Low-temperature 1800MPa-grade ultrahigh-strength pure titanium as well as preparation method and application thereof

The invention discloses low-temperature 1800 MPa grade ultrahigh-strength pure titanium and a preparation method and application thereof.The preparation method comprises the steps of room-temperature forging, low-temperature surface shot blasting, low-temperature forging, alternate low-temperature surface shot blasting treatment and low-temperature forging, the microstructure of the ultrahigh-strength pure titanium is nanometer isometric crystals, and the grain size is 20-80 nm; the tensile strength of the ultrahigh-strength pure titanium at the liquid nitrogen temperature is larger than or equal to 1800 MPa, and the tensile strength at the room temperature is larger than or equal to 1200 MPa. The ultrahigh-strength pure titanium bar or wire is obtained through the simple and mature process, the finished titanium bar or wire is higher in surface hardness and has better wear resistance and expected fatigue durability, and the technical process has the advantages of being low in energy consumption, high in effi