Five-element system damage tolerance medium-strength titanium alloy

The invention discloses a five-element system damage tolerance medium-strength titanium alloy. The five-element system damage tolerance medium-strength titanium alloy comprises the following components by mass percentage: 5.6%-6.9% of Al, 2.5%-3.5% of Zr, 2.5%-3.5% of Mo, 2.5%-3.5% of Nb, and the balance being titanium and inevitable impurities. By designing the components and content in the titanium alloy, the room temperature and high temperature strength and plastic property of the titanium alloy are improved, and the high temperature oxidation resistance and acid and salt corrosion resistance of the titanium alloy are enhanced. The titanium alloy has better overall performances than other damage tolerance titanium alloys, and does not contain a V element harmful to human bodies, and therefore, the use safety of the five-element system damage tolerance medium-strength titanium alloy is improved; and the five-element system damage tolerance medium-strength titanium alloy is widely used in the field of elect