Study on Microstructure and Properties of Titanium Alloy for Building by Electromagnetic Pulse Forming

The electromagnetic pulse forming test of Ti-6Al-4V-0.5Cr,a new titanium alloy for building,was carried out at different processing parameters,and the microstructure and mechanical properties of the alloy were tested and analyzed.The results show that the experimental alloys with better properties can be obtained by electromagnetic pulse forming.The tensile strength,yield strength and elongation after fracture can reach 962 MPa,891 MPa and 14.5% respectively.With the discharge voltage increasing from 10 kV to 20 kV or coil spacing increasing from 4 mm to 10 mm,the structure of the tested alloy is refined first and then coarsened,and the mechanical properties are improved first and then decreased.Compared with the low discharge voltage of 10 kV,the tensile strength and yield strength of the tested alloy respectively increase by 14 MPa,11 MPa and the elongation after breaking decreases by 1.2% when the discharge voltage of 15 kV is used.Compared with the coil spacing of 4 mm,the tensile strength and yield strength of the tested alloy respectively increase by 11 MPa,9 MPa and the elongation after breaking decreases by 0.8% when the coil spacing is 7 mm.