Α alloy contains a certain amount of stable α phase elements, balanced state mainly by the α phase composition. Α alloy with small specific gravity, good thermal strength, with good weldability and excellent corrosion resistance, the disadvantage is low room temperature, usually used as heat-resistant materials and corrosion-resistant materials. (Ti-8Al-1Mo-1V) and α-alloys (Ti-2.5Cu) with small amounts of compounds are usually divided into all-α alloy (TA7), near-α alloy (Ti-8Al-1Mo-1V)