Thermomechanical characterization of P/M Ti–Fe–Mo–Y alloy with a fine lamellar microstructure

Thermomechanical response of a newly designed α + β type Ti–1.5Fe–2.25Mo–0.6Y (wt.%) alloy produced by elemental powder metallurgy (P/M) route was studied using hot compression process. Detailed analyses of the deformation behavior combined with a microstructure observation were carried out to characterize the deformation mechanisms under various conditions. The results indicate that the flow softening of the present alloy is a continuous dynamic-recrystallization (DRX) process. At a given strain, the proportion of low angle grain boundaries (LAGBs) shows a close affinity to the Zener–Hollomon parameter (Z) and the relation can be expressed as LAGBs% = (−10.2 ± 5) + 4 log Z, which well describes the relation between the deformed microstructure and deformation parameters. The P/M Ti–1.5Fe–2.25Mo–0.6Y alloy is found to possess good workability, based on the compression experiments and the processing map. The good deformation ability is believed to be attributed to the initial fine microstructure derived from the P/M route.