Diffusion and Control of Ti/Al Interface in Preparation of Ti/Al Alloy by Cold Rolling

The Al/Ti/Al sheet was prepared by cold rolling and it was annealed under different processes.The morphology of the Ti/Al interface before and after annealing was observed with a scanning electron microscope.The microhardness of the titanium layer was measured with a microhardness,and the growth rule of the Ti/Al interface during the annealing and rolling process was explored.The rules of interfacial growth show that the thickness of diffusion layer increases exponentially with the increase of annealing temperature.When the annealing time is less than 45 min,the thickness of the diffusion layer is not sensitive to the time.However,with the annealing time more than 45 min,the thickness of the diffusion layer increases sharply with the time.The microhardness results show that the rolled sheet could be basically annealed at 580 ℃ for 30 min.At the rolling reduction of 5% and annealing temperature of 580 ℃ for 30 min,the interface diffusion layer can be deformed with the rolling process with the thickness controlled at about 0.8 μm.