Hot deformation behavior and microstructural evolution of titanium-aluminum based alloy during hot compression Warmverformungsverhalten and gefügetechnische Entwicklung von Titan-Aluminium-Legierungen bei der Warmverdichtung

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.