Thermomechanical response of particulate-reinforced powder metallurgy titanium matrix composites-A study using processing map

摘要

Thermomechanical response of the Ti-1.5Fe-2.25Mo-0.6Y (wt.%) alloy strengthened by 10% Mo_2C and produced by a powder metallurgy route was studied with hot-compression process. Detailed analysis of the deformation behavior combined with microstructure observation was carried out to characterize the deformation mechanisms of the materials under various conditions. The results indicate that processing map based on the dynamic materials model can accurately describe the deformation behavior and correctly predict the optimum hot forging condition for the current material. The microstructure observations reveal that flow softening of the titanium matrix is closely related to dynamic recovery followed by a continuous dynamic recrystallization process. It is also observed that during the hot forging process, the reinforcements play important roles not only in improving the mechanical properties and refining the matrix but also in inducing the plastic instability.