What is the melting point of titanium alloy?

Titanium alloys have no fixed melting point. The melting point of pure titanium is1668 4℃, while the melting point of alloy is less than its single metal, so its melting point is less than1668 4℃.

Titanium is an allotrope isomer with a melting point of 1668℃, and a close-packed hexagonal lattice structure below 882℃, which is called α titanium; It has a body-centered cubic lattice structure above 882℃, which is called β titanium. Using the different characteristics of the above two structures of titanium and adding appropriate alloying elements, the phase transformation temperature and phase content of titanium are gradually changed to obtain titanium alloys with different structures.

At room temperature, titanium alloys have three matrix structures, which can be divided into the following three categories: α alloy, (α+β) alloy and β alloy. China is represented by TA, TC and TB respectively.

Titanium alloy still has high specific strength in the range of 150℃ ~ 500℃, and the working temperature can reach 500℃. Titanium alloy can still maintain its mechanical properties at low temperature and ultra-low temperature. Titanium alloys, such as TA7, which have good low temperature performance and extremely low interstitial elements, can still maintain certain plasticity at -253℃. Therefore, titanium alloy is also an important low-temperature structural material.

Extended data:

Types of titanium alloys

α titanium alloy

It is a single-phase alloy composed of α-phase solid solution, which is α-phase at normal temperature and high practical application temperature, with stable structure, higher wear resistance than pure titanium and strong oxidation resistance. At the temperature of 500℃ ~ 600℃, its strength and creep resistance remain unchanged, but it cannot be strengthened by heat treatment, and its room temperature strength is not high.

β titanium alloy

It is a single-phase alloy composed of β -phase solid solution, which has high strength without heat treatment. After quenching and aging, the alloy is further strengthened, and the room temperature strength can reach 1372 ~ 1666 MPa. However, it has poor thermal stability and is not suitable for use at high temperature.

α+β titanium alloy

It is a dual-phase alloy with good comprehensive properties, good organizational stability, good toughness, plasticity and high-temperature deformation properties, and can be well strengthened by hot pressing, quenching, aging and other processes. The strength after heat treatment is about 50% ~ 100% higher than that after annealing. It has high high temperature strength, can work at 400℃ ~ 500℃ for a long time, and its thermal stability is not as good as that of α titanium alloy.

Among the three titanium alloys, the most commonly used are α titanium alloy and α+β titanium alloy. The machinability of α titanium alloy is the best, followed by α+β titanium alloy and β titanium alloy is the worst. Alpha titanium alloy code TA, beta titanium alloy code TB, alpha+beta titanium alloy code TC.

Baidu encyclopedia-titanium alloy