Hot deformation behavior and microstructural evolution of titanium-aluminum based alloy during hot compression

In this paper, titanium-aluminum based alloy was successfully prepared by introducing titanium powders using powder metallurgy. The experimental results indicated that the microstructures of alloys were composed of the new trititanium-aluminium layers skeleton and the gamma+alpha 2 phases filler, which exhibited excellent compression properties. The compressive strength of the titanium-aluminum based alloy (10 wt.% titanium) were 509.9 MPa, higher than monolithic Ti-48Al-2Cr-2Nb alloy at 800 degrees C and 1x10-4 s-1. The deformation mechanism is mainly referred to the motion and rotation of gamma+alpha 2 areas and dynamic recrystallization. The gamma+alpha 2 areas were surrounded by complete new trititanium-aluminium layers, which is beneficial to dislocation pile-up, cross and tangle at grain boundaries, resulting in high strength. Besides, the dislocation pile of gamma, alpha 2 phase, and twins in gamma phases, are the deformation mechanism in alloys. In this paper, a novel titanium-aluminum based alloy was successfully prepared using powder metallurgy method by introducing titanium powders. The influences of titanium powder content on microstructure, high-temperature properties and the deformation mechanisms of the titanium-aluminum based alloy were investigated and discussed using scanning electron microscopy and transmission electron microscopy technology. image