What are the main components of titanium and titanium alloys

Titanium alloys are alloys based on titanium with other elements added. There are two kinds of homogenous crystals in titanium: α titanium with dense hexagonal structure is below 882℃, and β titanium with body center cube is above 882℃. The alloying elements can be divided into three categories according to their effect on phase transition temperature: ① α -stable elements, which increase phase transition temperature, are α -stable elements, including aluminum, carbon, oxygen and nitrogen. Aluminum is the main alloying element of titanium alloy, which has obvious effect on improving the strength of alloy at room temperature and high temperature, reducing the specific gravity and increasing the elastic modulus. (2) β -stable elements can be divided into two types: isocrystalline and eutectoid. The former has molybdenum, niobium, vanadium and so on; The latter has chromium, manganese, copper, iron, silicon and so on. (3) The elements that have little effect on phase transition temperature are neutral elements, such as zirconium and tin.

Titanium in the earth's crust, titanium reserves second only to iron, aluminum, magnesium, fourth. Because titanium has the characteristics of high melting point, small specific gravity, high specific strength, good toughness, fatigue resistance, corrosion resistance, low thermal conductivity, high and low temperature resistance, and low stress under the condition of rapid cooling and heat, its commercial value in the 1950s began to be recognized by people, was applied in aviation, aerospace and other high-tech fields.

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