Deformability and microstructure transformation of pilot ingot of Ti–45Al–(8–9)Nb–(W,B,Y) alloy

Thermo-mechanical processing parameters of Ti–45Al–(8–9)Nb–(W,B,Y) alloy were investigated by hot simulation tests. From the results, pilot ingots were forged, and the microstructures of the ingots before and after forging were analyzed by optical microscopy and scanning electron microscopy (SEM). The results showed that the alloy exhibited good deformability and low deformation resistance at higher temperature and lower strain rate. Crack-free pancakes were obtained by jacketed forging up to 75% engineering strain for the pilot ingots with a height-to-diameter (H/D) ratio ranging from 1.10 to 2.13. The as-forged microstructure consisted of the refined duplex microstructure for the majority of the forged sample with partially recrystallized zone near the surface.