A high-strength dual-scale structure titanium alloy, a preparation method therefor, and an application thereof, belonging to the technical field of alloy processing. The composition system of the titanium alloy is Ti-Nb-Cu-Co-Al, the atomic percentage of the various elements being 58~70% Ti, 9~16% Nb, 4~9% Cu, 4~9% Co, and 2-8% Al. The microstructure comprises a dual-scale coexistence of micro-crystal isometric bcc β-Ti and ultra-fine crystal isometric bcc β-Ti, and a dual-scale coexistence of micro-crystal strip fcc CoTi2 and ultra-fine crystal isometric fcc CoTi2, or an ultra-fine crystal strip fcc CoTi2 twin crystal is distributed along a boundary of a dual-scale substrate, the dual-scale substrate being a nano needle-shaped martensite a' phase dispersed within micro-crystal bcc β-Ti. The mechanical properties of the titanium alloy are significantly improved, and the titanium alloy may be used in fields such as aerospace and aviation, weaponry and sports equipment.
展开▼
