Microstructure and Properties of Magnesium Alloy for Titanium-containing Mechanical Shell Forged at High Strain Rate

High strain rate forging tests for AZ80 Ti titanium-containing mechanical shell magnesium alloy specimens were carried out,and the microstructure and mechanical properties were compared and analyzed.The results show that the content of titanium,forging temperature and strain rate have important effects on the microstructures and mechanical properties of the specimens.With the increase of titanium content from 0.4% to 1.2% and strain rate from 50 s^-1 to 125 s^-1,the average grain size of the sample decreases first and then remains basically unchanged,while the mechanical properties of the sample increase first and then remain basically unchanged.With the forging temperature increasing from 300 ℃ to 340 ℃,the average grain size of the sample decreases first and then increases,and the mechanical properties increase first and then decrease.Compared with the sample with 0.4% titanium content,the tensile strength and yield strength of the specimens with 0.8% titanium increase by 31 MPa and 29 MPa,respectively.Compared with the sample with forging temperature of 300 ℃,the tensile strength and yield strength of the specimens forged at 320 ℃ increase by 38 MPa and 39 MPa,respectively.Compared with the sample with strain rate of 50 s^-1,the tensile strength and yield strength of the specimens respectively increase by 19 MPa and 21 MPa at 100 s^-1 of strain rate.