Microstructure and mechanical properties of low and heavy alloyed γ-TiAl + α2-Ti3Al based alloys subjected to different treatments

The microstructure and mechanical properties of the cast Ti–43.7Al–3.2(Nb,Cr,Mo)–0.2B alloy and a Ti–45Al–8Nb–0.2C alloy after hot extrusion followed by heat treatment were studied in the present work. The hot-worked alloy showed appreciably higher strength/ductility properties at room temperature as compared with those of the cast alloy. The difference in the mechanical properties gradually decreased with increasing the test temperature. At 750 °C similar strength/ductility properties as well as long-term strength were obtained for both alloys.

► Two gamma-TiAl alloys with respect to certain processing routes were investigated.
► Microstructure and mechanical properties two gamma-TiAl alloys were studied.
► Heavy alloying and hot working led to better tensile mechanical properties.
► Similar mechanical properties were obtained in the alloys at high temperatures.