Titanium alloys are divided into three categories: α alloy, (α + β) alloy and β alloy.
1. α titanium alloy
It is a single phase alloy composed of α phase solid solvent. No matter at general temperature or at high practical application temperature, it is α phase, with stable tissue. It’s wear resistance is higher than pure titanium, and has strong oxidation resistance. The intensity and creep resistance are still maintained at temperatures ranging from 500℃ to 600℃, but the heat treatment reinforcement cannot be performed, and its intensity is not high at room temperature.
2. β titanium alloy
It is a single-phase alloy composed of β phase solid solvent, with high strength without heat treatment, quenching and aging alloy after further reinforcement, room temperature strength can reach 1372~1666 MPa; but the thermal stability is poor, should not be used at high temperature.
3. α + β titanium alloy
It is a duplex alloy, with good comprehensive performance, good tissue stability, good toughness, plasticity and high temperature deformation performance, It can be better thermal pressure processing. Quenching, aging can strengthen the alloy. Its strength after heat treatment is about 50%~100% higher than the annealing state; the strength It can work at the temperature of 400℃ ~500℃ and have good strength at high temperature. And its thermal stability is secondary to that of α titanium alloy.
The three titanium alloys are α titanium alloy and α+β titanium alloy; α titanium alloy has the best cutting and processing capacity, then α + β titanium alloy, and β titanium alloy is the last.
