Abstract
Effects of alloying elements (i.e., variable content of Mo and C) on the microstructure and mechanical properties of five types of experimental material based on TiAl alloy containing 7at.% Nb were investigated. Mechanical properties (tensile, compression and fatigue) at room and at elevated temperatures were evaluated. Addition of Mo and/or C resulted in different phase compositions and three typical microstructures. To judge the effect of alloying on the microstructure the comparison with reference TiAl alloy with 7at.% Nb without C and Mo addition was used. Evaluation of mechanical properties of individual alloys revealed two most promising variants: (i) alloy with 2at.% Mo containing β phase, having mixed microstructure and exhibiting the highest ductility, (ii) alloy with 0.5at.% C having nearly lamellar microstructure, enhanced amount of α2 phase, without β phase and exhibiting the highest strength. No positive effect of combined Mo and C addition on mechanical properties was identified. Fractographic observations revealed that the major fracture mode in all alloys was trans-lamellar. Inter-lamellar fracture was observed occasionally and mainly in C containing alloys.
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