus Titanium Alloys for Medical Implant Applications: A Review

“…Therefore, TNTZ seems to act better in orthopaedic applications [68]. Many authors have delved deeply in the electrochemical properties of low modulus Ti alloys including beta phase [71][72][73][74][75][76][77]. The Ti passive layer acts as a protective layer in various aqueous environments and its reaction in H 2 O is as follows:…”

Thermal activation of Ti(1-x)Au(x) thin films with enhanced hardness and biocompatibility

“…Lee et al explored the mechanical properties of arc melted Ti–Au alloys in the Au concentration range of 0–40 at % and found hardness to increase from ∼4 to ∼5 GPa with increase in Au doping. However in this study, the presence of a super hard β-phase of Ti 3 Au was not detected [ 36 ]. In a similar work by Oh et al, Ti–Au alloys were tested for their cytotoxicity profile and their potential biomedical application in a smaller Au concentration range of 0–21 at %.…”

“…The alloy systems undergo structural changes when heat treated at elevated temperature and the β-phase of Ti 3 Au was reported to emerge at temperatures higher than 400 °C. Precipitation of finely dispersed β-phase from the supersaturated α-phase can occur at high temperature leading to formation of pinning sites, which will lead to precipitation hardening of the as-grown α-phase of Ti 3 Au thin films [ 36 ]. Thermal energy can be introduced to a thin film either in-situ while the film is growing in the deposition chamber, or ex-situ via post-deposition heat treatment.…”

Stress Evaluation of Titanium-gold and Titanium-aluminum-vanadium Alloy for Orthodontic Implants: A Comparative Finite Element Model Study

“…Lee et al measured the effect of gold addition on the corrosion behavior of Ti alloys and reported that the Ti-Au alloys exhibited improved corrosion resistance than commercially pure Ti. [3] Rosalbino et al correlated the positive influence of Au on the corrosion resistance of Ti. [4] Oh et al studied the cytocompatibility and electrochemical properties of Ti-Au alloy and reported that the cytotoxicities of the alloy were similar to that of pure Ti.…”