TY - GEN A1 - Kathöfer, Fabian A1 - Pyczak, Florian T1 - Effect of ternary elements on the eutectic temperature and microstructure in TiAl-x (x=Nb,Cr,Zr), MSE, Darmstadt, 2018 N2 - Titanium aluminides alloys (TiAl) based on the intermetallic γ-phase are widely recognized for their potential as aero engine components. This is due to their comparable service temperature and lower density than conventional metallic systems as for example Ni-base superalloys. For this reason, TiAl alloys are recently used in aircraft turbines as material for turbine blades. However, on the alloying development side almost exclusively the processing of cast or forged parts is state of art. Also, the forming of these alloys is still challenging and expensive, since the necessary forming temperatures between 1100 °C and 1250 °C bring currently available die materials to their limits. The present research is focused on the modification of TiAl-X (X being a ternary alloying element) alloy compositions to create a phase constitution that allows isothermal forming at lower temperatures. The underlying idea is to stabilize the unordered α-phase in the temperature regime between 1000 - 1100°C. It is expected that this unordered α-phase can be deformed more easily than ordered phases α2 and γ normally present in TiAl alloys. Based on the work of Kainuma et. al.[1] and thermodynamic calculations using Thermo-Calc software, different alloy composition - Ti – (38-43)Al – (1-7,5)[Nb,Cr,Zr] - were identified as promising for this concept. Therefore, samples were produced by arc melting and analyzed with respect to their phase transition temperature, microstructure and phase constitution. The results were compared to measurements done with the commercial used TiAl alloy TNM (Ti – 43, 5Al – 4Nb – 1Mo – 0,1B). [1] Kainuma, R, Fujita, Y. Mitsui, H., Ohnuma, I. and Ishida, K. (2000) Intermetallics, 8 KW - Titanium Aluminides KW - Material alloying KW - Phase Transformation KW - Microstructure Y1 - 2018 UR - https://www.mse-congress.de/program/poster-session SP - 1 ER -