Effect of aging temperature on microstructure and mechanical properties of the TB18 titanium alloy was investigated by means of tensile testing machine,optical microscope and scanning electron microscope.The results indicate that with the aging temperature increasing,the tensile strength and yield strength decrease,while the elongation and the percentage reduction of area increase.Considering both the strength and plasticity,the best comprehensive mechanical properties of the alloy are achieved when aged at 530 ℃,where the tensile strength is 1285.5 MPa,the yield strength is 1206 MPa,the elongation is 7.8％,and the percentage reduction of area is 16％.The microstructure of forged TB18 titanium alloy is a typical equiaxed structure.After solution treatment at 870 ℃ for 2 h and then air cooling,the microstructure is consist of β grains with the size of 200-250 μm.After aging at different temperatures,the micro morphologies of the secondary α phases are similar,all with layered characteristics.With the increase of aging temperature,the size of secondary α phase lamella in the alloy showing an increasing tendency.
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