Titanium alloy is a titanium-based alloy by adding other elements

Titanium alloy is a titanium-based alloy by adding other elements. There are two isomeric titanium crystal:
Below 882 ℃ for α hcp titanium wire, more than 882 ℃ for the body-centered cubic β titanium.
Alloying elements according to their impact on the phase transition temperature can be divided into three categories:
① stable α phase, increase the phase transition temperature of the elements of α stabilizing element, aluminum, carbon, oxygen and nitrogen. Which is the main alloying elements aluminum alloy, improve its normal and high temperature strength of the alloy, reduce the proportion of the elastic modulus increases obviously.
② stable β-phase, reducing the element of the phase transition temperature of β stabilizing 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 are the major impurity titanium. Oxygen and nitrogen in the α phase has a greater solubility of titanium significant strengthening effect, but the plastic drop. Typically a predetermined content of oxygen and nitrogen in titanium 0.15 to 0.2% and 0.04% to 0.05% or less, respectively. The solubility of hydrogen in α phase is very small, titanium dissolved in excess hydride hydrogen will produce the alloy brittle. Titanium is usually hydrogen content control 0.015%. Hydrogen was dissolved in titanium sheet is reversible, can be removed by vacuum annealing.