Silicon distribution and silicide precipitation during annealing in an advanced multi-phase γ-TiAl based alloy

Intermetallic TiAl alloys solidifying via the disordered β phase, such as the TNM alloy, are promising γ-TiAl based materials as balanced mechanical properties are attained by conventional manufacturing routes and subsequent heat-treatments. However, a further enhancement of creep resistance is required to exceed present service temperature limitations. In this regard, alloying with light elements, such as C and Si, is of particular interest. Underlying strengthening mechanisms are well established in case of C, but matter of debate in case of Si.