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

Abstract

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 γ+α2 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 °C and 1×10−4 s−1. The deformation mechanism is mainly referred to the motion and rotation of γ+α2 areas and dynamic recrystallization. The γ+α2 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 γ, α2 phase, and twins in γ phases, are the deformation mechanism in alloys.