EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

Nowadays, the use of near-α titanium alloys in aircraft engines is limited to low pressure compressor part, since above 600°C, the mechanical properties of the conventional near-α titanium alloys are drastically reduced. For the past 20 years numerous research works have been carried out to find suitable strengthening method to improve near-α titanium alloys properties for temperatures up to 650°C, or even higher. Alloying is one of the fundamental methods to improve the high temperature mechanical properties of titanium alloys. Hence, the general aim of our work is to revisit the composition of common industrial near-α titanium alloys such as Ti 6Al-2Sn-4Zr-2Mo-0.1Si by means of high throughput thermodynamics and kinetics calculations. The purpose of the present study is to discuss the impact of some alloying elements (Al, Sn, Zr, Mo, Nb, Si…) on the microstructures and on the tensile properties both at room and high temperature. Arc melted 350 g buttons were produced, hot rolled then solution-treated in the β-phase field of the alloy with a quenching in air at room temperature followed by an aging treatment. The effect of alloying and additional aging time on microstructures were investigated using Scanning Electron Microscope (SEM) and phase fraction analysis was performed using the ImageJ software.