Overview Titanium

Overview Titanium

Titanium is a 1950s era unfolded layout of an important metal, titanium because of its high strength, good corrosion resistance, heat resistance, and high-level features are widely used in various fields. Many countries recognize the importance of titanium alloy materials, have their research and development, and has been the practice to use.
Titanium is a useful first 1954 US successfully developed Ti-6Al-4V alloy, because of its heat resistance, strength, ductility, resistance, formability, weldability, corrosion resistance and biocompatibility are better, and become the main industry in titanium alloy, 75% to 85% of this amount accounted for all titanium alloys for use. Many others can be seen as a modification of titanium alloy Ti-6Al-4V alloy.
20th century, 50 to 60 times, first and foremost is to carry out high-temperature titanium aircraft engine and airframe layout of titanium, 70 age group declared an alloy corrosion, since age 80, corrosion resistant and high-strength titanium alloy has been further carried out. Temperature resistant titanium alloys using 50 times from 400 ℃ to 90 times the progress of 600 ~ 650 ℃. A2 (Ti3Al) and r (TiAl) based alloys exhibit, use titanium engine parts are driven by the engine cold side (fan and compressor) to the hot end of the engine (turbo) direction. Titanium layout to carry out high-strength, high plastic, high strength and high toughness, high modulus and high damage tolerance direction.
In addition, since the 20th century, 70 times, but also presents a Ti-Ni, Ti-Ni-Fe, Ti-Ni-Nb shape memory alloys, etc., and get increasingly widely used in engineering.
At present, the world has developed hundreds of titanium, the most famous of 20 to 30 kinds of alloys, such as Ti-6Al-4V, Ti-5Al-2.5Sn, Ti-2Al-2.5Zr, Ti-32Mo, Ti-Mo-Ni, Ti-Pd, SP-700, Ti-6242, Ti-10-5-3, Ti-1023, BT9, BT20, IMI829, IMI834 etc. [2,4].
Titanium is a titanium for sale alloy for the foundation to participate in other elements. There are two isomeric titanium crystal: The following 882 ℃ for hcp titanium layout α, β titanium above 882 ℃ for the body-centered cubic.
Alloying elements on the basis of their impact on the phase transition temperature can be divided into three categories:
① stable α-phase, progressive phase transition temperature of the elements is α secure element, aluminum, carbon, oxygen and nitrogen. During the primary alloying element aluminum is titanium, its alloys at room temperature the progress of high-temperature strength paper, reduce the proportion of added elastic modulus significant effect.
② stable β-phase, reducing the element of the phase transition temperature of β stable element, and can be divided isomorphic and eutectoid two.


The former has molybdenum, niobium, vanadium and the like; the latter are chromium, manganese, copper, iron, silicon and the like.
③ small element of the phase transition temperature is neutral elements, zirconium and tin.
Oxygen, nitrogen, carbon and hydrogen impurities is the primary titanium. Oxygen and nitrogen in the α phase has a greater solubility of titanium has significantly enhanced the role, but the plastic lower. General rules of oxygen and nitrogen content of titanium of 0.15 to 0.2%, respectively, and 0.04 to 0.05% or less. The solubility of hydrogen in α phase is very small, titanium dissolved in excess hydride hydrogen occurs, the alloy brittle. General titanium hydrogen content control in 0.015%. Hydrogen was dissolved in titanium is reversible, can be removed by vacuum annealing.