Titanium-based alloying of other alloying elements is called titanium alloy. Titanium alloy has the advantages of low density, high specific strength, good corrosion resistance, good process performance and so on. It is an ideal aerospace engineering structural material.
Titanium alloy can be divided into structural titanium alloy and heat-resistant titanium alloy, or α-type titanium alloy, β-type titanium alloy and α + β-type titanium alloy. The scope of the study also includes titanium alloy forming technology, powder metallurgy technology, rapid solidification technology, titanium and other military and civilian
Titanium alloy is a new type of structural material, it has excellent comprehensive performance, such as the density is small (~ 4.5g cm-3), specific strength and toughness than the fracture toughness, fatigue strength and crack resistance, good, low temperature toughness, Corrosion performance, some of the maximum working temperature of titanium alloy 550 ~ C, is expected to reach 700 C. So it is in the aviation, aerospace, chemical, shipbuilding and other industrial sectors have been increasingly widely used, the rapid development. (Σ0.2 / density) of light alloy, steel and so on, the ratio of titanium alloy is stronger than that of other light metals, steel and nickel alloy, and this advantage can be maintained to about 500 ℃, so some titanium The alloy is suitable for the manufacture of gas turbine components. About 80% of titanium production is for the aerospace and aerospace industries. For example, the United States B-1 bomber body structure materials, titanium alloy accounts for about 21%, mainly for the manufacture of fuselage, wing, skin and bearing components. F-15 fighter body structure materials, titanium alloy dosage of 7000kg, Titanium about 34% of the weight of the structure. Boeing 757 aircraft structural parts, titanium alloy about 5%, the amount of 3640 kg. McDonnell-Dounlas (Mc-Donnell-Dounlas) produced DC10 aircraft, titanium alloy consumption of 5500kg, accounting for more than 10% of the weight of the structure. In the chemical and general engineering areas of titanium consumption: the United States accounted for about 15% of its production, Europe accounted for about 40%. Due to the excellent corrosion resistance of titanium and its alloys, good mechanical properties, and qualified tissue compatibility, it is used to make biological materials such as prostheses.
Titanium metal density is small, 4.5g / cm3, only 60% of iron, Titanium usually with aluminum, magnesium and so called light metal, the corresponding titanium alloy, aluminum alloy, magnesium alloy is called light alloy. Many countries in the world are aware of the importance of titanium alloy materials, titanium alloy materials have been research and development, and has been practical application. Titanium is an important structural metal developed in the 1950s. Titanium alloys have been widely used in various fields because of their high specific strength, good corrosion resistance, high heat resistance and easy welding. High strength, Titanium easy welding performance is conducive to the manufacture of golf club head.
The first practical titanium alloy is developed in 1954 in the United States Ti-6Al (aluminum) -4V (alum) alloy. Ti-6Al-4V alloy has good heat resistance, strength, plasticity, toughness, formability, weldability, corrosion resistance and biocompatibility. Ti-6Al-4V alloy used in all titanium alloy accounted for 75 ~ 85%. Many other alloys can be seen as Ti-6Al-4V alloy modification. At present, the world has developed hundreds of titanium alloy, the most famous alloy has twenty to thirty kinds, for example, Ti-6Al-4V </ SPAN>, Ti-5Al-2.5Sn, Ti-2Al Ti-102M, Ti-10-5-3, Ti-1100, BT9, BT20, IMI829, IMI834, etc., Ti-32Mo, Ti-Mo-Ni, Ti-Pd, Ti-811, Ti-6242 ; For the club manufacturing are 10-2-3, SP700, 15-3-3-3 (commonly referred to as β titanium), 22-4, DAT51.
Titanium alloy can be divided into α, α + β, β-type alloy and titanium aluminum intermetallic compounds (TixAl, where x = 1 or 3) four categories. The following table lists four typical titanium alloys and features.