| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Composition–Processing–Microstructure-Property Relationships of Titanium Alloys
|
| Presentation Title |
Influence of Zr and O on the Evolution of Microstructural Features in High γ-Phase Ti-Al-Zr Alloys |
| Author(s) |
Michal Kuriš, Mária Tsoutsouva, Marc Thomas, Agnés Bachelier Locq, Zhao Huvelin, Thomas Vaubois, Pierre Sallot |
| On-Site Speaker (Planned) |
Michal Kuriš |
| Abstract Scope |
TiAl-based alloys are high resistance above 700°C, low density, specific strength and resistance to oxidation but suffer from limited ductility and fracture toughness. The aim of this work is to gain a deeper understanding of the effect of Zr to modify the solidification microstructure with the lowest possible α2 phase content and thus a nearly fully γ-TiAl alloy. We intend to compare model alloys with high and low oxygen level. The model alloys Ti48Al, Ti52Al, Ti52Al0.5Zr, Ti52Al1Zr and Ti52Al2Zr are prepared in the form of ingots and heat treated at 1120°C (Ti48Al), 1250°C (Ti52Al) and 1300°C (Ti52Al0.5Zr, Ti52Al1Zr, Ti52Al2Zr) for analyse the process of formation α2 and γ phases. Thermodynamic calculations are performed using ThermoCalc to the optimize chemical composition and the heat treatment conditions of the alloys, considering the effect of oxygen content. The accuracy of the simulation is examined by extensive chemical, structural and microstructural characterisations. |