Overview Of Titanium Alloy Physical Properties

Titanium is an allotropic isomer with a melting point of 1668°C. It has a dense hexagonal lattice structure below 882°C. It has a densely arranged hexagonal lattice structure, called α-titanium, below 882°C. Above 882°C, it has a body-centered cubic lattice structure, called β-titanium. Using the different characteristics of the above two structures of titanium, by adding appropriate alloying elements, gradually change the phase transition temperature and phase content, to obtain different microstructure of titanium alloys. At room temperature, titanium alloys have three types of matrix organization, and titanium alloys are classified into the following three types: α-alloys, (α+β) alloys and β-alloys. China is represented by TA, TC and TB respectively.

Alpha Titanium Alloy

It is a single-phase alloy composed of alpha-phase solid solution. It is alpha phase at room temperature or higher practical application temperature. It is structurally stable, has higher wear resistance than pure titanium, and has strong oxidation resistance. In 500 ℃ ~ 600 ℃ temperature can still maintain the strength and creep resistance, but heat treatment has not been strengthened, room temperature strength is not high.

β Titanium Alloy

It is a single-phase alloy composed of β-phase solid solution.

It has high strength without heat treatment. After quenching and aging treatment, the alloy is further strengthened. The room temperature strength can reach 1372~1666 MPa, but the thermal stability is poor, and it is not suitable for use at high temperatures.

α+β Titanium Alloy

It is a two-phase alloy with good comprehensive performance, good structural stability, good toughness, plasticity and high-temperature deformation properties. It can be well processed by hot pressure and the alloy can be strengthened by quenching and aging. The strength after heat treatment is about 50% to 100% higher than that of the annealed state; the high-temperature strength is high, and it can work for a long time at a temperature of 400℃ to 500℃, and the thermal stability is second to that of α titanium alloy.