Abstract
Intermetallic titanium aluminide alloys, based on the ordered γ-TiAl phase, were recently introduced into civilian aero engines as a structural blade material. Nevertheless, their attractive property profile, light-weight combined with high-temperature strength has room for improvements, as for example, their room-temperature ductility remains low.
Advanced Gamma-TiAl alloys with nano-scale modulated microstructures show significantly enhanced ductility behaviour. The microstructural modulation consists of several phases and at least one orthorhombic phase. Using in situ highenergy X-ray diffraction experiments we studied orthorhombic phase formation and have elucidated the formation path and the crystallographic structure of the phase that is formed.
