Physical Properties of Titanium

① Density

The density of pure titanium at room temperature (25°C) is 4.505g/cm3, the density of titanium is about 57% of steel, 60% of copper, and 1.8 times of aluminum. It is 4.35g/cm3 at 870°C and 432g/cm3 at 900°C. With the addition of alloying elements in titanium, the density of titanium alloys also changes, and the range of variation is between 4.4 and 4.9g/cm3, β Alloys are generally heavier because of the addition of large amounts of heavier alloying elements such as molybdenum.

② melting point

The melting point of titanium is (1668±5)°C. The presence or addition of different alloying elements in titanium will change the melting temperature.

③Boiling point

The boiling point of titanium is (3260±20)°C.

④ specific heat capacity

The specific heat capacity of titanium at 20°C is 500J/(kg K). As the temperature increases, the specific heat capacity of titanium increases. At 882°C, there is a sudden change in the specific heat capacity due to the a/β transition.

⑤ Coefficient of thermal expansion

The thermal expansion coefficient of titanium is significantly lower than that of aluminum and steel, which is 7.6×10-6 1/K.

⑥Thermal conductivity

The thermal conductivity of titanium is very low, which is 17W/(m K), which is similar to that of 18-8 stainless steel, which leads to a large temperature difference along the section when titanium is heated in ingots and blanks, and when titanium structures are welded. This results in greater local stress.

⑦Resistivity

The resistivity of titanium is 0.48μQ·m, and the resistance of titanium is quite high.

⑧ Magnetic susceptibility

The magnetic susceptibility coefficient of titanium is 3.4×10-6, and titanium is non-magnetic.

⑨Elastic modulus

The elastic modulus of titanium is generally 103-110GPa, which is half of that of steel materials, and it is easy to bend.