The difference between pure titanium and titanium alloy
Pure titanium is a silvery-white metal. The obvious difference between pure titanium and titanium alloy is that titanium alloy is based on pure titanium, and chemical substances such as Al, Mo, Cr, Sn are added. It is due to the presence of these chemicals that the properties of the two titanium metals are different.
Titanium alloys refer to various alloy metals made of titanium and other metals. Titanium alloy has the advantages of high strength, good corrosion resistance and high heat resistance. Titanium alloys account for only 60% of steel. The strength of some high-strength titanium alloys exceeds that of many alloyed structural steels.
The difference between pure titanium and titanium alloy
1. The content of titanium is different: pure titanium is a silver-white metal, and titanium alloy refers to various alloy metals made of titanium and other metals.
2. Different density: the density of titanium is 4.54g/cm3, which is 43% lighter than steel, higher than aluminum, but lower than steel, copper, and nickel, and its specific strength ranks first among metals; the density of titanium alloy is usually 4.51g/cm3 About cm3, only 60% of the steel density;
3. Pure titanium is a silver-white metal with many excellent properties such as light weight, high strength, metallic luster, and resistance to wet chlorine corrosion. The density of titanium is lighter than that of steel, but its mechanical strength is similar to that of steel, twice that of aluminum and five times that of magnesium; titanium has high temperature resistance, and its melting point is 1942K, which is nearly 1000K higher than gold and 500K higher than steel;
Organization and elements of titanium alloy:
Titanium alloy is an alloy formed by adding titanium as the main component and adding other elements. Titanium has two homogeneous crystal structures: α-titanium with close-packed hexagonal structure below 882°C, and body-centered cubic β-titanium above 882°C.
Titanium alloying elements can be divided into three categories according to their influence on the phase transition temperature. The elements that stabilize the α phase and increase the phase transition temperature are α stable elements, including aluminum, carbon, oxygen, nitrogen, and the like. Among them, aluminum is the main alloying element of titanium alloy, which can significantly improve the room temperature and high temperature strength of the alloy, reduce the specific gravity, and increase the elastic modulus.
The elements that stabilize the β phase and lower the phase transition temperature are β stable elements, including molybdenum, niobium, vanadium, etc. The elements that have little effect on the phase transition temperature are neutral elements, such as zirconium and tin.
Uses of pure titanium:
The content of impurities has a great influence on the performance of titanium, and a small amount of impurities can significantly improve the strength of titanium. Therefore, the strength of industrial pure titanium is high, close to the level of high-strength aluminum alloy, and it is mainly used to manufacture petrochemical heat exchangers, reactors, ship parts, aircraft skins, etc. with low working temperature. Above 350°C. Pure titanium is increasingly used in jewelry making, jewellery, kitchenware and everyday items.
