The invention discloses a high-
toughness titanium alloy. The high-
toughness titanium alloy comprises the following chemical components of, in percentage by
mass, 4.0%-6.0% of Al, 1.0%-3.0% of Mo, 1.0%-3.0% of Zr, 0.5%-1.0% of Fe, 0.2%-0.5% of V and the balance Ti and inevitable impurities. The method for preparing the bar by using the high-
toughness titanium alloy comprises the following steps that aluminum titanium,
molybdenum titanium, iron nails, titanium-
vanadium intermediate alloy, pure
zirconium sponge and titanium
sponge are correspondingly weighed, mixed and pressed into an
electrode bar, and the
electrode bar is smelted in a vacuum consumable electro-arc furnace for two times to obtain a
titanium alloy cast
ingot; the surface of the
titanium alloy cast
ingot is coated with a puretitanium plate with the thickness of 1.0-2.0 mm, an anti-oxidation
coating is brushed on the surface of the pure
titanium plate, and the
titanium alloy cast
ingot is aired for later use; the titaniumalloy cast ingot is placed in a
heating furnace to be heated to 930-1150 DEG C, and heat preservation is conducted; and the ingot heated by a
radial forging machine is forged to obtain a
forging blank; and the
forging blank is straightened by using a press
machine by using
waste heat, and finally
machining is conducted to obtain the bar. According to the high-toughness titanium alloy and the method for preparing the bar by using the titanium alloy, the bar prepared from the titanium alloy is high in strength, high in
plasticity, high in low-temperature
impact toughness and good in
corrosion resistance, and the application requirements of severe working conditions of oil and gas wells are met.