Influence of heat treatment on microstructure and mechanical properties of Ti-1300 alloy

The mechanical properties and microstructures of Ti-1300 titanium alloy rod with diameter of 160 mm after solution plus aging treatment andβannealing plus aging treatment were investigated.The results show that good ductility and toughness could be achieved for Ti-1300 rod at high strength level after heat treatment.The alloy also presents deep quenching characteristics.After solution plus aging treatment,such mechanical properties(ultimate tensile strength no less than 1 250 MPa,elongation no less than 8%) could be achieved.Afterβannealing plus aging treatment,the strength is relatively low;however,the toughness is improved and there is no obvious difference of properties between longitudinal and transverse directions.By adjusting the parameters of heat treatment,the ultimate tensile strength, elongation and fracture toughness no less than 1 100 MPa,8%and 70 MPa·m~(1/2),respectively,could be achieved.