Method for improving strength of titanium alloy and reducing elastic modulus at same time

The invention discloses a method for improving the strength of titanium alloy and reducing the elastic modulus at the same time, and belongs to the field of heat treatment processing of titanium alloy materials. The method comprises the following steps: preparing an intermediate alloy Ti-Cu alloy in advance; mixing niobium particles, zirconium particles and the intermediate alloy, wherein the metal Nb is added according to 35wt%; the metal Zr is added according to 7wt%; the metal Cu is added according to 10wt%; ti is the balance; the adding error of the alloy is smaller than 1wt.%, smelting is carried out in a vacuum non-consumable electric arc furnace, and overturning is carried out for 4-5 times; obtaining a finished titanium alloy ingot; the obtained finished titanium alloy ingot is put into a vacuum tube furnace, the heat treatment temperature is T beta + (10-200 DEG C), the heating speed in the heat treatment process is 10-20 DEG C/min, and the heat preservation time is 90-120 min; the obtained beta tita