The difference between pure titanium and titanium alloy

The density of titanium is 4.5g/cm3, 57% of steel, titanium is less than two times heavier than aluminum, and its strength is three times larger than aluminum. When the ratio of strength to density is compared with that of different materials, the specific strength of titanium alloy is almost the largest in common industrial alloys. The specific strength of titanium alloy is 3.5 times that of stainless steel, 1.3 times of aluminum alloy and 1.7 times of magnesium alloy, so it is an essential structural material for aerospace industry. The comparison of the density and specific strength of titanium to other metals. Titanium has high melting point, poor thermal conductivity and electrical conductivity, similar to or slightly lower than stainless steel, titanium has superconductivity, and pure titanium has a superconducting critical temperature of 0.38.4K.  Metal titanium is a nonmagnetic material.
Titanium alloy is a phase solid solution composed of single phase alloy with small density, both in general temperature and in high practical application temperature, all of which are a phase, the microstructure is stable, the wear resistance is higher than pure titanium, and the anti oxidation ability is strong. At the temperature of 500-600 degrees, it still maintains its strength and creep resistance. It can be enhanced by heat treatment. It has good thermal strength and thermal stability, good welding performance and good performance at room temperature, ultra low temperature and high temperature.
Commercial pure titanium is a compact titanium metal with titanium content of not less than 99% and containing a small amount of impurities such as iron, carbon, oxygen, nitrogen and hydrogen. The most influential impurities in the mechanical properties of pure titanium are oxygen, nitrogen and iron, especially oxygen. The reaction of hydrogen to titanium is reversible, and the effect of hydrogen on titanium is mainly “hydrogen embrittlement”, which usually stipulates that the hydrogen content should not exceed 0.015%, which contains 0.15%-0.3% oxygen and 0.03%-0.05% nitrogen. The industrial pure titanium is a six square lattice at room temperature, but its axis is small (c/a=1.587). It has better processability. The molding and welding properties of pure titanium are good, and it is insensitive to heat treatment.