Sintering behaviour and mechanical characterisation of Ti64/xTiN composites and bilayer components

Abstract

Ceramic particle reinforcement can be used to improve the surface properties of Ti6Al4V (Ti64) alloy. Powder metallurgy route is a promising method to fabricate such reinforced Ti64 components. To assess the relevance of this technique, this work investigates the effect generated by the addition of TiN particles in Ti64 powder during free sintering. TiN reinforcement particles were randomly distributed in the Ti64 matrix with three different concentrations in two configurations: completely reinforced and unreinforced-reinforced bilayer. Dilatometry was used to obtain the shrinkage kinetics of samples at 1200, 1300 and 1400°C under inert atmosphere and to investigate the impact of reinforced particles on the sintering behaviour. The microstructure of sintered materials was shown to be lamellar in the unreinforced material and equiaxed in reinforced materials. Finally, the Vickers microhardness measurement showed the huge benefit of adding TiN particles to increase the mechanical strength of the Ti64 alloy.

Direct-ink writing of strong and biocompatible titanium scaffolds with bimodal interconnected porosity

“…In this study a sintering temperature of 1200 ∘ C was used as the purpose is to keep a microporous network thanks to partial sintering. Indeed, Chávez et al showed that using a sintering temperature of 1200 ∘ C led to around 11 % of porosity in Ti64 samples with particle shape and size similar to the ones used here [70]. Figure 6 shows the scaffold aspect at each processing step (dried, debinded, sintered).…”

Influence of Beam Power on Young’s Modulus and Friction Coefficient of Ti–Ta Alloys Formed by Electron-Beam Surface Alloying

“…Titanium and its alloys are commonly used in the field of modern biomedicine and for the manufacturing of implants due to their biocompatibility, superior corrosion resistance, and static and fatigue strength [1][2][3]. However, some health problems related to the release of metallic ions exist, which could lead to adverse reactions and implant failure [4].…”

Analysis of thermo-elastic and physical properties of recycled 2017 Aluminium Alloy/Gp composites: thermal management application

“…For instance, it is evident from the figure 5(b) that the porosity value after sintering at 550°C is only 16.4%, compared to 19% obtained after 450°C. This conclusion is justified by the diffusion phenomenon which is thermally activated according to many authors [4,39,40,42,43]. In this regard, they explained that the best particle bonding is taking place at a high temperature, and consequently, the pore reduction has a direct relationship with the sintering process.…”