from the conferences organized by TANGER Ltd.
The microstructural stability of fully lamellar γ-TiAl alloy was studied under thermal exposure at 750, 850 and 950 °C for 3400 h. The microstructure analysis shows that the most dominant change in the microstructure was that the α2 lamellae thinned gradually and thinning was more pronounced with increasing temperature and with increasing time. Formation of recrystallized γ grains and Ti2AlC carbides were also observed especially during the temperature 850 and 950 °C after prolonged heat treatment. The effect of microstructural changes during the thermal exposure on mechanical properties was evaluated and discussed.
Keywords: Titanium aluminides, thermal stability, microstructure, carbides© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.